云南民族大学学报（自然科学版）2017，Vol.26Issue(1)：89-94,6.DOI:12.3969/j.issn.1672-8513.2017.01.018
考虑渗流应力耦合作用的深基坑开挖变形研究
Excavation deformation of the deep foundation pit in the perspective of coupling seepage-stress effects
摘要
Abstract
The three-dimensional finite element model of one selected deep foundation pit excavation was built based on the seepage-stress coupling effects and constitutive theory of soil.Thick silty clay and clay are distributed in the foundation pit where the groundwater level is higher.The modified Cam-clay model parameters of the foundation soil were determined by the laboratory test,and the modified Cam-clay model was applied to the numerical simulation analysis of the excavation support of this foundation pit.The deformation of the foundation pit,the horizontal displacements of the supporting structure,the ground settlement,and the excavation rebound are researched respectively during the excavation of the deep foundation pit coupling with the effect of seepage-stress or not.The results go as follows:(1) It is suitable to use the modified Cam-clay model for watery silty clay and clay.(2) When the coupling effect of the seepage-stress interaction during the foundation pit excavation is taken into account,the horizontal displacements of the supporting structure,the ground settlement and the excavation rebound of the foundation pit are 0.57 times,0.07 times and 0.59 times respectively compared with the situation of ignoring the coupling effect of the seepage-stress interaction during the excavation of the foundation pit.The coupling effect of the seepage-stress interaction should be fully considered during the analysis of the excavation deformation of the foundation pit.3) Precipitation at the bottom of the pit in advance can reduce the excavation rebound significantly.关键词
深基坑/开挖变形/修正剑桥本构关系/渗流-应力耦合效应/数值模拟Key words
deep foundation pit/excavation deformation/modified Cam-clay model/coupling seepage-stress effect/numerical simulation分类
建筑与水利引用本文复制引用
汪慧莲,谢建斌,吴晓敏,王立娜,窦法楷,刘秦南..考虑渗流应力耦合作用的深基坑开挖变形研究[J].云南民族大学学报（自然科学版）,2017,26(1):89-94,6.基金项目
国家自然科学基金(51264037) （51264037）
云南省应用基础研究计划面上项目(2012FB117) （2012FB117）
云南省教育厅科学研究基金(2015Y197). （2015Y197）
