岩体结构对工程滑坡稳定性的影响分析

Influence of rock structure on the stability of an engineering landslide

在对兰州市某滑坡的自然形态、地质特征及滑坡变形特征的分析中,发现原边坡在开挖条件下稳定性较好,通过限定条件的二维刚体极限平衡原理进行滑坡稳定性安全系数计算,证明岩体结构因素对该滑坡的失稳滑动起关键性作尉.借助赤平投影图对结构面组合与边坡坡面的空间关系进行直观的解析,证明该种岩体结构对边坡稳定非常不利,解释了边坡的失稳原因.通过工程实例指出目前滑坡稳定性分析存在的问题,为岩体结构条件特殊的滑坡稳定分析提供了新思路.

According an analysis and survey of the natural form, geological and deformation characteristics of a landslide in Lanzhou City, the stability of its original slope under the condition of excavation was good. By using the restricted condition 2D rigid limit equilibrium theory to calculate landslide stability factors, it was found that the rock structure played a key role in the destabilizing process of the landslide. By means of stereographic projection, the spatial relationship between combinations of structure surface and slope surface was determined intuitively, proving that this kind of structure is negative to the stability of the rock slope and giving reasons behind the slope instability. According to the engineering example, problems with the progress of landslide stability are pointed out, which can provide a new idea for analyzing the stability of landslides with special rock structures.