随机形貌岩石节理剪切破坏分析

Shear failure analysis of rock joint with random morphology

基于三维高精度形貌扫描技术和节理剪切试验及数值模拟,研究随机形貌岩石节理剪切的节理表面破坏过程及机理。利用自定义参数(节理面破坏量Vd、破坏增量Vd-inc)定量分析节理面破坏过程,并基于节理表面破坏特征将随机形貌岩石节理剪切破坏过程细化为6个基本阶段。研究结果表明:节理表面破坏开始于破坏起始阶段,主要发生在整体破坏阶段,节理面整体破坏阶段的破坏量占整个剪切过程总破坏量的70%以上。节理表面破坏主要为剪胀伴随凸起体顶部剪断和沿凸起体根部剪断,前者比后者更迅速。节理面凸起体根部易产生拉伸裂纹,但整体破坏形式以剪切破坏为主。

The shear failure process and mechanism of Joint surface with random morphology rock joint was investigated, based on 3D high precision morphology scanning technique and joint shear test and numerical simulation. Damage evolution process of joint surface was quantitative analysis using the failure quantity (Vd) and the failure increment (Vd-inc), and the shear process of random morphology rock joint was divided into six basic stage based on the joint surface damage evolution characteristics. The results show that the joint surface damage begin in initial stage of destruction, and mainly in the whole failure stage, joint surface damage in the whole failure stage account for more than 70% of the whole shear process. Joint surface damage mainly the dilation with shearing at the top of the convex and the shearing along the convex root, and the former is more rapid than the latter.