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通过对贵环高速公路顺层边坡现场工程地质条件的系统调查,在边坡岩体结构类型、结构面与坡面组合特征、稳定性影响因素分析的基础上,采用有限元数值模拟技术,结合工程地质条件分析,对其变形破坏机制及临滑宏观判据进行深入探讨。研究结果表明,边坡处于滑移拉裂型滑坡的加速蠕滑阶段,边坡变形受层间软弱夹层及岩体结构控制作用明显,临空面卸荷作用促使岩体张裂隙自软弱夹层处向坡顶面逐渐扩展并贯通,节理切割作用促使边坡滑移块体的形成,静水压力作用促使张裂隙自坡顶面向软弱夹层面逐步张开形成地表水下渗的通道,软弱夹层在地下水软化作用下促使边坡整体失稳,形成边坡滑塌区和变形区;该边坡局部失稳的临滑宏观判据为拉张裂缝距坡顶距离为8.0m,整体失稳的临滑宏观判据为拉张裂缝距坡顶距离为18.0m、滑移块体的厚度为16.0m、裂隙充水比例为80%,为该边坡的临滑预警提供了量化的宏观判据。
Based on the systematic investigation of geological conditions of on-site slope along Guihuan expressway, based on the analysis of the rock mass structure type, the combination of structural plane and slope and the influencing factors of stability, the finite element method Combined with the analysis of engineering geological conditions, the deformation and failure mechanism and the macro-criteria of temporary slip are discussed in depth. The results show that the slope is in the stage of accelerating creep of the sliding-pull-type landslide, and the deformation of the slope is controlled by the weak intercalation and the rock mass structure. The unloading of the caving surface promotes the expansion of the rock mass from the weak intercalation Gradually expands and penetrates to the top of the slope. The jointing and cutting action promotes the formation of slippery slope. The effect of hydrostatic pressure causes the fractures to open gradually from the top of the slope to the weakly intercalated surface to form the infiltration channel of surface water. Under the softening effect, the entire slope is instable, forming the landslide zone and the deformation zone. The local criterion for the local instability of the slope is that the distance between the top of the crack and the top of the slope is 8.0m, and the overall instability of the slope The macroscopic criterion is that the distance between the top of the crack and the top of the slope is 18.0m, the thickness of the slip block is 16.0m, and the proportion of water filling in the fracture is 80%, which provides the quantitative macroscopic criterion for the early slip of the slope.