节理分布对岩体破坏影响的数值模拟研究

Numerical Simulation on Influence of Joint Distributions on Failures of Rock Mass

为研究含断续节理岩体的宏观破坏过程和特征,采用岩石破裂过程分析RFPA2D系统,分析了断续节理岩体中裂纹的产生、扩展机理与过程.结果表明,当节理倾角从30°,45°到60°时,岩体强度从小到大增加,并且破坏前期的声发射现象增强、变形增大;随着节理密度的增大,裂纹的产生从互不影响到相互抑制,裂纹扩展长度减小;中间节理受压剪作用很快与相邻节理贯通导致节理岩体破坏.据此,明确界定断续节理产生贯通破坏的范围就是围岩破裂区.

To study the failure process and characteristic of rock mass containing intermittent joint, the cracking initiation mechanism and extending process of intermittently jointed rock mass were simulated using software RFPA^2D. mass increases when the joint angles changed The results show that the strength of the rock from 30°, 45° to 60°, the deformation increases and the sound emission boosts up in the prophase of the rock failure. The cracking initiation actions change from independence to interaction and the cracking propagation length decreases when the joint density increases. The middle joints quickly connect to the adjacent joints with the action of compression-shear stress, which results in the rock failure. The broken rock zone is the range where the intermittent joints connect.