软土地区地铁基坑插入比优化研究  

Research on Optimization of Embedment Ratio of Subway Foundation Pit in Soft Soil Areas

作　　者：李璐娴 贾鹏蛟 申晓明 吴奔 史培新 LI Luxian;JIA Pengjiao;SHEN Xiaoming;WU Ben;SHI Peixin(School of Rail Transportation,Soochow University,Suzhou,Jiangsu 215000,China;Suzhou Rail Transit Group Co,Ltd.,Suzhou,Jiangsu 215004,China)

机构地区：[1]苏州大学轨道交通学院,江苏苏州215000 [2]苏州轨道交通集团有限公司,江苏苏州215004

出　　处：《河北工程大学学报（自然科学版）》2023年第3期77-83,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：中国博士后科学基金面上资助项目(2021M702400);国家自然科学基金青年项目(52108380)。

摘　　要：以苏州地区地铁基坑工程为研究背景,结合实际工程数据与数值模拟结果,分析插入比和基坑稳定与变形的关系。通过数值仿真明确基坑隆起失效时滑动面位置及其与插入比和基坑深度的关系,提出了确定滑动面位置的计算公式,改进了抗隆起稳定性分析中圆弧滑动法的滑动半径。结果表明:建立的滑动面位置确定公式可以较准确地预测苏州基坑隆起失效时滑动面位置;在此基础上,改进的隆起稳定性计算方法所确定的插入比与现有地基承载力法的计算结果吻合度较好,相较于传统圆弧法得到的插入比降低了41%,优化了地铁基坑支护结构的插入比设计。Based on the research background of Suzhou Metro foundation pit engineering,combined with the actual engineering data and numerical simulation results,the relationship between the embedment ratio,stability and deformation of foundation pit was analyzed.Through numerical simulation,the position of the sliding surface and its relation with the embedment ratio and the depth of the foundation pit were clarified.The formula for determining the position of the sliding surface was derived,and the sliding radius of the circular sliding method was improved in the analysis of basal heave stability.The results show that the formula for determining the position of sliding surface can accurately predict the position of the sliding surface when Suzhou foundation pit fails by basal heave.On this basis,the embedment ratio determined by the improved calculation method of basal heave stability is in good agreement with the calculation results of the existing foundation bearing capacity method,which is 41%lower than the embedment ratio obtained by the traditional circular sliding method.The embedment ratio design of the subway foundation pit supporting structure is optimized.

关 键 词：地铁基坑 插入比 抗隆起稳定性 数值模拟 理论分析 

分 类 号：TU471[建筑科学—结构工程]