Numerical analysis on dynamic characteristics of Zhonghai Village landslide in Hanyuan County of Sichuan Province
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摘要: 通过对中海村滑坡灾害现场的调查研究,阐明了滑坡的致灾因素和失稳机制,基于连续介质力学理论数值模型对滑坡进行了动力参数反演分析。研究结果表明: 连续降雨和第四系昔格达半成岩的特殊岩性特征是中海村滑坡发生的关键因素,滑坡运动持续时间约70 s,滑坡孔隙水压力系数为0.8,最大堆积厚度为8 m,最大运动速度为16.2 m/s; 在整个滑坡运动形态和速度演化过程中,主要堆积区域为1级平台和3级平台,运动速度出现3峰特征,阶梯型地形是出现阶段性速度峰值的主要原因。Abstract: The disaster-causing factors and the instability mechanism of the landslide are clarified through the on-site investigation of the landslide disaster in Zhonghaicun area in this paper. And the dynamic parameter inversion analysis of the landslide is carried out based on the numerical model of the continuum mechanics theory. The results show that the continuous rainfall and the special lithological characteristics of the Quaternary Sigda semi-diagenetic rocks are the key factors for the occurrence of Zhonghaicun landslides. The landslide movement lasts about 70 s, and the pore water pressure coefficient of the landslide is 0.8, with maximum accumulation thickness of 8 meters and maximum movement velocity of 16.2 m/s. In the entire process of landslide movement form and velocity evolution, the main accumulation areas are the 1st-level platform and the 3rd-level platform. The movement speed has three peaks, and the stepped terrain is the main reason for the staged speed peaks.
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