期刊论文

Influence of foundation excavation pit on adjacent metro tunnel using fluid-solid mechanics theory

Huang, K.

中文

中南大学学报(自然科学版)

1672-7207

2019

50

1

198-205

10.11817/j.issn.1672-7207.2019.01.025

国家自然科学基金资助项目（51408216）； 湖南省教育厅科学研究重点项目（2018）； 长沙理工大学“双一流”科学研究国际合作拓展项目（2018IC19）;长沙理工大学土木工程优势特色重点学科创新性项目（18ZDXK05）~~；

本校为第一且通讯机构

基于流固耦合理论,采用修正摩尔库仑本构关系,建立三维仿真模型,分析渗流特性、基坑开挖过程、不同降水速度下基坑施工特性以及其对邻近地铁的影响,并与实际监测结果进行对比分析。研究结果表明:土体渗流呈现空间差异性与时间差异性;基坑内降水速度对基坑外侧的地层变形影响较小;随开挖深度增大,土体位移增大,排桩水平位移总体上大于竖向位移;应力集中造成的基坑角部弯矩较大,在工程实践中应设置角部支撑分散应力集中产生的不利影响;锚固单元体系安全系数可满足设计要求;地铁区间隧道形状呈扁平状的椭圆形发展,隧道顶部及左右侧腰部受力较大,在设计施工中应进行配筋等加强处理;基坑开挖降水引起...

Based on the fluid-solid coupling theory, the modified Mohr-Coulomb constitutive relationship was adopted to establish a three-dimensional simulation model. The seepage characteristics, deformation and stress characteristics of foundation pit and adjacent subway during excavation under different speed dewaterings were analyzed, and they were compared with the actual monitoring results. The results show that soil seepage exhibits spatial difference and time difference. The precipitation speed has little effect on the deformation of the stratum a...