直剪状态下裂纹扩展过程的数值分析

Numerical Analysis of Crack Propagation Process under Direct Shear Test

运用岩石破裂与失稳过程分析RFPA2D系统 ,对直剪状态下裂纹扩展及其力学行为进行了数值模拟研究。岩石试样视为非均匀性损伤岩石材料 ,模拟结果再现了裂纹扩展形成和试样从变形到破坏直至失稳的全过程及其特有的力学特性。结果表明 ,剪断面是滑动形成的主要形式 ,并首先在试样一端出现 ,然后再形成由一端及里的剪断面扩展直至另一端最后产生剪断面破坏贯通 ,形成统一的滑动面。

Using a Rock Failure Process Analysis code(RFPA 2D ), crack propagation and mechanical behavior were numerically studied under direct shear test. The rock samples were considered as brittle and heterogeneous materials. The phenomena of progressive failure leading to collapse and inducing seismicity in rock samples were numerically demonstrated and shown with proper mechanical behavior. It is shown that shear face is the main feature of the slip failure mode. The shear face initiated first in the one side of the slip, then in the center and last to another side. Finally, a macro shear face mode was observed.