摘要
基于比奥固结理论,推导了考虑卸载和坑内外水头差影响的三维固结有限元方程,编制了考虑地下水渗流与土骨架变形耦合效应的有限元程序,研究了基坑变形以及坑内外超静孔隙水压力和土水势的时间效应。与不考虑坑内外水头差的情况对比表明,由于坑内外水头差的影响,基坑的围护结构变形、坑后地表沉降以及坑底隆起变形都增大,不考虑坑内外水头差影响的计算是偏不安全的。
Based on Blot＇s consolidation theory, the finite element equation of 3-D consolidation considering unloading and water head difference between inside and outside of the foundation pit is deduced and the corresponding computational program for FEM is developed, by which the coupled effect of seepage flow and soil deformation can be analyzed. The time effects of foundation pit deformation, excess pore pressure and soil water potential are investigated. The comparison of calculation results show that the horizontal displacement of retaining structure, the ground surface settlement as well as the pit base heave all will be bigger if the water head difference is taken into account.
出处
《水利学报》
EI
CSCD
北大核心
2006年第6期694-698,共5页
Journal of Hydraulic Engineering
关键词
时间效应
开挖
变形
水头差
渗流
time effect
excavation
foundation pit
soil deformation
seepage flow
water head difference
