热-应力耦合作用下深部软岩隧洞大变形三维数值模拟分析

高地温是深部隧洞的一个重要特点,温度场的存在必然会影响到深部隧洞的变形和应力状况,特别是考虑到深部隧洞的高地应力和大变形的特性,温度场的影响就更加显著。因此,本文基于摩尔-库仑本构模型,利用FLAC3D软件对深部软岩隧洞洞室围岩的力学响应及其在不同温度场作用影响下的应力、变形及塑性区分布等指标的分布及变化情况进行模拟计算及研究分析,得出了一定基本规律,为工程设计提供参考。

3-Dimension numerical simulation analysis for large strain of deep soft rock tunnel under thermo-mechanical coupling effect

High ground temperature is an important feature of deep tunnel,and the existing temperature field is sure to affect the strain and stress of the deep tunnel,especially,the effect of temperature field will be remarkable in view of the high ground-stress and high temperature of deep tunnel.Based on the Mohr-Coulomb constitutive theory,FLAC3D software was used to conduct simulation calculation and study of the mechanical response of the wall rock of deep soft rock tunnel and distributed and changed conditions of the stress,strain,and plastic region and so on under different temperature fields,certain basic rules were gained and they can be of good reference value for engineering design.