基于强度折减法某涉水滑坡稳定性评价

Strength reduction evaluation based on a wading landslide stability

水位升降对松散堆积层滑坡的稳定性起控制作用，堆积体发生复活是滑坡灾害的一种重要的形式，因此，对准确评价该类滑坡的稳定性显得尤为重要，这也直接关系到工程处治措施的选取。以某涉水滑坡发生复活为研究对象，根据该涉水滑坡的坡体结构特征及变形破裂特征，对该滑坡的复活机制进行分析，在此基础上采用有限差分强度折减法对其进行稳定性评价，结果表明在自重状态下当折减到一定数值时，滑坡发生明显的变形破裂特征，塑性区逐渐贯通形成潜在滑面，这与现场地质调查及钻探资料分析的结果基本相吻合。另外，采用基于极限平衡法对该涉水滑坡进行稳定性评价，其计算结果与强度折减法基本一致，这也验证了有限差分强度折减法对滑坡稳定性评价的可靠性。

Water level of loosely packed layer of landslide stability in control, the resurrection of the pile is a landslide disaster occurred in the form of important, therefore, to accurately evaluate the stability of such landslides is particularly important, which is directly related to the project Treatment select the measure. In this paper, the resurrection as the research object to a wading landslide,according to the structural features of the slope and the wading landslide deformation and fracture characteristics, the resurrection of the landslide mechanism is analyzed on the ba- sis of strength reduction finite difference be stable evaluation results show that when the state under its own weight when the reduction to a cer- tain value,the obvious landslide deformation and fracture characteristics of the plastic zone gradually through a potential slip surface,which re- suits with field geological survey and drilling data analysis basically coincide. In addition, based on the limit equilibrium method wading landslide stability evaluation, the calculation results are basieally consistent with the strength reduction, which also verified the strength reduction finite difference evaluation of landslide stability and reliability.