地震作用对Hoek-Brown准则下三维岩质边坡稳定性的影响

地震是滑坡灾害的重要诱导因素。对于满足Hoek-Brown破坏准则的三维岩质边坡,利用切线技术构建了非线性准则下三维破坏机制,基于拟静力法建立了地震作用下三维极限分析方法,开展了地震作用对三维岩质边坡稳定性影响研究。研究结果表明:边坡稳定性随着地震作用的增大而降低,地震作用的影响程度随着坡度和宽高比的减小而更显著;等效MohrCoulomb参数的取值会受到地震作用的影响,其影响程度随坡度的增大而减小;随着地震作用的增大,边坡最危险滑动面的位置变浅,其三维特性变弱。

Effects of Earthquake on the Stability of 3D Rock Slopes with Hoek-Brown Failure Criterion

Earthquake is an important inducement factor of the landslide hazard. For three-dimensional (3D) rock slopes, this study utilized the tangential method to establish the 3D failure mechanism with the Hoek-Brown criterion. The 3D limit analysis method considering the earthquake was conducted by using the pseudo-static approach. Investigations were made to assess the effects of earthquake on the 3D rock slope stability. The results indicate that the slope stability will reduce as the earthquake becomes bigger, and the effect degree will be more significant for slopes with smaller inclination or width constraint. The equivalent Mohr-Coulomb parameters are closely related to the earthquake, and the influence degree will decrease with the increasing inclination. As the earthquake becomes larger, the critical slip surface seems to be shallower and its 3D effect becomes weaker.