地下厂房初始地应力简易FLAC3D反演方法  

A simple inversion method for initial ground stress of underground powerhouses based on FLAC3D

作　　者：周佐健 陈焕杰 罗滔 傅少君[3] ZHOU Zuojian;CHEN Huanjie;LUO Tao;FU Shaojun(Sinohydro Bureau 5 Co.,Ltd.,Chengdu 610066,China;College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;School of Civil and Architectural Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]中国水利水电第五工程局有限公司,四川成都610066 [2]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [3]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《武汉大学学报(工学版)》2024年第S2期11-15,共5页Engineering Journal of Wuhan University

基　　金：陕西省青年科技新星项目(编号:2022KJXX-85);中国水利水电第五工程局有限公司科研项目(编号:2022-05-030)

摘　　要：初始地应力场分布特征是影响地下厂房围岩稳定性的重要因素之一,为确保地下厂房在开挖支护过程中的围岩稳定和安全性,均需对围岩的初始地应力场进行反演。根据某抽水蓄能电站地下厂房实测地应力及工程地质资料建立三维数值模型,将初始构造应力简化为3类边界条件,并通过FLAC3D计算响应值,对响应值与实测值进行多元线性回归分析得到回归系数,从而实现地应力场的简易反演。结果表明,较少的工况可以节省大量计算,并且反演值与实测值拟合精度较高,满足工程要求。The distribution of the initial ground stress field is one of the important factors affecting the stability of the surrounding rock of underground powerhouses.In order to ensure the stability and safety of surrounding rock during excavation and support of underground powerhouses,it is necessary to invert the initial ground stress field of the surrounding rock.Based on the measured in-situ stress and engineering geological data of underground powerhouses of a pumped storage power station,a threedimensional numerical model is established.The initial tectonic stress is simplified into three types of boundary conditions,and calculated the response value by FLAC3D.The regression coefficient is obtained by multiple linear regression analysis between the response value and the measured value,so as to realize simple inversion of the initial ground stress field.The results show that the reduction of load conditions can save a lot of calculation,and the fitting accuracy of the inversion value and the measured value is high,which meets the engineering requirements.

关 键 词：地应力反演 多元线性回归 FLAC3D 

分 类 号：TU47[建筑科学—结构工程]