岩石剪切破坏过程的RFPA^(2D)数值模拟

NUMERICAL SIMULATION ON FAILURE PROCESS OF ROCK SAMPLE WITH RFPA^(2D) CODE UNDER DIRECT SHEAR TEST

运用岩石破裂与失稳过程分析RFPA2D系统,对岩石剪切破裂过程进行了数值模拟研究。将剪切岩石视为非均匀弹-脆岩石材料,模拟结果再现了岩石剪切滑动形成从变形到破坏直至失稳的全过程,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,岩石剪切破裂面分形维数还对应着剪断面的粗糙程度和力学行为。

By using Rock Failure Process Analysis code (RFPA2D),the slip failure process of rock sample is numerically studied. The rock samples are considered as brittle and heterogeneous materials. The phenomena of progressive failure leading to collapse in sheared rock samples are numerically demonstrated. It is shown that shear face is the main feature of the slip failure mode. The shear face is initiated first in one side of the sample and to the center and then to another side. Finally,a macro shear face mode is observed and there are relationships between failure face fractal and mechanical behavior.