岩土基坑开挖过程中的周围土体渗流-应力耦合模型  

Seepage-stress coupling model of surrounding soil during excavation of geotechnical foundation pit

作　　者：安宏科[1] 唐东升 AN Hongke;TANG Dongsheng(Shaanxi Railway Institute,Weinan 714000,Shaanxi,China;China Railway 20th Bureau Group First Engineering Co.,Ltd.,Suzhou 215151,Jiangsu,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]中铁二十局集团第一工程有限公司,江苏苏州215151

出　　处：《矿产与地质》2023年第1期171-176,共6页Mineral Resources and Geology

基　　金：陕西铁路工程职业技术学院校级课题“岩土基坑降水及开挖过程中的土体渗流应力耦合模型研究”(编号:KY2022-41)资助。

摘　　要：传统渗流-应力耦合模型仅考虑土体的各向同性特征,忽略了工程中应力与渗流的非线性影响,导致计算结果与实际情况偏差较大,由此,设计一种岩土基坑开挖过程中的周围土体渗流-应力耦合模型。搭建测试装置,利用瞬态试验法测定岩土基坑周围土体渗透率,分析岩土基坑周围土体基质块微观结构,得到土体变形方程并求解;从宏观角度分析土体应力,得到应力边界的面力结构,构建土体渗流-应力耦合模型。根据实际情况设定工程边界条件,选择某建筑工程中岩土基坑作为分析实例,测试结果表明,该模型计算结果与实际情况的误差低于0.2 m,可以为岩土基坑开挖提供参考。The traditional seepage-stress coupling model only considers the isotropic characteristics of the soil,ignoring the nonlinear effect of stress and seepage in the project,resulting in a large deviation between the calculation result and the actual situation.Seepage-stress coupled model of surrounding soil is designed in the process.A test device is set up,and the transient test method is used to measure the permeability of the soil around the rock-soil foundation pit,the microstructure of the soil matrix block around the rock-soil founda-tion pit is analyzed,the soil deformation equation is obtained and it is solved.The soil stress is analyzed from a macro perspective to obtain the stress.The surface force structure of the boundary is used to construct a coupled soil seepage-stress model.The boundary condition of the project is set according to the actual situa-tion,and the rock and soil foundation pit in a construction project is selected as an analysis example.The test result shows that the error between the calculated result of the model and the actual situation is less than 0.2m,which can provide a reference for the excavation of rock and soil foundation pit.

关 键 词：岩土基坑 渗流-应力耦合模型 渗透率 渗流控制方程 应力分析 孔隙模型 

分 类 号：P642[天文地球—工程地质学]