不排水双层粘土地基承载力的强度折减有限元分析 - 福州大学学报.pdf

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