- Hoanh dQx t{livi tri mep h(lluu diOOd~p:
2. TiOOtoan cae d~e trung ella sad6 tiOO HI = 37,80 25,00 = 12,80 m
ho=Om AT - m, - 2,5 128 -533 UL----.H1 - • , -, m 2m, + 1 2 *2,5+ 1 a] = (40,00 - 37,80).2,5 = 5,50 m a2= (40,00 - 28,00).2,25 = 27,00 m a3= (28,00 - 25,00).1,25 = 3,75 m L] = 5,33 + 5,50 + 5,00 +27,00 - 3,75 = 39,08 m I = 0,5a" = 0,5l~L; +Hi - LJ I = 0,5l~39,08' + 12,80' - 39,08j = 2,04 m L = L] + I = 39,08 + 2,04 = 40,10 m
3. Tinh luu luqng donvi qua d~p
q= k.Hi = 150*10-6• 12,80' = 3,06* 1006 m3/s.m
2L' 2 *40,10
4. Tinh cao di) dUOngbao hOat\livitri mep h\lluu dinh d~p - L~p phuong trinhduOng bao hoa
y= H] ~ = 12 80 ~Vi ' 40,10x = 2,021JX - Hoanh di) x t\livi tri mep h\lluu dinh d~p:
x = L - (& +a] +B) = 40,10- (5,33 + 5,50 + 5,00) = 24,27m - Tung di)yt\livi tri gifra dinh d~p:
y = 2,021 ~24,27 = 9,96 m
- Cao di) dUOngbao hoa t\livitri gifra dinh ~p: Vy= Do +y = 25,00 + 9,96 = 34,96 m
a-Mil-tIn!at qua chAn d~p
~ •. ~ ---,,-
~
b-Mil-tIn!at Ansau vao nen
~.. VMOX~. '%
~---" :~ ~~~
"');~;;< :"' ,f:z~)?
~ LOp k~p mem y€u
e-M~t In!at qua lOp k~p mem y€u d-Trt!at mi?t phan mai d~p
Hinh 2-24. Oie d\lIlg mift 6n djnh eua mai d~p clift I. Mil-tIn!at 2. Kh6i dift bi In!at 3. Mil-td~p sau khi In!at
Du ~p bi trug! theo d~ng nao cac trong cac d~g ahinh (2-24) thi cling d@u co m9t nguyen nhan chung la d9 xoai mai d~p va cuang d9 ct'1adftt d~p d~p; ngoai ra m6i d;mg mftt 6n dinh co m9t nguyen nhan rieng, ta cAn cM y d6 co giai phap hqp Iy,nhfun dam bao cho khiI nang 6n dinh ct'1ad~p.
- D;mg a : M(it trug! di qua chan d~p : Kh6i dftta mai bi trug! xu6ng duai theo Im(it trug! di qua chan d~p. Truang hqp nay thuang xdy ra khi dftt n@nt6t (n@nda ho(ic dfttco cuang d9 cao).
Nguyen nhan cht'1y~u: Do hai nguyen nhan chung da neu tren.
- D;mg b: M(it trug! an sau vao n@n: Kh6i dftta mal bi trug! xu6ng dum theo Im(it trug! an sau vao n@nva dAyIphAndftt n@ntr6i len tren. Truang hqp nay thuang xAyra khi dfttn@ny~u (n@ndftt set m@m,deo, nhao; bUn).
Nguyen nhan cht'1y~u: Do cuang d9 dftt n@ny~u.
(2-25)
+ H6 rut nhanh tU MNLTK ho~c tU MNDBT xu6ng d~n m1,lc nuac dam bilO an toan cho dftu m6i khi h6 co nguy ca s1,lc6 vad~p, nhung khong thAp han MNC +Thi~t bi thoat nuac trong than ~p lam vi~c khong binh thuang (bi hu h6~g m(lt phfrn) khi h6 aMNDBT
+Co d(lng dAt khi h6 aMNDBT
3. Trinh4rva nguyen tde tinh toim 6n d;nh #P ddt a. Ch(Jntr~img h(TJJtfnh toim 6n d;nh mai d~p ddt.
b. Tinh toan h~s66n d;nh nhiJ nhdt Kmin eho timg mai vm timg t~img h(TJJtinh toano
e. Ki€m tra va Mt lu~n.
Dieu ki~n an toan ve 6n diOO Clla d~p:
Kminmin~ (K] (2-24)
Kmimninhl tri s6 006 ooAt trong cac tri s6 Kmindii tiOOtoan tren .
(K] la h~ s6 an toan cho phep ve 6n diOOcua d~p dAt, xac diOOtheo ph\ll\lc 5 D~ dimi bao tiOO kinh t~, tri s6 Kmimninkhong nen qua 15% +20% so vo; he s6 an toan cho phep (K]
2.5.2. Tinb toan bf s6 6n dinb cua mai d~p (K)
1. Khi than d~p lam bang ddt khOng dinh
K =m.tg<p