岩土工程学报2024，Vol.46Issue(7)：1516-1524,9.DOI:10.11779/CJGE20230570
基坑近接地铁车站主动土压力合力算法研究
Algorithm for resultant force of active soil pressure of excavations adjacent to underground subway stations
摘要
Abstract
Aiming at the problem of complex formula for calculating the resultant force of active soil pressure of limited soil,based on the newly built excavations in the vicinity of subway stations,multiple limited soil failure modes are proposed based on the positional relationship between the existing subway stations and the excavations.The thin-layer microelement method is used to consider the frictional effects between the soil and the structural interface,and a method for calculating the combined force of active soil pressure is established.By adjusting the spatial position relationship between the newly built and existing structures,an active soil pressure contour map is obtained,and the parameter analysis is conducted.Furthermore,a simple calculation method for active soil pressure is put forward.The research results indicate that:(1)Five finite soil failure modes are proposed,and the corresponding formulas for calculating the active soil pressure are established.(2)As the proximity distance increases,the active soil pressure gradually increases.As the thickness of the existing subway station cover increases,the active soil pressure gradually increases when approaching the excavation,and the active soil pressure on the side far from the excavation pit first increases,then decreases,and finally increases.(3)The depth of the excavation has a significant impact on the active soil pressure,the internal friction angle has an impact on the active soil pressure,and the wall-soil friction angle has basically no effect on the active soil pressure.(4)The value of the spatial position relationship coefficient of the combined force of active soil pressure is given.Through the above research,a simple method for the combined force of active pressure of limited soil is proposed to provide reference for the design and construction of adjacent projects.关键词
基坑工程/近接工程/有限土体/主动土压力/等值图Key words
excavation engineering/adjacent project/limited soil/active soil pressure/contour map分类
建筑与水利引用本文复制引用
张振波,黄安,周佳迪,刘志春,孙明磊..基坑近接地铁车站主动土压力合力算法研究[J].岩土工程学报,2024,46(7):1516-1524,9.基金项目
国家重点研发计划课题(2018YFC0808703) （2018YFC0808703）
河北省高等学校科学技术研究项目(QN2021130) （QN2021130）
