Base stability analysis of braced deep excavation in undrained anisotropic clay with upper bound theory  

作　　者：WANG LiZhong LONG Fan 

机构地区：[1]College of Civil Engineering and Architecture, Zhejiang University

出　　处：《Science China(Technological Sciences)》2014年第9期1865-1876,共12页中国科学（技术科学英文版）

基　　金：supported by the National Science Foundation for Distinguished Young Scholars of China(Grant No.51325901);the State Key Program of National Natural Science of China(Grant No.51338009)

摘　　要：It is imperative to evaluate factor of safety against basal heave failure in the design of braced deep excavation in soft clay.Based on previously published field monitoring data and finite element analyses of ground settlements of deep excavation in soft clay,an assumed plastic deformation mechanism proposed here gives upper bound solutions for base stability of braced deep excavations.The proposed kinematic mechanism is optimized by the mobile depth(profile wavelength).The method takes into account the influence of strength anisotropy under plane strain conditions,the embedment of the retaining wall,and the locations of the struts.The current method is validated by comparison with published numerical study of braced excavations in Boston blue clay and two other cases of excavation failure in Taipei.The results show that the upper bound solutions obtained from this presented method is more accurate as compared with the conventional methods for basal heave failure analyses.

关 键 词：braced deep excavation base stability upper bound theory soil anisotropy 

分 类 号：TU470[建筑科学—结构工程]