摘要
为研究渗流与蠕变的相互耦合作用对软土基坑开挖的影响,文章以深圳地铁11号线前海湾站基坑工程为背景,基于FLAC3D中的渗流和蠕变分析模式,对不同计算条件下软土基坑的桩后水压力、桩位移、地表沉降以及坑底隆起等的变化规律展开研究。研究结果表明:(1)渗流和蠕变作用均会对基坑开挖变形产生较大影响,只有综合考虑这两者间的相互影响,才能保证基坑开挖模拟计算结果与实际相符合;(2)基坑开挖过程中,基坑两侧桩最大位移值和位置都与开挖时间呈指数衰减关系,而基坑两侧地表最大沉降除会在每次降水过程中急速增大外,其余时段则与开挖时间保持相对缓慢的线性增长关系;(3)随着潜水水位埋深的增加,基坑两侧地表最大沉降和桩体最大位移都将线性减小。
In order to study the coupling effect of creep and seepage on foundation excavation in soft soil,a study on the water pressure,pile displacement,ground surface settlement and bottom heaving of soft soil foundation pit af⁃ter piling under different calculation conditions are conducted based on creep and seepage analysis modes of FLAC3D by taking the Qianhaiwan station excavation of Shenzhen metro Line 11 as the background.The results show that:(1)both seepage and creep have significant impact on deformation of foundation pit and the mutual effect must be considered so as to ensure the simulated results comply with the actual results;(2)during foundation pit excava⁃tion,the values and positions of maximum pile displacements at both sides of foundation pit are of exponential decay relationship to excavation time,while the values of maximum ground surface settlement are of slow linear growth re⁃lationship to excavation time except for rapid increasing in the course of dewatering;(3)with the increase of phreatic water level,the maximum pile displacements and the maximum ground surface settlements at both sides of founda⁃tion pit decrease linearly.
作者
林志斌
张勃阳
杨大方
LIN Zhibin;ZHANG Boyang;YANG Dafang(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000)
出处
《现代隧道技术》
EI
CSCD
北大核心
2020年第1期91-98,共8页
Modern Tunnelling Technology
基金
国家自然科学基金(51708185)
河南理工大学博士基金(B2017-51)
关键词
富水软土基坑
蠕变
渗流
FLAC^3D
潜水水位
基坑变形
Foundation pit in water-rich soft soil
Creep
Seepage
FLAC3D
Phreatic water level
Deformation of foundation pit
