堆载诱发型滑坡变形演化机理的模型试验研究

Model Test Study of Deformation Mechanism of Landslide Induced by Loading

基于模型试验,对堆载诱发型边坡滑坡的变形机理及演化过程进行研究。研究结果表明:(1)堆载诱发型滑坡的变形演化规律可归纳为:后缘压缩阶段→蠕动变形阶段→加速滑动阶段→剧滑阶段,且剧滑启动之前的加速变形过渡时间极短;(2)利用FLAC3D软件进行堆载滑坡演化过程的动态数值分析,模拟过程中坡体应力场和位移场的演化特征表现为从上向下逐步贯通,与模型边坡破坏过程相符;(3)堆载诱发型滑坡破坏过程历时短、突发性强,在坡脚产生持续位移时即应做出滑坡预警。

Based on the model test, this paper studies the deformation mechanism and evolutionary process of landslide induced by accumulation load. The research results indicate that：（1） the evolutionary process of landslide induced by loading can be summarized as： trailing edge compression phase→ creeping slip phase→accelerated slip phase→overall slip phase, the transition time of accelerated deformation before overall slip was very short. （2） the evolutionary process is simulated by FLAC3D, the evolutionary characteristics of stress field and displacement field are consistent with the model test, characterized by damaging from top to bottom gradually. （3） the failure process of landslide induced by loading has short duration and strong burst, therefore early warning should be sounded when continuous displacement at slope toe occur.