降雨诱发含后缘裂缝岩质边坡失稳机制研究

为探讨降雨诱发边坡失稳机制，以突变理论为基础，综合考虑边坡滑体后缘裂缝静水压力、滑动面水压力和水致弱化的影响，推导了坡体突变失稳的力学判据。研究结果表明:降雨作用下岩质边坡失稳与后缘裂缝充水高度、水致弱化函数、滑体几何-力学参数有关；裂缝与滑动面导通后，坡体发生突变失稳的必要条件为水致弱化段长度远大于弹性段长度；裂缝充水高度d越大，水致弱化函数f(ω)越小，发生失稳可能性越大。

The research on instability mechanism of rock slope with trailing edge cracks induced by rainfall

To investigate the mechanism of rainfall induced slope instability, based on the catastrophe theory, which the influences of hydrostatic pressure, water pressure of sliding surface and water induced weakening on the crack at the back edge of the slope sliding body are comprehensively considered. the mechanical criterion for sudden failure of slope is derived.Results show that the instability of rock slope under rainfall is related to the water filling height of the trailing edge crack, the water induced weakening function and the geometric mechanical parameters of the sliding body. After the crack penetrated with weak intercalation, it is necessary for the catastrophe instability of the slope that the length of the weakening section of the water induced damage is much larger than the length of the elastic section. The larger the crack filling height d, the smaller the water induced weakening function f(ω), the greater the possibility of instability.