ELSEVIER GEO-ENGINEERING BOOK SERIES VOLUME 5 Part 5 doc

... 238 References 239 15 Tunnelling machines 241 15. 1 General 241 15. 2 System’s mis-match 241 15. 3 Tunnel jumbo 242 15. 4 Muck hauling equipment 244 15. 5 Tunnel boring machine (TBM) 2 45 15. 6 Safety during ... to 15 cm 10 to 15 cm Rock bolt as required (1.2 to 1.8 m center to center) xii Contents 5. 3 Updating the Q-system 58 5. 4 Collection of field data 59 5. 5 Classification...

Ngày tải lên: 08/08/2014, 13:21

... typical value (60%) Maximum value (30%) Weighted average RQD 25 65 85 67 J n 12 9 – 9.42 J r 1 .5 3 4 2. 05 J a 4211.9 J w 0.66 1 1 0.966 SRF 7 .5 5 2 .5 4 .5 observed parameter, i.e., 10% poorest, 60% most typical, ... the use of J w =1.0, 0.66, 0 .5, 0.33, etc. as depth increases from 0 5, 5 25, 25 250 to > 250 m is recommended, assuming that RQD/J n is low enough (e.g., 0 .5 25...

Ngày tải lên: 08/08/2014, 13:21

... and Metallurgy, London, Chapters5&9. Rabcewicz, L. V. (1964–19 65) . The new Austrian tunnelling method. Water Power, Part I, 1964, 453 - 457 ; Part II, 1964, 51 1 -51 5; and Part III, Jan. 19 65, 19-24. Rabcewicz, ... (MPa) (1) (2) (3) 0 .5 2.7 0.86 1 2.2 0.7 2 1 .5 0.4 75 3 1.2 0.38 4 1.0 0.317 5 0.8 0. 25 0123 456 0.2 0.4 0.6 0.8 1.0 Boundary Conditions Tunnel depth = 5...

Ngày tải lên: 08/08/2014, 13:21

... >30 0.0 25 1 .5 2 m ≤ b 40–10 5 14 >10 >1 .5 0. 05 ≤ 2 40–10 5 14 >10 <1 .5 0. 05 1 .5 2 m 2 40–10 5 14 >10 >1 .5 0. 05 1 .5 2 m 2 40–10 5 14 >10 <1 .5 0. 05 1 .5 2 m 20–30 mm 2 40–10 15 23 ... 0. 05 1 .5 2 m ≤ 2,3 b 40–10 15 23 >10 0. 05 1 .5 2 m 50 –100 mm 2,3 c 40–10 9– 15 0. 05 1 .5 2 m ≤ 2,4 b 40–10 15 40 >10 0. 05 1 .5 2 m ≤ 2,3 ,5 b...

Ngày tải lên: 08/08/2014, 13:21

... new discontinuities Less discontinuities induced in good quality rock mass 4,1 4,2 4,3 4,4 4 ,5 4,6 5, 1 5, 2 5, 3 5, 4 5, 5 5, 6 6,1 6,2 6,3 6,4 6 ,5 6,6 Larger caverns may be created in better quality rock masses Fig. 13.2a ... the rock mass is excavated 4. Squeezing Minor squeezing (u a /a =1–2 .5% ) Severe squeezing (u a /a =2 .5 5% ) Very severe squeezing (u a /a =5 10%) Extreme...

Ngày tải lên: 08/08/2014, 13:21

... (surface) 25 30 55 0. 45 Elevated (super structure) 100 30 130 0. 75 Long span bridge 250 30 280 0.90 Cut and cover 100 to 200 40 140 to 240 0.70 to 0.80 Tunnelled 150 to 50 0 50 200 to 55 0 0. 75 to 0.90 Tunnelling ... advance Favorable ground 50 –60 m/month 200–700 m/month 350 –800 m/month 150 –300 m/month 50 0– 150 0 m/month Unfavorable ground 7–10 m/month 50 –60m/month 75 150 m...

Ngày tải lên: 08/08/2014, 13:21

... 75 42212 .57 .54 5 29.7 59 .4 37.0 108.7 1.6 0 .55 Heavy burst Mod. slabbing with noise 14. 12273–12322 1090 50 70 43312 .57 .0 45 29.4 58 .9 36.2 107.2 1.6 0 .55 Heavy burst Mod. slabbing with noise 15. ... Low stress stress stress stress stress stress stress stress Rating 2 .5 2 .5 2 .5 2 .5 2 .5 2 .5 2 .5 2 .5 Q Value 18 19 19 35 38 37 25 24 364 Tunnelling in weak rocks Sin...

Ngày tải lên: 08/08/2014, 13:21

... size 6. 35 mm Mean aggregate size 10 mm S. No. Material Quantity, kg/m 3 Quantity, kg/m 3 1. Cement 446 55 8 >4 45 2. Blended sand 6. 35 mm maximum size 1483–1679 697–880 3. 10 mm aggregate – 700–8 75 4. ... 697–880 3. 10 mm aggregate – 700–8 75 4. Steel fiber 39– 157 39– 150 5. Accelerator Varies Varies 6. Water/cement (by weight) 0.40–0. 45 0.40–0. 45 Advantages of SFRS over shotc...

Ngày tải lên: 08/08/2014, 13:21

... 13 .5 – 57 60 51 80 4690 4270 5 ′′ × 5 ′′ Stanchion 16.0 4.68 6920 6220 56 30 51 30 5 ′′ × 5 ′′ H 18.9 5. 54 7860 7060 6390 58 20 6 ′′ I 12 .5 3.67 55 90 50 30 454 0 4130 3790 6 ′′ I 17. 25 5.07 7100 6380 57 70 ... – 11800 1 057 0 957 0 8710 8040 7360 6830 6 350 59 30 7 ′′ I 15. 3 4 .50 59 90 54 50 4990 4610 8 ′′ I 18.4 5. 41 7640 6 950 6370 58 60 54 50 8 ′′ I 23.0 6...

Ngày tải lên: 08/08/2014, 13:21

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