【摘要】 利用FLAC3D软件对四川省雅安市汉源县二蛮山滑坡坡体进行建模,模拟降雨滑坡过程,并进行应力应变特征及稳定性计算分析,从而为深入研究地震及降雨诱发再次滑坡及防灾减灾提供可靠依据。研究中假设地震工况,对边坡进行详细的动力分析,得到了各监测点动力特征曲线;通过降雨工况下坡体稳定性系数分析得到了不同强度折减安全系数。研究结果表明,滑源区相对特殊的地形条件和地质构造以及不利的结构面组合是滑坡的基础;前期强降雨期间饱水加载以及大量雨水沿斜沟张裂结构面的下渗软化作用,是诱发滑坡发生的关键因素。更多还原

【Abstract】 In this paper,the FLAC3D software was used to establish the model of Ermanshan Mountain in Hanyuan County,Ya’an City,Sichuan Province and to simulate the rainfall landslide process.The stress-strain features and slope stability were calculated and analysed in order to offer a reliable basis for the prediction of second landslide induced by earthquake and disaster prevention and reduction.Under the assumption of earthquake condition,the experiment detail analysed the dynamic characteristics of the side slope and obtained the dynamic characteristic curve of the monitoring points.Under the assumption of rainfall condition,the safety coefficient table with different strength reductions was acquired based on the stability analysis of the slope.Researches showed that the relatively special terrain conditions,geological structure and unfavourable structural surface combination were the basis of the landslide.Saturated water loading and the infiltration softening effect of a large amount of water along the oblique groove tension crack structural plane during the earlier heavy rainfall were the key factors causing landslide.更多还原