n doc Chie gag
THANH PHAN VA KHOI LUVNG KHAO SAT DIA CHAT CONG TRINH
DIA CHAT CONG TRINH
Dieu 39. Thanh phAn va khOi luvng khan sat DCCT bulk 14p NCTKT 1. Mix dichva nh*Ti vu
Danh gia dien kin DCCT cua cac dia di6m so chon, lam ca so. a quy6t dinh chon dia di6m trong cac dia diem so sanh.
2. Thanh phAn khao sat DCCT
Thgc hien or tat ca cac dia di6m so chon theo thin to sau: a) Thu thlap, phan tich, tong hop, danh gia cac tai lieu da có.
b) Phan tich khong anh, anh vu tru tai dia di6rn có di'eu kin dia chAn kin tao phuc tap.
c) Danh gia kin tao dOng dAt va cac hoat dOng dia dOng luc hien dai.
d) Di khao sat thuc dia bang hanh trinh tong hop có su tham gia cua CNDA va cac bOs mon khao sat khac.
e) Do ye dia chat cong trinh. f) Tham do dia vat VT.
g) Khoan, dao, xuyen.
h) Nghien cfru dia chat thily van.
j) Lap Wo sci DCCT.
3. NOi dung \Ta kh6i lugng khao sat DCCT
a) Thu tNp va phan tich tai lieu lien quan den cong trinh
- Cac loai ban d6 khong anh, dia hinh, hanh chinh, giao thong, quy hoach a cac tST
e.
- Cac tai lieu dia chit chung, cac ban d6 dia chAt tST le nho den
- Cac tai lieu ve dia mao, kin tao dOng clAt va tan kin tao, dia chit, DCCT, DCTV.
- Cac tai lieu dia vat
- Cac tai lieu ve khoang san (ban d6 dia chAt khoang san va cac tai lieu khac). - Cac tai lieu NT' WAD thien nhien.
b) Sau khi tong hop, phan tich, clanh gia tai lieu da thu thap thy da có du tai lieu dap urn dugc yeu cau thi khong can tien hanh cong tac khdo sat tai thuc dia.
c) Danh gia kin tao dOng &At va cac hoat dOng dia dOng luc hien dai
Sir dung TCVN 9386:2012 Thiat ke cong trinh chiu dOng dAt de danh gia do nguy hiern dOng data buov nay.
d) Hanh trinh dia chit khai quat
Thuc hien cong tac thuc dia de thu thlap cac tai lieu can thi6t nhu m6 to di6m 10 dia chdt, DCTV, kie'n tao, dia tang, thach hoc,...dan sinh, giao thong a cac dia di6m so chon.
e) Do ye 14p ban d6 DCCT
Pham vi do ve cua cac dia di6m so chon theo yeu cua cua thie't ke. Ban do DCCT do ye a tST le 1:50.000 — 1:10.000.
f) Cong tac tham do dia vat VT
Llap mot so mat cat di@i, do sau dien dai din di qua cac cong trinh chinh trong TMB du kien.
g) Cong tac khoan, dao
Cache) khoan, dao bo tri tren cac tuy6n mat cat dai dien, trang vai tuye'n do dia vat 1S7. Khoang cach gitra cac ho tham do 200-400m, dO sau theo dieu kien dia chat cu the nhung ho khoan kh6ng sau qua 50-100m, ho dao phap khao sat thuy hien tuan thit theo tieu chuan trong Phu luc D3 kern theoQuy dinh nay. Khoi lugng cu the theo nhiem vu khao sat xay dung dugc chu dau to chap thuan.
h) Thi nghirri hien tmang
gl),Thi DCTV: Cac khoan phai do muc nuac duai ddt xuAt va on dinh. Tien hanh thi nghi411 do nuov, muc nuoc, ep nuac. Toi thieu 01 thi nghirn de xac dinh N so tham cho moi don nguyen DCCT.
g2) Cong tac thi ngh*n SPT, cat canh thuc hien trong ho khoan: Thuc hien trong 1-2 ho khoan cho moi dun nguyen DCCT.
i) Thi nghien trong ph6ng
- ddt nguyen clang: Tir 1- 3 mau cho moi don nguyen DCCT. - Mau thach hoc: Tir 1-2 mau cho moi loci da.
- Mau co. VT da: Tir 1-3 mau cho moi cho moi dori da cua mot loci (la.
- hoa ntrac danh gia an mon be tong va kim loci tir 1-3 mau nuoc mat, tir 1-3 mau ntrac clued dAt cho moi tang.
4. Thanh phAn h6 so. va not dung bao cao DCCT
Thuc hien theo Phu lac Cl — Phu lac cac cong trinh nh* dien kem theo Quy dinh nay.
Dieu 40. Thanh phan va khOi bong khao sat DCCT bulk 14p NCKT
1. Muc dich, nhiem vu va thanh phAn cong tac khao sat
a) Lam r6 diL ki'0DCCT phuc vu viec lua chon mat bAng xay dung, xac dinh sor b0 cac giai phap thiet ke va lap tong mix dau to cua du an.
b) De xuat bien phap xir ly cac vAn de DCCT phirc tap.
c) Thanh phan cong tac khao sat DCCT nhu buck lap NCTKT. 2. Nk5i dung va kh6i luong khao sat DCCT
a) Thu thap va phan tich tai lieu dd. có
Thu thap va phan tich tai lieu da co 6, buelc lap NCTKT. Khi phan tich tai lieu cu can danh gia khach quan k6t qua khao sat dathuc hien de l'Op nhim vu khdo sat phit hop vai thuc te.
b) Ban do khong anh (bao gi6m anh chap tir ve tinh va may bay cho khu vac có dieu ki/0 kien tao, Ong dat phirc tap)
Sfr dung cac ke't qua dd. co O. buac lap NCTKT. Trong trifeng hop con nghi vAn mai tie'n hanh kiem tra lai teen co sa cac anh da co. Pham vi va mac do nghien ciru chi thuc hien tai cac mat bang so sanh.
c) Ranh gia ki6n tao d(ing clAt va cac hog dOng dia dOng lac hien dai
- Ne'u CAI) dOng d'At khu vac cong trinh< VII thi sfr dung TCVN 9386:2012 Tieu chu'An thi6t ke chiu dOng d'At.
- Ne'u cap dOng d'At > VII, va cap cong trinh > I thi phai co chuyen d6' nghien ciru rieng.
d) Do ve lap ban d6 DCCT
- Pham vi do ye bao tram cac mat bang so chon. Ty le do ve thuong la 1:5.000 clan 1: 10.000.
- Cong tac do ye DCCT phai tian hanh demg then veri nghien ciru DCTV, hang dOng karst, dia mao, kien tao (cac di6m xu'at to DCTV, ngu6n mroc nOng, nuOc khoang,...), kha nang tham, sat for bor ho, anh huong dm du an den moi truong va cac hoat clOng kinh vela mot trong cac yeu to lien quan den vi& lua chon va danh gia an toan cua mat bang du kien xay dung NMND.
- Vic phan \Tung DCCT, DCTV phai dkra tren cac danh gia, phan tich tong hcrp cacyau to dia tang, dia mao, kientao, thach hoc, d:a.c tinh co. VT cua dat da va cac qua trinh dia chat dOng tkrc trong mat bang du kien xay dung.
- COng tic nghien ciru DCTV can chu y cac di6m sau:
+ Xac dinh dien phan chiL day dm tang chira nuerc, dO sau xuAt va on dinh muc nuo.c duoi dat, cac tri so ap lgc(nuck c6 ap), mien cung cap va thoat nuo.c cua tang chira nuoc.
+ Xac dinh tinh thdm, quan thily lge gift cac t'ang,chfra nuarc va nuoc mat, chieu sau, the nam, dao dOng Inge nuac theo va nhieu nam, huong chuyen dOng cua nu& duoi dat, thanh phan Ma hoc, nh* d(5, tinh an mon dOi voi be tong va kim loai cua nuo.c.
+ Xac dinh cac ngu'on chinh nhiem bAn do con nguesi. Du bac) kha nang ban ngap va tinh nhiem ban do thanh phan Ma hoc thay doi trong nam.
+ Khi trong khu vu.c chi c6 01 tang chira nuo.c, thi do sau h6 khoan vao tang cach nuorc tir 1-2m, nhung kh6ng sau qua 50m.
+ Khi trong khu vkrc c6 nhiL tang chira nu& thi mot so h6 khoan phai khoan qua het cac tang chira nuo.c va c6 bin phap ngan each gifra cac tang chira nuac de phuc vu nghien cim DCTV.
e) Tham do dia vat ly
- Cong tic tham do dia vat VT ,la phuang phap nghien ciru trung gian xac dinh cac thong so dia vat VT nhudin fres suit cua dat da, van toc song doc, dO 16 rung, mo dun bien clang, m6 dun dan hoi cua dat, tixng doi da va cac di thuarng dia vat 17,...lam co soy phan chia cac doi phong hoa theo chieu sau, cac tang chira nuo.c, tang cach nuac, cac dori phi huy kien tao va phuc vu thiet ke tiep dia cho cac khu wc cong trinh.
- Cac phuang phap Ai) dung: Do mat cat di'0, do sau dien, dia chin, karota trong ho khoan. S6 lugng tuyen dia vat VT, do karota, dia chan trong ho khoan phu thuOc vao dieu ki@-1DCCT va yeu c'au cua CNDA-CNTK duo.c chu dau to phe duyt.Mat c10 diem do tir 10-20m/1 di6m.
f) Khoan, dao
- Cong tic khoan, dao chu y6u tap trung vao cac vi tri mat bang nha may chinh. Khoang each gitra cac h6 khoan tir 50-100m.
- Tai khu we btS tri co. so. ha tang, cong trinh they cong, khu nha cac cong trinh duang giao thong ngoai khu cong trinh chinh, bai thai thi khoang each gitra cac ho khoan tir 50-150m va c6 th6 thay c161 (day han) phu thuOc vao cap phirc tap DCCT.
- DO sau cua h#6 khoan phu thuOc vao dac di6m DCCT cua nen, chiL day doi anh huemg va tai trong cong trinh tic dung len day mong. Thu mg dO sau ho khoan phai sau han dad anh huong cua cong trinh, do sau ho dao tir 4-6m.
- Tay theo k6t cdu cac loai mong (mong dcm, mong be, mong bang, mong coc) dO sau day mong (ho4c dau coc) cua cac loai mong ding khac nhau. Khi nen cong trinh c6 dieu kien dia chat pink tap thi dO sau ho khoan phai du sau de the xac dinh duo.c bien phap xir
- N'L d(') sau dad anh hueyng cua cong trinh la da khong hem tan thi d'c') sau vao dori
phong hoa nhe (TB) khoang 2m. Nhung trong ph4m vi nghien cfru phai c6 01 h6 khoan
sau vao doi phong hoa nhe khong it horn 10m.
- N6u nen c6 da hem tan (dd voi, thqch cao) thi ho khoan nghien ciru sau khong nho Ilan 50m.
- N'L trong khu vuc phat triL karst thi h'6 khoan phai sau de tim ducc quy luat phat trien karst va bien phat
-,Trongmlat bang nha may chinh phai c6 it nhAt 25% so he) d'c') sau 30-50m.
Neu nen la dat yeu (bun) thi do sau khoan tir 70-100m.
- Tai khu vuic so chon c6 tuy6n dap va de thi khoang each gifra cac h6 tharn do va so luting theo bang 1 duai day:
Bang 1. Khoang cach va s('') luting cac ho tharn de thuOc cong trinh dap, de
Stt
D4c di6m ding trinh d4p, de
St) lugng h6 tharn do t6i thi6u, khoang cach (m) CAp phirc tap dia chat ding trinh
I II III
1 Dap va de cao khong qua 5m
tren 01 km dai 3, den 400 5, den 250 7, d6n 150
r 2 D4p va de cao 5-10m Khong it han 03 h6 khoan
5, an 250 7, d6n 150 10,d6n 100
3 D4p va de cao 10-15m Khong it han 4 ho khoan
7, an 150 10, an 100 12, d6n 75
4 D4p va de cao han 15m Khong it horn 5 he) khoan
10, d6n 100 12, d6n 75 14, d6n 50
5 Khu 110 be, sung (cap nuov ky
thuat bo sung)
Khong it han 6 11'6 khoan
3 4 5
- sail 116' khoan phu thuOc vao di'eu kien DCCT. Khi tang cach nuac nam sau
thi do sau ho khoan gap 2 lan chieu cao cho dap cao 5m, 3 lan cho dap cao 5-15m va 2- 3 1A.n chiL cao dap lan Ilan 15m.
g) Kh6i luting thi nghim ngoai trOi cho moi vi tri mat bang - Xuyen tinh la 6 di6m/don nguyen DCCT.
- SPT la 6 lan/lop, n'eu la &At bun thi khong thuc
- Karota d6ng vi ph6ng x4. to 3-10 di&n/dcm nguyen DCCT. - Cat canh (cho lap dal y'6u: bim, set deo,...) la 03 mau cho mot - Nen ngang la 03 mau cho mot
- Thi nghien DCTV:
+ Hut nuocclan hoac chum trong tang chfra nu& c6 N se) thAm > 0,1mingdy tier 1- 2 vi tri cho moi tang chua nuot.
+ Ep nuac to 1-3 doan cho 01 doi cila 01 loai dd lam n'en cong trinh. h) Kho'i lugng thi nghi"e'm trong phOngcho m8i vi tri mat bang
- Mau nguyen clang khong it han 6 mau cho mot lorp da't. - thach hoc 2-3 mau cho mot loaf dd.
- Mau Ca VT da 2 -6 mau cho 01 clai phong hoa/1 loai dd. - H6a nuac 03 mail an mon be tong cho 01 tang chira nuac.
- Hoa nu& phan tich toan dien cho 01 fang chira nu& to 1-2 m'au. i) Vat lieu xay dung thien nhien
Cac loai VLXD bao gom clAt dinh, cid cuing, cat, soi phuc vu xay clung nha may can tien hanh tim kiem, tham do danh gia tru lugng o. cap Cl (co khoi lugng gap 3 lan yeu cA.0 cua thi6t k6). Ban d6 de tinh tru lugng co tS7 Fe 1:5.000 - 1:10.000. Khi thgc hien cong tac tim kiem tham do VLXD sir dung "Quy trinh ve tim ki6m, tham clO, lay mau va thi nghiem vat lieu khoang dUng cho xay dung cong trinh thUy cong QTTL-B.1- 74".
3. Thanh phan 116 so. va n(ii dung bao cao DCCT
Thgc hien theo Phu luc Cl — Phu luc cac cong trinh nh* dien kem theo Quy dinh nay •