CHƯƠNG 11. THIẾT KẾ TRẮC NGANG
11.2 TÍNH TOÁN RÃNH BIÊN
11.2.4 K t quả tính toán rãnh
Các giá trị bề rộng lưu vực Blv được xác định trong trắc ngang thiết kế sơ bộ tương ứng với cao độ thi công rãnh (có xét đến mở rộng đảm bảo tầm nhìn).
Cao độ thi công htc được tính toán là giá trị tối thiểu. Khi bố trí rãnh biên trên trắc dọc và trắc ngang, thường tại một số vị trí (đỉnh đường cong đứng, gần cống…) cần phải hiệu chỉnh nhằm đảm bảo độ dốc tối thiểu, đồng thời vẫn thỏa giá trị tính toán.
Lưu lượng của rãnh biên xem như bằng giá trị đo chiều sâu thiết kế sơ bộ (do xét đến Bstb có bề rộng khá an toàn).
Xác định các thông số rãnh
-Chiều dài : Lrãnh = LTi – LTi+1
-Độ dốc rãnh : ir = (Hđáy rãnhi – Hđáy rãnhi+1) /Lrãnh -Chiều cao thi công rãnh : htc = max(hrtt+0.2 ; 0.3) 11.2.4.1 Thiết kế sơ bộ chiều sâu rãnh trái
Bảng 11.8 Thiết kế sơ bộ chiều cao rãnh trái chưa xét đến tính toán thủy lực
Tên cọc Lr
(m)
hr
(m)
CĐ đáy rãnh
(m)
ir
(%)
CĐ đáy rãnh hc
(m)
ir_hc
(%)
hr_hc
(m)
C58 300.00 0.30 30.84 3.57 0.30
X3 287.64 0.30 31.28 3.57 0.30
C59 280.00 0.30 31.50 2.94 0.30
DC4 276.75 0.30 31.61 3.40 0.30
C60 260.00 0.30 32.10 2.89 0.30
ND3 241.46 0.30 32.33 1.24 0.30
C61 240.00 0.30 32.35 1.58 0.30
C62 220.00 0.30 32.67 1.58 0.30
C63 200.00 0.30 32.99 1.58 0.30
C64 180.00 0.30 33.30 1.58 0.30
TD3 171.46 0.30 33.35 0.56 0.30
C65 160.00 0.30 33.48 1.13 0.30
C66 140.00 0.30 33.78 1.50 0.30
C67 120.00 0.30 34.07 1.45 0.30
P3 104.70 0.30 34.30 1.50 0.30
C68 100.00 0.30 34.37 1.49 0.30
C69 80.00 0.30 34.65 1.40 0.30
C70 60.00 0.30 34.86 1.05 0.30
DD5 60.00 0.30 34.86 1.05 0.30
C71 40.00 0.30 35.11 1.25 0.30
TC3 37.94 0.30 35.15 1.94 0.30
C72 20.00 0.30 35.34 1.06 0.30
C73 0.00 0.30 35.48 0.70 35.48 0.70 0.30
C74 20.00 0.30 35.45 -0.15 35.38 -0.50 0.37
PG5 20.65 0.30 35.45 -0.34 35.38 -0.50 0.37
NC3 32.06 0.30 35.40 -0.45 35.32 -0.50 0.38
D5 40.00 0.30 35.37 -0.29 35.28 -0.50 0.39
C75 40.00 0.30 35.37 -0.29 35.28 -0.50 0.39
ND4 46.10 0.30 35.35 -0.41 35.25 -0.50 0.40
C76 60.00 0.30 35.30 -0.31 35.18 -0.50 0.42
C77 80.00 0.30 35.18 -0.62 35.08 -0.50 0.40
C78 100.00 0.30 34.98 -0.99 34.98 -0.50 0.30
TD4 116.10 0.30 34.77 -1.32 0.30
C79 120.00 0.30 34.70 -1.79 0.30
C80 140.00 0.30 34.30 -2.01 0.30
DC5 140.00 0.30 34.30 -2.01 0.30
C81 160.00 0.30 33.86 -2.19 0.30
C82 180.00 0.30 33.42 -2.19 0.30
P4 183.49 0.30 33.34 -2.19 0.30
C83 200.00 0.30 32.98 -2.19 0.30
C84 220.00 0.30 32.54 -2.19 0.30
DD6 236.67 0.30 32.18 -2.19 0.30
C85 240.00 0.30 32.10 -2.17 0.30
TC4 250.87 0.30 31.85 -2.31 0.30
C86 260.00 0.30 31.42 -4.77 0.30
X4 274.05 0.30 30.75 -4.74 0.30
C87 280.00 0.30 30.43 -5.42 0.30
NC5 54.24 0.30 30.02 3.90 0.30
C103 40.00 0.30 30.57 3.90 0.30
X5 38.13 0.30 30.68 5.64 0.30
DC7 36.56 0.30 30.69 0.71 0.30
C104 20.00 0.30 31.35 3.98 0.30
C105 0.00 0.30 31.68 1.64 0.30
11.2.4.2 Tính lặp lần 1 giá trị htt từ chiều cao rãnh trái sơ bộ đã hiệu chỉnh Bảng 11.9 Lưu lượng tính toán sơ bộ của rãnh biên trái
Tên
cọc Lý trình Cự ly lẻ (m)
Btr
(m)
Ktr
(m)
BTLtr
(m)
Bstb
(m)
BLVtr
(m) Fi
(m2)
Qtti
(m3/s) Qtt
(m3/s) C58 Km 1 + 160.00 20.00 4.5 1.00 1.13 0.00 6.63 132.5 0.0025 0.0187 X3 Km 1 + 172.36 12.36 4.5 1.00 0.71 0.00 6.21 76.7 0.0015 0.0162 C59 Km 1 + 180.00 7.64 4.5 1.00 0.47 0.00 5.97 45.6 0.0009 0.0147 DC4 Km 1 + 183.25 3.25 4.5 1.00 0.36 0.00 5.86 19.1 0.0004 0.0138
ND3 Km 1 + 218.54 18.54 4.5 1.00 0.20 0.00 5.70 105.6 0.0020 0.0117 C61 Km 1 + 220.00 1.46 4.5 1.00 0.18 0.00 5.68 8.3 0.0002 0.0097 C62 Km 1 + 240.00 20.00 4.5 1.00 0.16 0.00 5.66 113.2 0.0021 0.0096 C63 Km 1 + 260.00 20.00 0.5 1.00 0.50 0.00 2.00 40.0 0.0008 0.0074 C64 Km 1 + 280.00 20.00 0.5 1.00 0.40 0.00 1.90 38.0 0.0007 0.0067 TD3 Km 1 + 288.54 8.54 0.5 1.00 0.28 0.00 1.78 15.2 0.0003 0.0059 C65 Km 1 + 300.00 11.46 0.5 1.00 0.31 0.00 1.81 20.8 0.0004 0.0057 C66 Km 1 + 320.00 20.00 0.5 1.00 0.24 0.00 1.74 34.9 0.0007 0.0053 C67 Km 1 + 340.00 20.00 0.5 1.00 0.25 0.00 1.75 35.0 0.0007 0.0046 P3 Km 1 + 355.30 15.30 0.5 1.00 0.22 0.00 1.72 26.3 0.0005 0.0039 C68 Km 1 + 360.00 4.70 0.5 1.00 0.26 0.00 1.76 8.3 0.0002 0.0034 C69 Km 1 + 380.00 20.00 0.5 1.00 0.18 0.00 1.68 33.5 0.0006 0.0033 C70 Km 1 + 400.00 20.00 0.5 1.00 0.17 0.00 1.67 33.5 0.0006 0.0026 DD5 Km 1 + 400.00 0.00 0.5 1.00 0.17 0.00 1.67 0.0 0.0000 0.0020 C71 Km 1 + 420.00 20.00 0.5 1.00 0.14 0.00 1.64 32.7 0.0006 0.0020 TC3 Km 1 + 422.06 2.06 0.5 1.00 0.19 0.00 1.69 3.5 0.0001 0.0014 C72 Km 1 + 440.00 17.94 0.5 1.00 0.28 0.00 1.78 31.9 0.0006 0.0013 C73 Km 1 + 460.00 20.00 0.5 1.00 0.42 0.00 1.92 38.4 0.0007 0.0007 C74 Km 1 + 480.00 20.00 4.5 1.14 0.24 0.00 5.87 117.5 0.0022 0.0030 PG5 Km 1 + 480.65 0.65 4.5 1.14 0.24 0.00 5.88 3.8 0.0001 0.0030 NC3 Km 1 + 492.06 11.41 4.5 1.15 0.36 0.00 6.02 68.7 0.0013 0.0043 D5 Km 1 + 500.00 7.94 4.5 1.19 0.41 0.00 6.09 48.4 0.0009 0.0052 C75 Km 1 + 500.00 0.00 4.5 1.19 0.41 0.00 6.09 0.0 0.0000 0.0052 ND4 Km 1 + 506.10 6.10 4.5 1.20 0.43 0.00 6.13 37.4 0.0007 0.0059 C76 Km 1 + 520.00 13.90 4.5 1.25 0.46 0.00 6.21 86.3 0.0016 0.0076 C77 Km 1 + 540.00 20.00 0.5 1.20 0.67 0.00 2.37 47.3 0.0009 0.0085 C78 Km 1 + 560.00 20.00 0.5 1.00 0.59 0.00 2.10 41.9 0.0008 0.0093 TD4 Km 1 + 576.10 16.10 0.5 1.00 0.64 0.00 2.14 34.4 0.0007 0.0099 C79 Km 1 + 580.00 3.90 0.5 1.00 0.61 0.00 2.11 8.2 0.0002 0.0101 C80 Km 1 + 600.00 20.00 0.5 1.00 0.83 0.00 2.33 46.7 0.0009 0.0110 DC5 Km 1 + 600.00 0.00 0.5 1.00 0.85 0.00 2.35 0.0 0.0000 0.0110 C81 Km 1 + 620.00 20.00 0.5 1.00 1.33 0.00 2.83 56.5 0.0011 0.0120 C82 Km 1 + 640.00 20.00 0.5 1.00 1.63 0.00 3.13 62.6 0.0012 0.0132 P4 Km 1 + 643.49 3.49 0.5 1.00 1.61 0.00 3.11 10.8 0.0002 0.0134 C83 Km 1 + 660.00 16.51 0.5 1.00 1.42 0.00 2.92 48.2 0.0009 0.0143 C84 Km 1 + 680.00 20.00 0.5 1.00 1.07 0.00 2.57 51.5 0.0010 0.0153 DD6 Km 1 + 696.67 16.67 0.5 1.00 0.69 0.00 2.19 36.5 0.0007 0.0160 C85 Km 1 + 700.00 3.33 0.5 1.00 0.66 0.00 2.16 7.2 0.0001 0.0161 TC4 Km 1 + 710.87 10.87 0.5 1.00 0.33 0.00 1.83 19.9 0.0004 0.0165 C86 Km 1 + 720.00 9.13 0.5 1.00 0.15 0.00 1.65 15.1 0.0003 0.0168 X4 Km 1 + 734.05 14.05 0.5 1.00 1.04 0.00 2.54 35.7 0.0007 0.0175 C87 Km 1 + 740.00 5.95 0.5 1.00 1.22 0.00 2.72 16.2 0.0003 0.0178 NC5 Km 2 + 45.76 5.76 4.5 1.00 1.32 0.00 6.82 39.3 0.0007 0.0067 C103 Km 2 + 60.00 14.24 4.5 1.00 0.76 0.00 6.26 89.2 0.0017 0.0060
X5 Km 2 + 61.87 1.87 4.5 1.00 0.71 0.00 6.21 11.6 0.0002 0.0043 DC7 Km 2 + 63.44 1.57 4.5 1.00 0.67 0.00 6.17 9.7 0.0002 0.0041 C104 Km 2 + 80.00 16.56 4.5 1.00 0.02 0.00 5.52 91.4 0.0017 0.0039 C105 Km 2 + 100.00 20.00 4.5 1.00 0.16 0.00 5.66 113.1 0.0021 0.0021
Bảng 11.10 Chiều cao rãnh trái xác định từ lưu lượng sơ bộ
Tên
cọc Lý trình Qtt
(m3/s) br
(m) n ir
(%)
hrtt
(m)
Q'tt
(m3/s) ΔQ (%)
hr_hc
(m) C58 Km 1 + 160.00 0.0187 0.4 0.020 3.57 0.041 0.0187 0.04 0.30 X3 Km 1 + 172.36 0.0162 0.4 0.020 3.57 0.038 0.0162 0.38 0.30 C59 Km 1 + 180.00 0.0147 0.4 0.025 2.94 0.044 0.0148 0.42 0.30 DC4 Km 1 + 183.25 0.0138 0.4 0.020 3.40 0.035 0.0139 0.45 0.30 C60 Km 1 + 200.00 0.0135 0.4 0.025 2.89 0.042 0.0135 0.46 0.30 ND3 Km 1 + 218.54 0.0117 0.4 0.030 1.24 0.055 0.0118 0.53 0.30 C61 Km 1 + 220.00 0.0097 0.4 0.030 1.58 0.046 0.0098 0.64 0.30 C62 Km 1 + 240.00 0.0096 0.4 0.030 1.58 0.045 0.0096 0.65 0.30 C63 Km 1 + 260.00 0.0074 0.4 0.030 1.58 0.039 0.0075 0.83 0.30 C64 Km 1 + 280.00 0.0067 0.4 0.030 1.58 0.037 0.0067 0.93 0.30 TD3 Km 1 + 288.54 0.0059 0.4 0.030 0.56 0.046 0.0059 0.10 0.30 C65 Km 1 + 300.00 0.0057 0.4 0.030 1.13 0.036 0.0057 0.00 0.30 C66 Km 1 + 320.00 0.0053 0.4 0.030 1.50 0.032 0.0053 0.00 0.30 C67 Km 1 + 340.00 0.0046 0.4 0.030 1.45 0.030 0.0046 0.48 0.30 P3 Km 1 + 355.30 0.0039 0.4 0.030 1.50 0.027 0.0039 0.00 0.30 C68 Km 1 + 360.00 0.0034 0.4 0.030 1.49 0.025 0.0034 0.00 0.30 C69 Km 1 + 380.00 0.0033 0.4 0.030 1.40 0.025 0.0033 0.00 0.30 C70 Km 1 + 400.00 0.0026 0.4 0.030 1.05 0.024 0.0026 0.00 0.30 DD5 Km 1 + 400.00 0.0020 0.4 0.030 1.05 0.020 0.0020 0.00 0.30 C71 Km 1 + 420.00 0.0020 0.4 0.030 1.25 0.019 0.0020 0.00 0.30 TC3 Km 1 + 422.06 0.0014 0.4 0.030 1.94 0.013 0.0014 0.00 0.30 C72 Km 1 + 440.00 0.0013 0.4 0.030 1.06 0.016 0.0013 0.00 0.30 C73 Km 1 + 460.00 0.0007 0.4 0.030 0.70 0.012 0.0007 0.00 0.30 C74 Km 1 + 480.00 0.0030 0.4 0.030 -0.50 0.031 0.0029 0.76 0.37 PG5 Km 1 + 480.65 0.0030 0.4 0.030 -0.50 0.032 0.0030 0.16 0.37 NC3 Km 1 + 492.06 0.0043 0.4 0.030 -0.50 0.040 0.0043 0.00 0.38 D5 Km 1 + 500.00 0.0052 0.4 0.030 -0.50 0.045 0.0053 0.66 0.39 C75 Km 1 + 500.00 0.0052 0.4 0.030 -0.50 0.045 0.0052 0.18 0.39 ND4 Km 1 + 506.10 0.0059 0.4 0.030 -0.50 0.048 0.0059 0.00 0.40 C76 Km 1 + 520.00 0.0076 0.4 0.030 -0.50 0.056 0.0076 0.67 0.42 C77 Km 1 + 540.00 0.0085 0.4 0.030 -0.50 0.059 0.0085 0.01 0.40 C78 Km 1 + 560.00 0.0093 0.4 0.030 -0.50 0.063 0.0093 0.00 0.30 TD4 Km 1 + 576.10 0.0099 0.4 0.030 -1.31 0.049 0.0099 0.18 0.30 C79 Km 1 + 580.00 0.0101 0.4 0.030 -1.79 0.045 0.0101 0.00 0.30 C80 Km 1 + 600.00 0.0110 0.4 0.025 -2.01 0.041 0.0110 0.06 0.30
C81 Km 1 + 620.00 0.0120 0.4 0.025 -2.19 0.042 0.0120 0.00 0.30 C82 Km 1 + 640.00 0.0132 0.4 0.025 -2.19 0.045 0.0132 0.06 0.30 P4 Km 1 + 643.49 0.0134 0.4 0.025 -2.19 0.045 0.0134 0.18 0.30 C83 Km 1 + 660.00 0.0143 0.4 0.025 -2.19 0.047 0.0144 0.19 0.30 C84 Km 1 + 680.00 0.0153 0.4 0.025 -2.19 0.049 0.0153 0.10 0.30 DD6 Km 1 + 696.67 0.0160 0.4 0.025 -2.19 0.050 0.0160 0.07 0.30 C85 Km 1 + 700.00 0.0161 0.4 0.025 -2.17 0.050 0.0161 0.07 0.30 TC4 Km 1 + 710.87 0.0165 0.4 0.025 -2.31 0.050 0.0165 0.00 0.30 C86 Km 1 + 720.00 0.0168 0.4 0.020 -4.77 0.036 0.0168 0.00 0.30 X4 Km 1 + 734.05 0.0175 0.4 0.020 -4.74 0.037 0.0174 0.50 0.30 C87 Km 1 + 740.00 0.0178 0.4 0.014 -5.42 0.029 0.0177 0.68 0.30 NC5 Km 2 + 45.76 0.0067 0.4 0.020 3.90 0.022 0.0067 0.04 0.30 C103 Km 2 + 60.00 0.0060 0.4 0.020 3.90 0.020 0.0060 0.00 0.30 X5 Km 2 + 61.87 0.0043 0.4 0.014 5.64 0.012 0.0043 0.00 0.30 DC7 Km 2 + 63.44 0.0041 0.4 0.030 0.71 0.034 0.0041 0.00 0.30 C104 Km 2 + 80.00 0.0039 0.4 0.020 3.98 0.016 0.0039 0.17 0.30 C105 Km 2 + 100.00 0.0021 0.4 0.030 1.64 0.018 0.0021 0.00 0.30
Tất cả các mặt cắt ta đều có htc nhỏ hơn hoặc bằng chiều sâu rãnh sơ bộ hiệu chỉnh nên không cần tính toán bước lặp lần 2.
Vì thế, lựa chọn chiều cao rãnh sơ bộ đã hiệu chỉnh bên trái làm chiều cao rãnh để thiết kế.
11.2.4.3 Tính toán rãnh biên phải
Bảng 11.11 Thiết kế sơ bộ chiều cao rãnh chưa xét đến tính toán thủy lực
Tên cọc Lr
(m)
hr
(m)
CĐ đáy rãnh
(m)
ir
(%)
CĐ đáy rãnh hc
(m)
ir_hc
(%)
hr_hc
(m)
C55 380.65 0.30 30.11 3.02 0.30
D4 372.40 0.30 30.36 3.02 0.30
C56 360.65 0.30 30.64 2.46 0.30
C57 340.65 0.30 31.27 3.15 0.30
C58 320.65 0.30 31.62 1.76 0.30
X3 308.29 0.30 31.79 1.34 0.30
C59 300.65 0.30 31.85 0.80 0.30
DC4 297.40 0.30 31.89 1.23 0.30
C60 280.65 0.30 32.10 1.24 0.30
ND3 262.11 0.30 32.33 1.24 0.30
C61 260.65 0.30 32.35 1.24 0.30
C62 240.65 0.30 32.60 1.24 0.30
C63 220.65 0.30 32.84 1.24 0.30
C64 200.65 0.30 33.04 0.99 0.30
TD3 192.11 0.30 33.12 0.90 0.30
C65 180.65 0.30 33.26 1.24 0.30
C66 160.65 0.30 33.56 1.48 0.30
C67 140.65 0.30 33.85 1.48 0.30
P3 125.35 0.30 34.08 1.48 0.30
C68 120.65 0.30 34.15 1.47 0.30
C69 100.65 0.30 34.44 1.48 0.30
C70 80.65 0.30 34.74 1.48 0.30
DD5 80.65 0.30 34.74 1.48 0.30
C71 60.65 0.30 34.99 1.29 0.30
TC3 58.59 0.30 35.02 1.09 0.30
C72 40.65 0.30 35.24 1.25 35.20 1.05 0.33
C73 20.65 0.30 35.37 0.65 35.30 0.50 0.37
C74 0.65 0.30 35.41 0.19 35.40 0.50 0.30
PG5 0.00 0.30 35.41 0.00 35.41 0.50 0.30
NC3 11.41 0.30 35.40 -0.11 35.35 -0.50 0.34
D5 19.35 0.30 35.37 -0.29 35.31 -0.50 0.36
C75 19.35 0.30 35.37 -0.29 35.31 -0.50 0.36
ND4 25.45 0.30 35.35 -0.41 35.28 -0.50 0.37
C76 39.35 0.30 35.26 -0.60 35.21 -0.50 0.35
C77 59.35 0.30 35.08 -0.91 0.30
C78 79.35 0.30 34.83 -1.28 0.30
TD4 95.45 0.30 34.53 -1.86 0.30
C79 99.35 0.30 34.46 -1.79 0.30
C80 119.35 0.30 34.06 -2.01 0.30
DC5 119.35 0.30 34.06 -2.01 0.30
C81 139.35 0.30 33.62 -2.19 0.30
C82 159.35 0.30 33.18 -2.19 0.30
P4 162.84 0.30 33.10 -2.19 0.30
C83 179.35 0.30 32.74 -2.19 0.30
C84 199.35 0.30 32.30 -2.19 0.30
DD6 216.02 0.30 31.94 -2.19 0.30
C85 219.35 0.30 31.86 -2.17 0.30
TC4 230.22 0.30 31.64 -2.07 0.30
C86 239.35 0.30 31.49 -1.63 0.30
X4 253.40 0.30 31.79 2.15 0.30
C87 259.35 0.30 31.50 -4.91 0.30
C88 279.35 0.30 30.59 -4.53 0.30
D6 291.02 0.30 30.14 -3.88 0.30
C89 299.35 0.30 29.96 -2.22 0.30
NC4 300.22 0.30 29.954 -0.13 29.951 -0.50 0.303
C90 319.35 0.30 29.67 -1.48 0.30
ND5 325.13 0.30 29.58 -1.54 0.30
C91 339.35 0.30 29.48 -0.68 0.30
C92 359.35 0.30 29.39 -0.47 29.38 -0.50 0.31
DC6 366.02 0.30 29.39 -0.01 29.35 -0.50 0.34
C93 379.35 0.30 29.30 -0.65 29.28 -0.50 0.32
C94 399.35 0.30 29.04 -1.30 0.30
TD5 405.13 0.30 28.96 -1.50 0.30
C95 419.35 0.30 28.61 -2.45 0.30
C96 439.35 0.30 28.26 -1.74 0.30
P5 445.12 0.30 28.17 -1.51 0.30
CONG 3 445.69 0.30 28.17 0.00 28.17 -0.50 0.30
C97 160.00 0.30 28.17 0.00 28.10 -0.50 0.37
DD7 156.56 0.30 28.17 0.00 28.09 -0.50 0.39
C98 140.00 0.30 28.44 1.59 0.30
TC5 134.24 0.30 28.53 1.54 0.30
C99 120.00 0.30 28.97 3.10 0.30
C100 100.00 0.30 29.59 3.11 0.30
D7 96.56 0.30 29.68 2.65 0.30
C101 80.00 0.30 30.20 3.13 0.30
C102 60.00 0.30 30.87 3.37 0.30
NC5 54.24 0.30 30.94 1.16 0.30
C103 40.00 0.30 31.12 1.28 0.30
X5 38.13 0.30 31.19 3.75 0.30
DC7 36.56 0.30 31.17 -1.53 0.30
C104 20.00 0.30 31.40 1.39 0.30
C105 0.00 0.30 31.68 1.39 0.30
11.2.4.4 Tính lặp lần 1 giá trị htt từ chiều cao rãnh phải sơ bộ đã hiệu chỉnh Bảng 11.12 Lưu lượng tính toán sơ bộ của rãnh biên phải
Tên cọc Lý trình
Cự ly lẻ (m)
Bph
(m)
Kph
(m)
BTLph
(m)
Bstb
(m)
BLVph
(m) Fi
(m2)
Qtti
(m3/s) Qtt
(m3/s) C55 Km 1 + 100.00 0.00 4.5 1.00 1.669 5.00 12.17 0.00 0.0000 0.1446 D4 Km 1 + 108.25 8.25 4.5 1.00 1.385 5.00 11.88 98.06 0.0019 0.1446 C56 Km 1 + 120.00 11.75 4.5 1.00 1.052 5.00 11.55 135.73 0.0026 0.1427 C57 Km 1 + 140.00 20.00 4.5 1.00 0.120 5.00 10.62 212.40 0.0040 0.1402 C58 Km 1 + 160.00 20.00 4.5 1.00 0.400 5.00 10.90 218.00 0.0041 0.1362 X3 Km 1 + 172.36 12.36 4.5 1.00 0.60 5.00 11.10 137.15 0.0026 0.1320 C59 Km 1 + 180.00 7.64 4.5 1.00 0.89 5.00 11.39 87.05 0.0016 0.1294 DC4 Km 1 + 183.25 3.25 4.5 1.00 0.16 5.00 10.66 34.66 0.0007 0.1278 C60 Km 1 + 200.00 16.75 4.5 1.00 2.18 5.00 12.68 212.32 0.0040 0.1271 ND3 Km 1 + 218.54 18.54 4.5 1.00 4.24 5.00 14.74 273.19 0.0052 0.1231 C61 Km 1 + 220.00 1.46 4.5 1.00 4.37 5.00 14.87 21.76 0.0004 0.1179 C62 Km 1 + 240.00 20.00 4.5 1.00 6.57 5.00 17.07 341.36 0.0065 0.1175
C63 Km 1 + 260.00 20.00 8.5 1.00 8.76 5.00 23.26 465.12 0.0088 0.1111 C64 Km 1 + 280.00 20.00 8.5 1.00 10.86 5.00 25.36 507.22 0.0096 0.1023 TD3 Km 1 + 288.54 8.54 8.5 1.00 11.67 5.00 26.17 223.42 0.0042 0.0927 C65 Km 1 + 300.00 11.46 8.5 1.00 11.73 5.00 26.23 300.72 0.0057 0.0884 C66 Km 1 + 320.00 20.00 8.5 1.00 11.63 5.00 26.13 522.57 0.0099 0.0827 C67 Km 1 + 340.00 20.00 8.5 1.00 11.63 5.00 26.13 522.69 0.0099 0.0729 P3 Km 1 + 355.30 15.30 8.5 1.00 11.61 5.00 26.11 399.40 0.0076 0.0630 C68 Km 1 + 360.00 4.70 8.5 1.00 11.30 5.00 25.80 121.26 0.0023 0.0554 C69 Km 1 + 380.00 20.00 8.5 1.00 11.53 5.00 26.03 520.69 0.0099 0.0531 C70 Km 1 + 400.00 20.00 8.5 1.00 11.54 5.00 26.04 520.80 0.0099 0.0432 DD5 Km 1 + 400.00 0.00 8.5 1.00 11.54 5.00 26.04 0.00 0.0000 0.0334 C71 Km 1 + 420.00 20.00 8.5 1.00 11.48 5.00 25.98 519.50 0.0098 0.0334 TC3 Km 1 + 422.06 2.06 8.5 1.00 11.06 5.00 25.56 52.69 0.0010 0.0236 C72 Km 1 + 440.00 17.94 8.5 1.07 9.15 5.00 23.72 425.51 0.0081 0.0226 C73 Km 1 + 460.00 20.00 8.5 1.13 7.12 5.00 21.75 434.93 0.0082 0.0145 C74 Km 1 + 480.00 20.00 4.5 1.01 5.54 5.00 16.05 320.96 0.0061 0.0063 PG5 Km 1 + 480.65 0.65 4.5 1.00 5.48 5.00 15.98 10.39 0.0002 0.0002 NC3 Km 1 + 492.06 11.41 4.5 1.09 4.30 5.00 14.89 169.88 0.0032 0.0034 D5 Km 1 + 500.00 7.94 4.5 1.12 3.39 5.00 14.01 111.23 0.0021 0.0055 C75 Km 1 + 500.00 0.00 4.5 1.12 3.39 5.00 14.01 0.00 0.0000 0.0055 ND4 Km 1 + 506.10 6.10 4.5 1.13 3.00 5.00 13.63 83.17 0.0016 0.0071 C76 Km 1 + 520.00 13.90 4.5 1.11 4.17 5.00 14.77 205.33 0.0039 0.0110 C77 Km 1 + 540.00 20.00 8.5 1.00 5.87 5.00 20.37 407.34 0.0077 0.0187 C78 Km 1 + 560.00 20.00 8.5 1.00 7.54 5.00 22.04 440.85 0.0083 0.0270 TD4 Km 1 + 576.10 16.10 8.5 1.00 9.11 5.00 23.61 380.21 0.0072 0.0342 C79 Km 1 + 580.00 3.90 8.5 1.00 9.12 5.00 23.62 92.11 0.0017 0.0360 C80 Km 1 + 600.00 20.00 8.5 1.00 9.42 5.00 23.92 478.46 0.0091 0.0450 DC5 Km 1 + 600.00 0.00 8.5 1.00 9.32 5.00 23.82 0.00 0.0000 0.0450 C81 Km 1 + 620.00 20.00 8.5 1.00 9.92 5.00 24.42 488.36 0.0092 0.0543 C82 Km 1 + 640.00 20.00 8.5 1.00 10.29 5.00 24.79 495.89 0.0094 0.0637 P4 Km 1 + 643.49 3.49 8.5 1.00 10.27 5.00 24.77 86.37 0.0016 0.0653 C83 Km 1 + 660.00 16.51 8.5 1.00 10.12 5.00 24.62 406.46 0.0077 0.0730 C84 Km 1 + 680.00 20.00 8.5 1.00 9.60 5.00 24.10 482.05 0.0091 0.0821 DD6 Km 1 + 696.67 16.67 8.5 1.00 9.12 5.00 23.62 393.77 0.0075 0.0896 C85 Km 1 + 700.00 3.33 8.5 1.00 9.09 5.00 23.59 78.53 0.0015 0.0911 TC4 Km 1 + 710.87 10.87 8.5 1.00 8.67 5.00 23.17 251.97 0.0048 0.0958 C86 Km 1 + 720.00 9.13 8.5 1.00 7.69 5.00 22.19 202.52 0.0038 0.0997 X4 Km 1 + 734.05 14.05 8.5 1.00 5.56 5.00 20.06 281.89 0.0053 0.1050 C87 Km 1 + 740.00 5.95 8.5 1.00 0.540 5.00 15.04 89.45 0.0017 0.1067 C88 Km 1 + 760.00 20.00 4.5 1.00 0.541 5.00 11.04 220.81 0.0042 0.1109 D6 Km 1 + 771.67 11.67 4.5 1.00 1.013 5.00 11.51 134.37 0.0025 0.1134 C89 Km 1 + 780.00 8.33 4.5 1.00 1.161 5.00 11.66 97.13 0.0018 0.1152 NC4 Km 1 + 780.87 0.87 4.5 1.01 1.151 5.00 11.66 10.19 0.0002 0.1154 C90 Km 1 + 800.00 19.13 4.5 1.00 1.384 5.00 11.88 227.30 0.0043 0.1197
ND5 Km 1 + 805.78 5.78 4.5 1.00 1.418 5.00 11.92 68.89 0.0013 0.1210 C91 Km 1 + 820.00 14.22 4.5 1.00 1.457 5.00 11.96 170.03 0.0032 0.1243 C92 Km 1 + 840.00 20.00 4.5 1.01 1.526 5.00 12.04 240.78 0.0046 0.1288 DC6 Km 1 + 846.67 6.67 8.5 1.08 1.529 5.00 16.11 107.46 0.0020 0.1309 C93 Km 1 + 860.00 13.33 8.5 1.04 1.655 5.00 16.19 215.84 0.0041 0.1349 C94 Km 1 + 880.00 20.00 8.5 1.00 2.042 5.00 16.54 330.83 0.0063 0.1412 TD5 Km 1 + 885.78 5.78 8.5 1.00 2.172 5.00 16.67 96.36 0.0018 0.1430 C95 Km 1 + 900.00 14.22 8.5 1.00 2.694 5.00 17.19 244.50 0.0046 0.1477 C96 Km 1 + 920.00 20.00 8.5 1.00 3.215 5.00 17.72 354.31 0.0067 0.1544 P5 Km 1 + 925.77 5.77 8.5 1.00 3.346 5.00 17.85 102.94 0.0019 0.1563 CONG 3 Km 1 + 926.34 0.57 8.5 1.01 3.347 5.00 17.85 10.24 0.0002 0.1565 C97 Km 1 + 940.00 13.66 8.5 1.14 3.362 5.00 18.00 245.90 0.0047 0.0454 DD7 Km 1 + 943.44 3.44 8.5 1.18 3.366 5.00 18.04 62.07 0.0012 0.0408 C98 Km 1 + 960.00 16.56 8.5 1.00 2.975 5.00 17.48 289.39 0.0055 0.0396 TC5 Km 1 + 965.76 5.76 8.5 1.00 2.862 5.00 17.36 99.96 0.0019 0.0341 C99 Km 1 + 980.00 14.24 8.5 1.00 2.273 5.00 16.77 238.90 0.0045 0.0322 C100 Km 2 + 0.00 20.00 8.5 1.00 1.501 5.00 16.00 320.02 0.0061 0.0277 D7 Km 2 + 3.44 3.44 8.5 1.00 1.376 5.00 15.88 54.61 0.0010 0.0216 C101 Km 2 + 20.00 16.56 4.5 1.00 0.814 5.00 11.31 187.36 0.0035 0.0206 C102 Km 2 + 40.00 20.00 4.5 1.00 0.008 5.00 10.51 210.17 0.0040 0.0171 NC5 Km 2 + 45.76 5.76 4.5 1.00 0.35 5.00 10.85 62.45 0.0012 0.0131 C103 Km 2 + 60.00 14.24 4.5 1.00 0.70 5.00 11.20 159.52 0.0030 0.0119 X5 Km 2 + 61.87 1.87 4.5 1.08 0.73 5.00 11.32 21.13 0.0004 0.0089 DC7 Km 2 + 63.44 1.57 4.5 1.00 0.78 5.00 11.28 17.75 0.0003 0.0085 C104 Km 2 + 80.00 16.56 4.5 1.00 1.14 5.00 11.64 192.82 0.0036 0.0081 C105 Km 2 + 100.00 20.00 4.5 1.00 1.38 5.00 11.88 237.58 0.0045 0.0045
Bảng 11.13 Chiều cao rãnh phải xác định từ lưu lượng sơ bộ
STT Tên cọc Lý trình Qtt
(m3/s) br
(m) ir
(%) n hr_tt
(m)
Q'tt
(m3/s) ΔQ (%)
hr_hc
(m) 1 C55 Km 1 + 100.00 0.1446 0.40 3.02 0.02 0.145 0.146 0.7 0.345 2 D4 Km 1 + 108.25 0.1446 0.40 3.02 0.02 0.145 0.146 0.7 0.345 3 C56 Km 1 + 120.00 0.1427 0.40 2.46 0.025 0.172 0.143 0.0 0.372 4 C57 Km 1 + 140.00 0.1402 0.40 3.15 0.02 0.141 0.141 0.5 0.341 5 C58 Km 1 + 160.00 0.1362 0.40 1.76 0.03 0.202 0.135 1.0 0.402 6 X3 Km 1 + 172.36 0.1320 0.40 1.34 0.03 0.214 0.131 1.0 0.414 7 C59 Km 1 + 180.00 0.1294 0.40 0.80 0.03 0.244 0.128 1.0 0.444 8 DC4 Km 1 + 183.25 0.1278 0.40 1.23 0.03 0.216 0.127 0.3 0.416 9 C60 Km 1 + 200.00 0.1271 0.40 1.24 0.03 0.215 0.127 0.3 0.415 10 ND3 Km 1 + 218.54 0.1231 0.40 1.24 0.03 0.211 0.123 0.4 0.411 11 C61 Km 1 + 220.00 0.1179 0.40 1.24 0.03 0.207 0.118 0.4 0.407 12 C62 Km 1 + 240.00 0.1175 0.40 1.24 0.03 0.206 0.117 0.4 0.406
13 C63 Km 1 + 260.00 0.1111 0.40 1.24 0.03 0.200 0.111 0.4 0.400 14 C64 Km 1 + 280.00 0.1023 0.40 0.99 0.03 0.203 0.102 0.1 0.403 15 TD3 Km 1 + 288.54 0.0927 0.40 0.90 0.03 0.198 0.093 0.1 0.398 16 C65 Km 1 + 300.00 0.0884 0.40 1.24 0.03 0.176 0.088 0.5 0.376 17 C66 Km 1 + 320.00 0.0827 0.40 1.48 0.03 0.161 0.082 0.8 0.361 18 C67 Km 1 + 340.00 0.0729 0.40 1.48 0.03 0.150 0.072 0.9 0.350 19 P3 Km 1 + 355.30 0.0630 0.40 1.48 0.03 0.140 0.063 0.7 0.340 20 C68 Km 1 + 360.00 0.0554 0.40 1.47 0.03 0.129 0.055 0.0 0.329 21 C69 Km 1 + 380.00 0.0531 0.40 1.48 0.03 0.126 0.053 0.0 0.326 22 C70 Km 1 + 400.00 0.0432 0.40 1.48 0.03 0.112 0.043 0.0 0.312 23 DD5 Km 1 + 400.00 0.0334 0.40 1.48 0.03 0.097 0.033 0.0 0.300 24 C71 Km 1 + 420.00 0.0334 0.40 1.29 0.03 0.100 0.033 0.0 0.300 25 TC3 Km 1 + 422.06 0.0236 0.40 1.09 0.03 0.086 0.024 0.0 0.300 26 C72 Km 1 + 440.00 0.0226 0.40 1.05 0.03 0.085 0.023 0.0 0.335 27 C73 Km 1 + 460.00 0.0145 0.40 0.50 0.03 0.081 0.015 0.0 0.365 28 C74 Km 1 + 480.00 0.0063 0.40 0.50 0.03 0.050 0.006 0.0 0.303 29 PG5 Km 1 + 480.65 0.0002 0.40 0.50 0.03 0.006 0.000 0.0 0.300 30 NC3 Km 1 + 492.06 0.0034 0.40 -0.50 0.03 0.034 0.003 0.0 0.345 31 D5 Km 1 + 500.00 0.0055 0.40 -0.50 0.03 0.046 0.006 0.0 0.362 32 C75 Km 1 + 500.00 0.0055 0.40 -0.50 0.03 0.046 0.006 0.0 0.362 33 ND4 Km 1 + 506.10 0.0071 0.40 -0.50 0.03 0.053 0.007 0.0 0.367 34 C76 Km 1 + 520.00 0.0110 0.40 -0.50 0.03 0.069 0.011 0.4 0.353 35 C77 Km 1 + 540.00 0.0187 0.40 -0.64 0.03 0.088 0.019 0.3 0.300 36 C78 Km 1 + 560.00 0.0270 0.40 -1.28 0.03 0.089 0.027 0.6 0.300 37 TD4 Km 1 + 576.10 0.0342 0.40 -1.86 0.03 0.091 0.034 0.5 0.300 38 C79 Km 1 + 580.00 0.0360 0.40 -1.79 0.03 0.095 0.036 0.3 0.300 39 C80 Km 1 + 600.00 0.0450 0.40 -2.01 0.025 0.094 0.045 0.2 0.300 40 DC5 Km 1 + 600.00 0.0450 0.40 -2.01 0.025 0.094 0.045 0.2 0.300 41 C81 Km 1 + 620.00 0.0543 0.40 -2.19 0.025 0.103 0.054 0.2 0.303 42 C82 Km 1 + 640.00 0.0637 0.40 -2.19 0.025 0.112 0.064 0.1 0.312 43 P4 Km 1 + 643.49 0.0653 0.40 -2.19 0.025 0.114 0.065 0.1 0.314 44 C83 Km 1 + 660.00 0.0730 0.40 -2.19 0.025 0.122 0.073 0.1 0.322 45 C84 Km 1 + 680.00 0.0821 0.40 -2.19 0.025 0.130 0.082 0.1 0.330 46 DD6 Km 1 + 696.67 0.0896 0.40 -2.19 0.025 0.137 0.090 0.1 0.337 47 C85 Km 1 + 700.00 0.0911 0.40 -2.17 0.025 0.139 0.091 0.1 0.339 48 TC4 Km 1 + 710.87 0.0958 0.40 -2.07 0.025 0.145 0.096 0.1 0.345 49 C86 Km 1 + 720.00 0.0997 0.40 -1.63 0.03 0.175 0.100 0.1 0.375 50 X4 Km 1 + 734.05 0.1050 0.40 2.15 0.025 0.151 0.106 0.8 0.351 51 C87 Km 1 + 740.00 0.1067 0.40 -4.91 0.02 0.106 0.107 0.7 0.306 52 C88 Km 1 + 760.00 0.1109 0.40 -4.53 0.02 0.110 0.110 0.3 0.310 53 D6 Km 1 + 771.67 0.1134 0.40 -3.88 0.02 0.117 0.113 0.4 0.317 54 C89 Km 1 + 780.00 0.1152 0.40 -2.22 0.025 0.158 0.116 0.6 0.358 55 NC4 Km 1 + 780.87 0.1154 0.40 -0.50 0.03 0.262 0.116 0.7 0.462 56 C90 Km 1 + 800.00 0.1197 0.40 -1.47 0.03 0.199 0.120 0.0 0.399
58 C91 Km 1 + 820.00 0.1243 0.40 -0.68 0.03 0.249 0.123 0.7 0.449 59 C92 Km 1 + 840.00 0.1288 0.40 -0.50 0.03 0.275 0.128 0.8 0.475 60 DC6 Km 1 + 846.67 0.1309 0.40 -0.50 0.03 0.277 0.130 0.8 0.477 61 C93 Km 1 + 860.00 0.1349 0.40 -0.50 0.03 0.282 0.134 0.4 0.482 62 C94 Km 1 + 880.00 0.1412 0.40 -1.21 0.03 0.229 0.140 0.8 0.429 63 TD5 Km 1 + 885.78 0.1430 0.40 -1.50 0.03 0.217 0.142 0.9 0.417 64 C95 Km 1 + 900.00 0.1477 0.40 -2.45 0.025 0.177 0.149 1.0 0.377 65 C96 Km 1 + 920.00 0.1544 0.40 -1.74 0.03 0.219 0.156 0.9 0.419 66 P5 Km 1 + 925.77 0.1563 0.40 -1.51 0.03 0.230 0.158 0.9 0.430 67 CONG 3 Km 1 + 926.34 0.1565 0.40 -0.50 0.03 0.307 0.158 0.9 0.507 68 C97 Km 1 + 940.00 0.0454 0.40 -0.50 0.03 0.157 0.046 0.4 0.371 69 DD7 Km 1 + 943.44 0.0408 0.40 -0.50 0.03 0.148 0.041 0.3 0.388 70 C98 Km 1 + 960.00 0.0396 0.40 2.12 0.025 0.086 0.040 0.0 0.300 71 TC5 Km 1 + 965.76 0.0341 0.40 1.54 0.03 0.097 0.034 0.0 0.300 72 C99 Km 1 + 980.00 0.0322 0.40 3.10 0.02 0.060 0.032 0.0 0.300 73 C100 Km 2 + 0.00 0.0277 0.40 3.11 0.02 0.055 0.028 0.0 0.300 74 D7 Km 2 + 3.44 0.0216 0.40 2.65 0.025 0.057 0.022 0.8 0.300 75 C101 Km 2 + 20.00 0.0206 0.40 3.13 0.02 0.046 0.021 0.0 0.300 76 C102 Km 2 + 40.00 0.0171 0.40 3.37 0.02 0.040 0.017 0.0 0.300 77 NC5 Km 2 + 45.76 0.0131 0.40 1.16 0.03 0.060 0.013 0.0 0.300 78 C103 Km 2 + 60.00 0.0119 0.40 1.28 0.03 0.055 0.012 0.0 0.300 79 X5 Km 2 + 61.87 0.0089 0.40 1.50 0.03 0.044 0.009 0.0 0.342 80 DC7 Km 2 + 63.44 0.0085 0.40 1.14 0.03 0.046 0.008 0.0 0.300 81 C104 Km 2 + 80.00 0.0081 0.40 1.39 0.03 0.043 0.008 0.7 0.300 82 C105 Km 2 + 100.00 0.0045 0.40 1.39 0.03 0.030 0.004 0.3 0.300
11.2.4.5 Tính lặp lần 2 giá trị htt1 từ giá trị chiều cao rãnh phải bước tính lặp trước Cần hiệu chỉnh lại chiều sâu rãnh tại vị trí các cọc C59, DC6, C93, C97 để đảm bảo độ dốc yêu cầu.
Bảng 11.14 Lưu lượng tính toán sơ bộ của rãnh biên phải lần 2
Tên cọc Lý trình hr
(m)
Bph
(m)
Kph
(m)
BTLph
(m)
Bstb
(m)
BLVph
(m) Fi
(m2)
Qtti
(m3/s) Qtt
(m3/s) C55 Km 1 + 100.00 0.35 4.5 1.09 1.679 5.00 12.27 0.00 0.0000 0.1451 D4 Km 1 + 108.25 0.35 4.5 1.09 1.396 5.00 11.99 98.90 0.0019 0.1451 C56 Km 1 + 120.00 0.37 4.5 1.14 1.068 5.00 11.71 137.61 0.0026 0.1432 C57 Km 1 + 140.00 0.34 4.5 1.08 0.357 5.00 10.94 218.77 0.0041 0.1406 C58 Km 1 + 160.00 0.40 4.5 1.20 0.470 5.00 11.17 223.49 0.0042 0.1364 X3 Km 1 + 172.36 0.41 4.5 1.23 0.66 5.00 11.39 140.71 0.0027 0.1322 C59 Km 1 + 180.00 0.43 4.5 1.25 0.90 5.00 11.65 89.05 0.0017 0.1295 DC4 Km 1 + 183.25 0.42 4.5 1.23 1.05 5.00 11.78 38.31 0.0007 0.1279 C60 Km 1 + 200.00 0.41 4.5 1.23 1.95 5.00 12.68 212.32 0.0040 0.1271 ND3 Km 1 + 218.54 0.41 4.5 1.22 4.02 5.00 14.74 273.19 0.0052 0.1231
C61 Km 1 + 220.00 0.41 4.5 1.21 4.16 5.00 14.87 21.76 0.0004 0.1179 C62 Km 1 + 240.00 0.41 4.5 1.21 6.36 5.00 17.07 341.36 0.0065 0.1175 C63 Km 1 + 260.00 0.40 8.5 1.20 8.56 5.00 23.26 465.12 0.0088 0.1111 C64 Km 1 + 280.00 0.40 8.5 1.21 10.65 5.00 25.36 507.22 0.0096 0.1023 TD3 Km 1 + 288.54 0.40 8.5 1.20 11.47 5.00 26.17 223.42 0.0042 0.0927 C65 Km 1 + 300.00 0.38 8.5 1.15 11.58 5.00 26.23 300.72 0.0057 0.0884 C66 Km 1 + 320.00 0.36 8.5 1.12 11.51 5.00 26.13 522.57 0.0099 0.0827 C67 Km 1 + 340.00 0.35 8.5 1.10 11.53 5.00 26.13 522.69 0.0099 0.0729 P3 Km 1 + 355.30 0.34 8.5 1.08 11.53 5.00 26.11 399.40 0.0076 0.0630 C68 Km 1 + 360.00 0.33 8.5 1.06 11.24 5.00 25.80 121.26 0.0023 0.0554 C69 Km 1 + 380.00 0.33 8.5 1.05 11.48 5.00 26.03 520.69 0.0099 0.0531 C70 Km 1 + 400.00 0.31 8.5 1.02 11.52 5.00 26.04 520.80 0.0099 0.0432 DD5 Km 1 + 400.00 0.30 8.5 1.00 11.54 5.00 26.04 0.00 0.0000 0.0334 C71 Km 1 + 420.00 0.30 8.5 1.00 11.47 5.00 25.98 519.50 0.0098 0.0334 TC3 Km 1 + 422.06 0.30 8.5 1.00 11.06 5.00 25.56 52.69 0.0010 0.0236 C72 Km 1 + 440.00 0.33 8.5 1.07 9.15 5.00 23.72 425.51 0.0081 0.0226 C73 Km 1 + 460.00 0.37 8.5 1.13 7.12 5.00 21.75 434.93 0.0082 0.0145 C74 Km 1 + 480.00 0.30 4.5 1.01 5.54 5.00 16.05 320.96 0.0061 0.0063 PG5 Km 1 + 480.65 0.30 4.5 1.00 5.48 5.00 15.98 10.39 0.0002 0.0002 NC3 Km 1 + 492.06 0.34 4.5 1.09 4.30 5.00 14.89 169.88 0.0032 0.0034 D5 Km 1 + 500.00 0.36 4.5 1.12 3.39 5.00 14.01 111.23 0.0021 0.0055 C75 Km 1 + 500.00 0.36 4.5 1.12 3.39 5.00 14.01 0.00 0.0000 0.0055 ND4 Km 1 + 506.10 0.37 4.5 1.13 3.00 5.00 13.63 83.17 0.0016 0.0071 C76 Km 1 + 520.00 0.35 4.5 1.11 4.17 5.00 14.77 205.33 0.0039 0.0110 C77 Km 1 + 540.00 0.30 8.5 1.00 5.87 5.00 20.37 407.34 0.0077 0.0187 C78 Km 1 + 560.00 0.30 8.5 1.00 7.54 5.00 22.04 440.85 0.0083 0.0270 TD4 Km 1 + 576.10 0.30 8.5 1.00 9.11 5.00 23.61 380.21 0.0072 0.0342 C79 Km 1 + 580.00 0.30 8.5 1.00 9.12 5.00 23.62 92.11 0.0017 0.0360 C80 Km 1 + 600.00 0.30 8.5 1.00 9.42 5.00 23.92 478.46 0.0091 0.0450 DC5 Km 1 + 600.00 0.30 8.5 1.00 9.32 5.00 23.82 0.00 0.0000 0.0450 C81 Km 1 + 620.00 0.30 8.5 1.01 9.91 5.00 24.42 488.36 0.0092 0.0543 C82 Km 1 + 640.00 0.31 8.5 1.02 10.27 5.00 24.79 495.89 0.0094 0.0637 P4 Km 1 + 643.49 0.31 8.5 1.03 10.24 5.00 24.77 86.37 0.0016 0.0653 C83 Km 1 + 660.00 0.32 8.5 1.04 10.07 5.00 24.62 406.46 0.0077 0.0730 C84 Km 1 + 680.00 0.33 8.5 1.06 9.54 5.00 24.10 482.05 0.0091 0.0821 DD6 Km 1 + 696.67 0.34 8.5 1.07 9.05 5.00 23.62 393.77 0.0075 0.0896 C85 Km 1 + 700.00 0.34 8.5 1.08 9.01 5.00 23.59 78.53 0.0015 0.0911 TC4 Km 1 + 710.87 0.34 8.5 1.09 8.58 5.00 23.17 251.97 0.0048 0.0958 C86 Km 1 + 720.00 0.37 8.5 1.15 7.54 5.00 22.19 202.52 0.0038 0.0997 X4 Km 1 + 734.05 0.35 8.5 1.10 5.60 5.00 20.20 283.89 0.0054 0.1050 C87 Km 1 + 740.00 0.31 8.5 1.01 0.58 5.00 15.09 89.76 0.0017 0.1067 C88 Km 1 + 760.00 0.31 4.5 1.02 0.543 5.00 11.06 221.27 0.0042 0.1109 D6 Km 1 + 771.67 0.32 4.5 1.03 1.017 5.00 11.55 134.80 0.0026 0.1135 C89 Km 1 + 780.00 0.36 4.5 1.12 1.174 5.00 11.79 98.19 0.0019 0.1153
C90 Km 1 + 800.00 0.40 4.5 1.20 1.409 5.00 12.11 231.58 0.0044 0.1199 ND5 Km 1 + 805.78 0.40 4.5 1.20 1.440 5.00 12.14 70.14 0.0013 0.1212 C91 Km 1 + 820.00 0.45 4.5 1.30 1.490 5.00 12.29 174.76 0.0033 0.1245 C92 Km 1 + 840.00 0.48 4.5 1.35 1.563 5.00 12.41 248.27 0.0047 0.1292 DC6 Km 1 + 846.67 0.51 8.5 1.42 1.566 5.00 16.48 109.95 0.0021 0.1313 C93 Km 1 + 860.00 0.49 8.5 1.38 1.692 5.00 16.57 220.83 0.0042 0.1355 C94 Km 1 + 880.00 0.43 8.5 1.26 2.070 5.00 16.83 336.54 0.0064 0.1419 TD5 Km 1 + 885.78 0.42 8.5 1.23 2.198 5.00 16.93 97.86 0.0019 0.1437 C95 Km 1 + 900.00 0.38 8.5 1.15 2.711 5.00 17.36 246.92 0.0047 0.1484 C96 Km 1 + 920.00 0.42 8.5 1.24 3.242 5.00 17.98 359.62 0.0068 0.1552 P5 Km 1 + 925.77 0.43 8.5 1.26 3.375 5.00 18.13 104.60 0.0020 0.1572 CONG 3 Km 1 + 926.34 0.51 8.5 1.41 3.392 5.00 18.31 10.50 0.0002 0.1574 C97 Km 1 + 940.00 0.41 8.5 1.21 3.369 5.00 18.08 246.94 0.0047 0.0454 DD7 Km 1 + 943.44 0.39 8.5 1.18 3.366 5.00 18.04 62.07 0.0012 0.0408 C98 Km 1 + 960.00 0.30 8.5 1.00 2.975 5.00 17.48 289.39 0.0055 0.0396 TC5 Km 1 + 965.76 0.30 8.5 1.00 2.862 5.00 17.36 99.96 0.0019 0.0341 C99 Km 1 + 980.00 0.30 8.5 1.00 2.273 5.00 16.77 238.90 0.0045 0.0322 C100 Km 2 + 0.00 0.30 8.5 1.00 1.501 5.00 16.00 320.02 0.0061 0.0277 D7 Km 2 + 3.44 0.30 8.5 1.00 1.376 5.00 15.88 54.61 0.0010 0.0216 C101 Km 2 + 20.00 0.30 4.5 1.00 0.814 5.00 11.31 187.36 0.0035 0.0206 C102 Km 2 + 40.00 0.30 4.5 1.00 0.008 5.00 10.51 210.17 0.0040 0.0171 NC5 Km 2 + 45.76 0.30 4.5 1.00 0.35 5.00 10.85 62.45 0.0012 0.0131 C103 Km 2 + 60.00 0.30 4.5 1.00 0.70 5.00 11.20 159.52 0.0030 0.0119 X5 Km 2 + 61.87 0.34 4.5 1.08 0.73 5.00 11.32 21.13 0.0004 0.0089 DC7 Km 2 + 63.44 0.30 4.5 1.00 0.78 5.00 11.28 17.75 0.0003 0.0085 C104 Km 2 + 80.00 0.30 4.5 1.00 1.14 5.00 11.64 192.82 0.0036 0.0081 C105 Km 2 + 100.00 0.30 4.5 1.00 1.38 5.00 11.88 237.58 0.0045 0.0045
Bảng 11.15 Chiều cao rãnh phải tính lặp lần 2
Tên cọc Qtt
(m3/s)
br
(m)
ir
(%) n hr_tt
(m)
Q'tt
(m3/s)
ΔQ (%)
hr_hc
(m)
C55 0.1451 0.40 3.02 0.02 0.144 0.145 0.2 0.345
D4 0.1451 0.40 3.02 0.02 0.144 0.145 0.2 0.345
C56 0.1432 0.40 2.23 0.025 0.177 0.143 0.3 0.377
C57 0.1406 0.40 3.31 0.02 0.139 0.141 0.4 0.341
C58 0.1364 0.40 1.45 0.03 0.213 0.135 1.0 0.413
X3 0.1322 0.40 1.24 0.03 0.219 0.131 1.0 0.419
C59 0.1295 0.40 0.64 0.03 0.260 0.130 0.4 0.430
DC4 0.1279 0.40 1.53 0.03 0.204 0.128 0.0 0.416
C60 0.1271 0.40 1.25 0.03 0.214 0.126 0.5 0.415
ND3 0.1231 0.40 1.26 0.03 0.211 0.124 0.4 0.411
C61 0.1179 0.40 1.56 0.03 0.194 0.118 0.4 0.407
C62 0.1175 0.40 1.24 0.03 0.206 0.117 0.3 0.406
C63 0.1111 0.40 1.27 0.03 0.200 0.112 0.8 0.400
C64 0.1023 0.40 0.97 0.03 0.205 0.102 0.1 0.405
TD3 0.0927 0.40 0.96 0.03 0.194 0.093 0.1 0.398
C65 0.0884 0.40 1.43 0.03 0.169 0.088 0.5 0.376
C66 0.0827 0.40 1.55 0.03 0.159 0.082 0.8 0.361
C67 0.0729 0.40 1.53 0.03 0.149 0.072 0.9 0.350
P3 0.0630 0.40 1.54 0.03 0.138 0.063 0.4 0.340
C68 0.0554 0.40 1.69 0.03 0.124 0.055 0.0 0.329
C69 0.0531 0.40 1.49 0.03 0.126 0.053 0.0 0.326
C70 0.0432 0.40 1.55 0.03 0.111 0.043 0.0 0.312
DD5 0.0334 0.40 1.55 0.03 0.095 0.033 0.0 0.300
C71 0.0334 0.40 1.29 0.03 0.100 0.033 0.0 0.300
TC3 0.0236 0.40 1.11 0.03 0.086 0.024 0.5 0.300
C72 0.0226 0.40 1.05 0.03 0.085 0.023 0.0 0.335
C73 0.0145 0.40 0.50 0.03 0.081 0.015 0.0 0.365
C74 0.0063 0.40 0.50 0.03 0.050 0.006 0.0 0.303
PG5 0.0002 0.40 0.50 0.03 0.006 0.000 0.0 0.300
NC3 0.0034 0.40 -0.50 0.03 0.034 0.003 0.0 0.345
D5 0.0055 0.40 -0.50 0.03 0.046 0.006 0.0 0.362
C75 0.0055 0.40 -0.50 0.03 0.046 0.006 0.0 0.362
ND4 0.0071 0.40 -0.50 0.03 0.053 0.007 0.0 0.367
C76 0.0110 0.40 -0.50 0.03 0.069 0.011 0.4 0.353
C77 0.0187 0.40 -0.64 0.03 0.088 0.019 0.1 0.300
C78 0.0270 0.40 -1.28 0.03 0.089 0.027 0.6 0.300
TD4 0.0342 0.40 -1.86 0.03 0.091 0.034 0.5 0.300
C79 0.0360 0.40 -1.79 0.03 0.095 0.036 0.3 0.300
C80 0.0450 0.40 -2.01 0.025 0.094 0.045 0.2 0.300
DC5 0.0450 0.40 -2.01 0.025 0.094 0.045 0.2 0.300
C81 0.0543 0.40 -2.21 0.025 0.103 0.054 0.1 0.303
C82 0.0637 0.40 -2.24 0.025 0.112 0.064 0.1 0.312
P4 0.0653 0.40 -2.24 0.025 0.113 0.065 0.1 0.314
C83 0.0730 0.40 -2.24 0.025 0.121 0.073 0.1 0.322
C84 0.0821 0.40 -2.24 0.025 0.130 0.083 0.8 0.330
DD6 0.0896 0.40 -2.23 0.025 0.136 0.089 0.1 0.337
C85 0.0911 0.40 -2.22 0.025 0.137 0.091 0.5 0.339
TC4 0.0958 0.40 -2.12 0.025 0.143 0.095 0.4 0.345
C86 0.0997 0.40 -1.96 0.03 0.166 0.099 0.2 0.375
X4 0.1050 0.40 -1.25 0.03 0.147 0.064 0.0 0.351
C87 0.1067 0.40 -1.39 0.03 0.111 0.041 0.0 0.311
C88 0.1109 0.40 -2.87 0.025 0.110 0.070 0.0 0.310
D6 0.1135 0.40 -3.94 0.02 0.117 0.114 0.3 0.317
C89 0.1153 0.40 -2.71 0.025 0.149 0.116 0.8 0.358
NC4 0.1155 0.40 -12.04 0.014 0.069 0.116 0.5 0.462
C90 0.1199 0.40 -1.16 0.03 0.213 0.120 0.0 0.413
C91 0.1245 0.40 -1.04 0.03 0.223 0.125 0.0 0.449
C92 0.1292 0.40 -0.60 0.03 0.264 0.129 0.1 0.475
DC6 0.1313 0.40 -0.50 0.03 0.280 0.132 0.7 0.508
C93 0.1355 0.40 -0.50 0.03 0.283 0.135 0.4 0.488
C94 0.1419 0.40 -1.01 0.03 0.242 0.143 0.6 0.442
TD5 0.1437 0.40 -1.30 0.03 0.226 0.143 0.6 0.426
C95 0.1484 0.40 -2.16 0.025 0.182 0.147 0.7 0.382
C96 0.1552 0.40 -1.95 0.03 0.213 0.157 0.9 0.419
P5 0.1572 0.40 -1.68 0.03 0.224 0.159 0.9 0.430
CONG 3 0.1574 0.40 -13.55 0.014 0.080 0.158 0.4 0.507
C97 0.0454 0.40 0.74 0.03 0.141 0.046 0.4 0.406
DD7 0.0408 0.40 0.50 0.03 0.148 0.041 0.2 0.388
C98 0.0396 0.40 2.12 0.025 0.087 0.040 0.7 0.300
TC5 0.0341 0.40 1.54 0.03 0.097 0.034 0.0 0.300
C99 0.0322 0.40 3.10 0.02 0.060 0.032 0.2 0.300
C100 0.0277 0.40 3.11 0.02 0.055 0.028 0.1 0.300
D7 0.0216 0.40 2.65 0.025 0.057 0.022 0.9 0.300
C101 0.0206 0.40 3.13 0.02 0.046 0.021 0.0 0.300
C102 0.0171 0.40 3.37 0.02 0.040 0.017 0.0 0.300
NC5 0.0131 0.40 1.16 0.03 0.060 0.013 0.0 0.300
C103 0.0119 0.40 1.28 0.03 0.055 0.012 0.0 0.300
X5 0.0089 0.40 1.50 0.03 0.044 0.009 0.0 0.342
DC7 0.0085 0.40 1.14 0.03 0.047 0.009 0.7 0.300
C104 0.0081 0.40 1.39 0.03 0.043 0.008 0.7 0.300
C105 0.0045 0.40 1.39 0.03 0.030 0.005 0.1 0.300
Tất cả các mặt cắt ta đều có htc nhỏ hơn hoặc bằng chiều sâu rãnh sơ bộ hiệu chỉnh nên không cần tính toán bước lặp lần 3.
Vì thế, lựa chọn chiều cao rãnh này làm chiều cao rãnh để thiết kế cho rãnh biên phải.