含结构面板岩变形特征分析

Analysis of Deformation Features of Slates with Structural Surfaces

在三轴压缩实验基础上,研究含一组结构面的板岩在不同湿度与压力下的力学特性及变形规律,利用Hoek-Brown强度准则分析了板岩的破坏特征,建立了相应的岩体强度准则与力学参数求取方法;利用FLAC程序模拟计算了不同埋深条件下板岩岩体中开挖隧洞后洞周变形规律,分析了岩体变形特征。研究结果表明:1)基于Hoek-Brown准则建立了含结构面的板岩岩体强度破坏准则,确定出的不同地质条件下板岩岩体力学强度参数;2)扰动程度对岩体强度参数有较大的影响,且影响程度随着隧洞埋深的增加而增大;3)数值模拟结果显示,西线工程软岩隧洞的围岩变形主要受开挖断面、埋深及物理力学参数等多因素的影响。

Deformation features in slates with one structural surfaces were studied by triaxial compression experiments under different confining pressures.The failure features were analyzed by using Hoek-Brown criterion and then the constitutive relationship and mechanical parameters were gained.On the basis of numerical simulation with FLAC3D,the deformation of slates rocks in different depths around the digging tunnel were studied.The following conclusions were drawn from the analysis： 1） failure strength criteria with single discontinuity was obtained by using Hock - Brown criterion, then mechanical parameters under different conditions can be calculated ; 2 ） disturbing degrees affected the mechanical paremeters greatly, which are similar to the effects of tunnel depths on the parameters ; 3 ） numerical simulation results showed that deformation of surrounding rocks in western projects were affected by such factors as depth, radius of excavation profiles and physical and mechanical parameters.