基于JKR-Cohesion模型的湿颗粒松散堆积体滑坡模拟分析

Simulation Analysis of Wet Granular Loosen Deposition Landslide Based on JKR- Cohesion Model

为深入研究湿颗粒松散堆积体滑坡的运动特征,提出采用JKR-Cohesion模型模拟湿颗粒堆积体的运动行为。基于离散单元法(DEM)建立了三维松散堆积体滑坡水槽模型,模拟堆积体整个运移过程,并将计算结果与干燥颗粒堆积体运动结果进行对比。计算结果表明:湿颗粒松散堆积体的运动受水的粘附力影响很大,相对于干燥颗粒,运动速度最大值更小,运动时间更短,且大部分颗粒堆积在坡面上;湿颗粒堆积体在运动过程中解体为小团体单独运动,而干燥颗粒运动连续性好,运动距离更远。提出的方法对于含水堆土的滑坡模拟有一定借鉴作用。

In order to study the movement characteristics of wet granular deposition landslide further, JKR- Cohesion model was used to simulate the movements of the wet particles. Based on discrete element method( DEM), the three- dimensional landslide flume model was established to simulate the whole process, and the calculation results were compared by dry particles. The results show that: the movements of wet granular loosen body are effected by water adhesion deeply, and compared with the dry particles, it is obvious to conclude that the maximum velocity of wet particles is smaller, also with shorter travelling time, and most part of body deposit on the slope finally; wet granular body could break down into some small groups during the journey and move alone, but the movement of dry particles is continuous, and the traveled distance is also farther. The proposed method can provide some reference for the simulation of wet soil landslide.