席家院子滑坡形成机理与稳定性评价

Formation Mechanism and Stability Evaluation of Xijiayuanzi Landslide

席家院子滑坡位于四川省广安市华蓥市,为一"浅层土质牵引式滑坡总方量约5.5×10~4m^3,该滑坡主要威胁对象为滑坡体前缘的28户112人的生命安全及基础水利、电力设施和公路安全,威胁资产约500万元。本文在充分收集相关资料的基础上,论述了滑坡区的工程地质特征,研究了滑坡的发育特征和形成条件,分析了滑坡的演化机理及变形破坏特征。通过经验、试验及反演计算综合确定了滑坡岩土体物理力学参数,并采用极限平衡法对滑坡在自然工况,暴雨工况、地震工况等3种不同工况下的稳定性做出了评价。为该滑坡体后期开展治理工作,提供了必要的依据。

Xijiayuanzi landslide, located in Huaying County of Guangan City of Sichuan Province, is a retrogressive landslide with shallow soil property. The total volume of the landslide mass is approximately 5.5×104 m3. The below area of landslide includes a settlement with 112 persons, and road, electric power, water conservancy facilities. The potential economic losses are about 5 million yuan. Based on the data collected, the engineering geologic characteristics, development character, and formation condition of the landslide were presented, and the formation mechanism and deformation characteristics were analyzed.The physics and mechanics parameters were determined by experience, test and inversion calculation. And the limit equilibrium method was used to evaluate the stability in different working conditions, including nature, heavy rain and earthquake. The results obtained by the authors may provide a basis for the landslide remediation.