Phân tích tường trong đất chịu tải trọng ngang theo phương pháp dầm trên nền đàn hồi

Phan tich tiFang trong dit chju tai trong ngang theo

phiFo^ng phap dam tren nen dan hoi

Analysis of Diaphragm Wall Under Lateral Load by Beam on Elastic Foundation Method

Ngay nhan bai: 6/10/2014

Ngay su^ bai: 13/12/2014

Ngay chap nhan dang: 08/01/2015

T 6 M TAT:

Bdi bdo trinh hky 16i giai giai tich ciia bieu

thtlc he so n^n de phan tich tudng trong

dat theo phUdng phap phan ttf hiiu han

cho dam tren nen dan hoi. Bieu thijtc tinh

toan h^ so nin 6i xuat dddc kiem chiing

tii sd so sdnh ket qua tinh toan vdi phan

tich phan tii hflu han hai chieu.

Tii khia : Tiidng trong dat, h^ so nen,

bit?n d^ng ph^ng, dSm, nen dan hoi, phan

ttf hiiu h^n.

ABSTRACT:

This paper presents a analytical solution

of subgrade reaction formula in order

to analysis of diaphr^m wall by finite

element method for beam on elastic

foundation. The proposed formula is

verified from comparison of its results to

2D finite element analysis results.

Keywords: Diaphragm wall, subgrade

reaction, plane strain, beam, elastic

foundation, finite element.

TS. Nghi£m Manh Hien

Trudng Dai hgc Kien triic Ha Noi

l.Gidi thieu

Tinh todn tudng tang ham cho Pid dao sSu

twin nay thudng sil dung hai phuong ph5p

Icl dSm tren nen dan hoi hai chieu vh phu'ong

ph^p phan t d hQu han hai hoae ba chieu

PhUcmg phdp phan ti!r hQu han cd Qu diem la

md xi sat thuc su lam viec cua he ket cau vi

dat ni n dUa trdn cac mo hinh dng xis cua dSt

nin Tuy nhien, de sd dung phuong phap nhy,

ngudi thiet Ice can cd kien thdc chuyen sau ve

dia ky thuat va mo hlnh dat nen. Phuong phSp

dam tren nen dan hoi dUa tren m6 hlnh d^t

nen cue bd Winkier khdng m6 tS ho&n tOcin sU

\hm vile cCia hi kit clu vi dat nen do md hlnh

hda dit nir) xung quanh tudng bSng cac Id xo.

Tuy nhidn phUcJng phap nay van dang dUpc sis

dung rong rai do tinh don gidn va do chfnh xdc

chap nhan dQOc trong bai toan hd 6io sdu. He

so nen la tham sd quan trong trong md hinh

dam tren nen dan hdi. Gia tn n^y thudng hen

he vdi dac trung dan hdi cua dat nen nhQ md

dun ddn hdi va he sd Poisson. Cd nhieu tac gici

da nghidn cdu va dUa ra bieu thdc h i sd nen

t d dcjn giSn nhuVesic [5], Ou [1], tuy nhien khi

ap dung cdc bleu thdc nay trong thuc hanh tfnh

to^n v^ so sdnh vdi phuong phdp phan t d hiJU

Tucrng chin

Nghiem Manh Hien

han hai chieu thi k^t qud sai l#ch ddng k^ [1]. fidl

bdo nay trinh bay phQcJng phdp Xciy dUng bieu

thO'c h i sd nen vdi muc tieu dat dQoc Id kit qud

phan tich theo phuong phdp dam trl n n^n ddn

hdi phu hop vdi ket qud phan tich theo phQong

phdp phan t d hQu han hai chieu.

2. Bil u thvTc h& so nin theo phiTOng

ngang

Xet can bang phan td dat ni n trong bii

todn tfnh todn tudng trong dat chiu tdi trong

ngang nhQ tren hinh ve 1.

PhQOng trinh can bdng phan td dSt theo

phuong true X la:

P-k,w5x= P

dP

'^dx"'

5x

(1)

Trong dd P la iQc tdc dung theo phUcMig

ngang; w la ehuyen vi ngang ddy phdn tdi; k^ Id

he sd nen trUot tai vj trf dang xix xdc dinh theo

bieu thdc:

k ArG, , G, (2)

Trong do j \dp dat ed phan td dang xi t G, vd H,

la md dun dan hoi trQot va chilu ddy tdp 6St thd

i; H^ la khoang each t d phan td den ddy ldp dit j ,

Phuong trinh (1) viet dQdl dang rOt gpn nhU

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