淋溪河水电站地下厂房开挖过程中材料敏感性的非线性有限元分析

Nonlinear finite element analysis of material sensibility in excavation process of underground pouerhouse of Linxi River Hydropower Station

根据淋溪河地应力实测值,应用多元线性回归方法获得了地下厂房区的初始地应力场,并在ABAQUS中实现了初始地应力的加载。考虑岩石节理,基于ABAQUS的UEL模块开发了界面单元子程序,在此基础上重点考察了地下厂房开挖过程中围岩应力场及位移场,对洞室围岩稳定性和材料敏感性进行了综合分析,结果表明淋溪河地下厂房洞室群围岩在各种分析工况下能维持稳定状态。

According to the initial stress field of the Linxi River rock masses,and based on the multiveariate linear regression method,the initial stress field of rock mass is obtained;its loading is and carried out in the software of ABAQUS.Considering the batholithic joint,the interface element functional element program is developed based on ABAQUS-UEL.Nonlinear finite element analysis is used to simulate the excavation unloading.Variations of displacement and stress field in different stages as well as the deformation regularity of different parts of rock masses in different material parameters are discussed.The results of FEA show that the rock stability can be kept in the process of excavation.