I^ng dung cong nghe coc ximang dat trong xay dinng phan ngdm nha cao tang xay chen tai khu VIFC ven bien Vung Tau
Applications soil cement pile in building tall buildings built underground section inserts in the coastal area of Vung Tau
Ngay nhan bai: 05/12/2015
Ngay sij-a bai: 21/01/2016 Lirti V a n Quang ' Ngay chap nhan dang: 11/03/2016
ITOMTAT
' Cdng ngh$ cpc xi mang - deit da dii^c nghien ctfu va iing dung rfing rai tren the gi6i va Viet (Nam trong viec xCt 1^ nen M.t y^u va n^n mong cho cac cong trinh xay dUng. Tuy nhi6n viec p ling dyng cfing nghe coc xi mang - dat trong vi^c xii ly tii6ng vay cho cac cong trinh co tff 2 tang hSm xky chen trong dfi thi ven bien d midc ta con m6i me. Trong di^u kien dat cac khu vUc ven bien bi xam thiic ciia nUdc man, 16p cat be mat tiiOng doi day, mat khae viec xay chen cfing trinh c6 tang ham sau trong do thi v6i dieu kien chat hep. M6t trong nhiing tieu chi quan trpng khi thi^t k^ cgc xi mang-dat cho cac cfing trinh co tang ham sau la tinh toan kha nang chiu liJc, chuyen vi va nhiing phat sinh trong qua trinh thi cfing nhU han che sU sphdt tri^n ciia. miic niidc ngam, de khong anh hudng tdi cac cong trinh lan can, Vdi cac Uu
• diem noi bat ve khd nang xCl 1^, tien dp thi cong, an toan va hieu qua, gja thanh thap hon so ivdi cdc giai phip khic, Qua nghidn cdu iing dung cfing nghe nay cho cfing trinh xay dUng Ikhdch san Mahbu- TP Vung Tau, Chiing toi thay rang cong nghe nay rat thich hc*p cho cdc 11 cfing trinh xay di^ng c6 tang ham sau xay chen trong cac khu dfi thi ven bien.
iTU khfia: Coc ximang dat, ho dao sau, nha cao tang.
ri ABSTRACT:
I Technology cement pile - soil were studied and widely used in the world and Vietnam in dealing I with soft soil and the foundation for the construction work. However, the apphcahon of the ['I cement pile - in the processing of land for the constniction diaphragm walls with 2 cups ibasement buUt in coastal cities in our counOy is new. In terms of land area of coastal salt water 'intrusion, sand the surfece layer is relatively thick, on the other hand inserts the construction reworks in urban deep basement with cramped conditions. One of the most important critena
"Iwhen designing cement - soil piles for buildings with basement depth is calculated bearing icapacity, displacement, and problems arising in the course of construction, such as limiting the idevelopment of ink groimdwater, so as not to affect the neighboring buildings. With the
^outstanding advantage of processing capabilities, the progress of construction, safety and ''efficiency, lower costs compared to other solutions. Through research and application of this j, technology for building hotels Malibu - Vung Tau City. We found that this technology is very isuitable for construction with deep basement construction Built insert in coastal urban areas.
Keywords: Soil cement piles, deep excavations, buOdings.
ThS. Liiu V5n Quang, Khoa Xay diing - TrUdng DH Ba Ria - Vung Tau Email: [email protected], Tel: 0937 813 858
1 . Dat van de.
Ngay nay, nhu cau ve viec sCf dung khdng gianngam lam khu ky thuat cung n h u l a m c ^ c bai dau xe ngam trong cac khu do t h j , he thong x i i ly nUdc theii...ngay cang gia tang.
Cac cong trinh xay dUng nha cao tSng pho bien sii dung 2 tang ham chiem da so trong cac cong trinh xay dUng trong nhOng nam gan day.
V6i dieu kien dia ch^t tai khu vUc ven bien khu vUc Vung Tau co 16p cat be mat tu'Ong dfii day pho bien khoang 7 den 12m, ngay dUiSi 36 \a ldp biin set deo thap pha cat. Mat khSc so vdi cac phuong phap sCt dung cCf larsen hoac Sli dung cil be tong cot thep thi cong b^ng bua rung thi Uu diem cCia coc xi mang dat la.
- Toe d6 t h i cong nhanh, chat luang coc duoc ki^mso^t tdt.
- Thi'ch hop vdi moi loai dat, pham vi iing dung rdng.
- Co the x i i \)f dudi mong hoac ket cau hien c6 ma khong ^nh hudng tdi cong trinh hien CO.
- Mat bang t h i cong nh6, it chan dong, it tieng on, han che toi da anh hudng i d i cong trinh lan can.
- Thiet bi nh6 gon, co the t h i cong trong khong gian co c h i l u cao han che, nhieu chudng ngai vat.
- Sau khi thi cong mong xong khflng phSi rut cji, mat khae h& tUdng vay nay se bSo ve phan ket cau cong trinh khong bi hU hai trong qua trinh s£r dung.
Vdi nhuttg uu diem tren, bUdc dau nghien ciiu Ung dung cho cac cong trinh xSy dung khu vUc ven bien Vung Tau. Thiet lap mo hinh va cac thong so tinh toan cho coc xi mang dat.
2. PhUtfng phap ngien cihi va cdc thong s6 tinh toan.
Sd dung phan mem Plaxis tinh toSn va ket hop vdi so lieu quan trac bien dang thUc te sau khi thi cong cong tfinh.
2.1. Xdc dinh thdng so ddu vdo tinh todn nhusau:
04.2016EU!(ni(ia»l|75
STT L d p l A - C d t c a p phdi k^m Ldp 1 -Cat pha bui set Ldp 2 Set d^o thap pha cat
SPT (N) 13,0
17,0
9,0 9 (do) 37,9
33,0
15,0 Es=1,0N
(Mpa) 13,0
17,0
32,5 (IVlpa)
13,0
17,0
32,5 39,0
51,0
97,5
(Mpa) 9,10
11,90
22,75 m=0,5
0,5
0,5
0 ^ Rinter
1,0
1,0
1,0 (kN/m^)
4,45 1
1,00 ,,
29,80
Theo TCVN 9403; 2012 Gia cd nen dat yeu - phUOng phap tru dat xi mang. Phu luc C tinh toan nen gia ca theo bi^n dang.
- Che thong sd chl ti&u cd ly cua dat (c, (p.YmM.ykho, - ) lay ^ ho so khSo Scit dia chat.
- Yeu cau tru xi mang dat co: qu = 15kg/cm^
Q = Y = Y = 7,51^/cm^ = 730kN/m^
- Mo dun dSn hoi vat lieu tru Ec = (50-100),Cc G : cUdng dfl khang cat cOa vat lieu tru.
- Chon Ec = 100. C^ = 100.750 = 75 OOOkN/m^
- H # s 6 p i s o n : 8 = 0,25
- Dung trong cilia coc xi mang y = 20,0 k N / m ^
- EJgf; Tinh toan t d t h i nghiem 3 true theo so do CD, E^|J,, E^Jf: ttnh t d ket quh n^n cd k e t Chon E^^ = 3. E^^. E™(, = 0.7 E^S' de tinh toan t r o n g m f l hlnh.
2.2. Thdng sddia chdt cdng trinh:
2.3. Md hinh tfnh todn kit cdu
Hinh 1: Mat bing bo tn coc lam tUOng clian
Khu vUc I: Hang ngoai duong kmh coc D=700mm chi^u sau khoan Ls7,5m; Hang giu'a dudng kfnh coc D=700mm, chieu sSu khoan L=8,5m (2,5m tren khflng vda); Hang trong dUdng kinh coc D=700mm, chieu sau khoan L=12,0m (3,0m tren khong phun vua), nhu'ng vi t r i 3 hang sau 12,0m (5,0m tren khdng vda)
Khu vuc II: Hang ngoai dUdng kinh coc D=700mm chieu sau khoan L
=7,5m; Hang gida di/dng ki'nh coc D=700mm chieu sau khoan L=9,0m (2,5m tren khong vda); Hang trong dudng kinh coc D=700mm, chieu sau khoan L=12m ( 3 m tr^n khflng phun vita), nhdng vj tri 3 hang sau 12m { 5m tren khong vda)
Khu vifc III; Hang ngoai dUdng kinh coc D=700mm, chieu sau khoan L=13,5m; H^ng gida dUdng kinh coc D=700mm, chieu sau khoan L=13,5 [2.5m tr^n khong vOa); Hang trong dUdng kinh cpc D=700mm, L=13,5m {5m tren khong vda).
3. l o n g hop ket q u i tinh toan M f l t a
Du bao chuyen vi ngang He so dn djnh tong t h ^ Cudng do coc x i m a n g
khu vUc 1 369mm
1.081 I S k g / c m '
khu vUc II 415mm
1.057 15kg/cm^
khu vuc 111 90mm
1.045 ISkg/cm'
L T
Du bao chuyen vi ngang coc xt mang thoang 369mm.
in dinh tong the FS=1
761
r^BB i:^,^ f
Dubao chuyen vi nganc; cocxi mang khoang 415mm,
H'inli2 Mat bang khi t h i cong 4. Ket luSn va KiSn nghi.
Qua nghien cdu tai hien trUdng va tinh toan trong phong t h i nghi&m cho thay cudng do cila coc dat mac cao hon mac thiet ke, do dong nhat cCia vat lieu tot, cac coc lien nhau co lien ket vdi nhau tot tranh dUpc su hlnh thJnh nudc ng^m theo phuong ngang.
Viec sd dung tudng chan xi mang dat phu hop vdi cflng trinh co 2 tang ham xay chen trong do thi vdi dieu kien chat hep va dja chat co nhieu cat nhu tinh Ba Ria - Vung Tau vdi chi phtgiam k h o i n g 40% so vdi phuang an dung tudng cCf Larsen thong thudng.
Can tiep tuc tien h i n h cac tinh toan va co doi chieu vdi che cflng trinh tuong t u de co cac ket luan tong quan va chinh xac hon.
Co the nghien cdu sd dyng coc xi mang dat lam tUdng ke chan ven b i e n d e t r a n h x a m thuc cOa bien vao trong dat lien
TAIUEUTHAMKHAO
[1] Theo TCVN 9403 2012 Gia co n l n dat y e i i - p h u o n g phap tru dat x i m a n g . Phu lucC t i n h toan nen gia co theo bien dang;
[2j Bao cao khao sat dia chat cong tfinh
Dubao chuyen vi ngang cociii mang khoang 90mm
