两家人水电站滑石板顺层岩质边坡滑坡机理数值模拟

滑坡地质灾害影响因素众多、机理复杂,单纯采用地质分析缺少依据。基于云南省金沙江两家人水电站左岸滑石板顺层岩质边坡在1996年10月28日发生滑坡的事实,在大量地质勘查基础上,采用简易滑块对滑坡机理进行了探讨,并利用颗粒离散元数值模拟方法,建立了满足滑体与滑面特性的滑坡模型,通过一系列的滑坡数值模拟试验,探讨了滑面摩擦系数、滑体强度等因素对滑坡堆积、块度、滑坡速度的影响规律,对比后期的勘查成果对当时滑坡情况进行了反馈分析。该方法可为后续滑石板边坡的稳定性研究及灾害预测提供理论依据。

Numerical analysis on landslide mechanism of a talc sheet rock slope at Liangjiaren hydropower station

Landslide disaster is one of the most frequently happening geological disasters, the process of which is governed by terrain geometry, characteristic of landslide rock mass, characteristic of slip surface and external environment loads such as earthquake, rainstorm and human activity. Based on the fact of landslide disaster at bedding rock slope of left bank of Tiger-leap-Gorger at Liangjiaren hydropower station, on October 28,1996, a landslide model was built up to fit the slide rock mass, slip face, as well as the effect of earthquake and rainstorm according to a large number of geological surveys. Then a series of numerical simulation of landslide was proposed to study the influencing rules of slip friction coefficient and strength of slide rock mass on the landslide geometry, debris size and velocity of landslide, so the process of landslide of bedding rock slope was feedback analyzed and the slope stability was discussed. This method could be used in following stability research of similar slopes and corresponding assessment of geological hazards.