初始和改变地形条件下岩质边坡稳定性评价

Rock Slope Stability Analysis Under Initial and Modified Topography Condition

岩质边坡大多地处高山峡谷地区,地形较陡,地质情况复杂,其稳定性评价问题较难。选择典型地质剖面,对该高陡边坡的稳定性进行了探讨。根据设计的剪出口高度、不同结构面切割岩体厚度计算工况,确定该岩质边坡的滑移模式和最不利破坏面。在此基础上,计算其在自然状态、自然+地震、饱水状态和饱水+地震条件下的稳定性,结果表明在饱水+地震条件下的稳定性不满足工程稳定性要求;研究了发生滑坡改变地形条件下该地段的稳定性,为治理和工程选址提供了依据。

Most of rock slope locate in alpine valley region,whose terrain is very steep and geology condition is complicated.So,the slope stability problem is particularly difficult.The typical geological section is selected to discuss the stability of the high and steep rock slope.The slipping mode and destruction plane of the most disadvantaged are determined under computing schemes of cut export height and different rock thickness cutting by fissure plane.Based on these,its stability under natural condition,natural and seismic condition,saturated condition,saturated and seismic condition is computed and analyzed.It is found that the stability of the rock slope under saturated and seismic condition isn＇t met the requirement of the engineering safety grade.Finally,the stability of the slope under modified topography condition is researched,which offers foundation for governance and selection of project site.