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34 4 ( ) Vol. 34 No. 4
2006 8 Journal of Fuzhou University( Natural Science) Aug. 2006
: 1000- 2243( 2006) 04- 0589- 05
1 1, 2 1
, ,
( 1. , 350002; 2. , 350007)
: ,
, . ,
, Plaxis8. 2 , , Prandtl
, , .
, .
: ; ; ;
: TU431 : A
Numerical analysis for bearing capacity of undrained two- layer clays
by FEM with strength reduction
1 1, 2 1
L A- chi , CHEN Fu- quan , L U Yu- chuan
( 1. College of Civil and Architecture Engineering , Fuzhou University, Fuzhou, Fuj ian 350002, China; 2. Depart
ment of Civil Engineering , Fujian College of Engineering, Fuzhou, Fujian 350007, China)
Abstract: Classical theory formulae of ultimate bearing capacity are considered only applicable to homo
geneous ground. For nonhomogeneous ground of two- layer soils, there is a more reasonable and rigorous
method based on finite element method with strength reduction. Plaxis8. 2, a finite element software for
geotechnical engineering, is able to calculate safety factor of foundations by finite element method with
strength reduction. By comparing to Prandtl s solution, the precision of plaxis is considered well sat isfy
ing. Then plaxis was used to building the model of undrained two- layer soils clays and educed ultimate
bearing capacity which is related to the thickness of upper layer and the strength of sublayer. Based on
the results, the influence factor and characteristic of ultimate b
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