基于离散元法的偏转型滑坡运动堆积特征分析

为了进一步认识山阳偏转型滑坡的运动特征,基于离散元数值方法对滑坡运动堆积过程进行模拟分析。结果表明:滑坡体前缘各监测点的岩土体的运动空间大小、能量传递效率及受到偏转阻止作用大小的不同是前缘岩土体运动速度表现出显著差异的主要原因;滑坡体中部各监测点的岩土体作为滑坡前、后缘岩土体能量传递的主要媒介,其运动速度表现出多次加速特征;滑坡体后缘各监测点的岩土体则主要经历加速和减速2个运动阶段。根据滑坡的运动速度和水平运程可将山阳滑坡划分为高速近程滑坡,其堆积体厚度分布总体表现为沿运动方向呈先增加后减小的变化趋势。

DEM-based Analysis of Movement and Accumulation Characteristics of Turning-type Landslide

Understandings on the movement characteristics of turning-type landslide in Shanyang county, Shaanxi Province, are obtained through discrete element analysis. The notable difference of movement velocity in the front edge of landslide lies in the differences in motion space, energy transfer, and deflection and blocking effect at each monitoring point in the leading edge of the landslide. The rock and soil mass in the middle of the landslide, as the major medium of energy transfer between the leading edge and the trailing edge, experienced multiple accelerations. The monitoring points in the trailing edge mainly experienced two stages, namely, acceleration and deceleration. Affected by the turning force, Shanyang landslide is a short-range landslide with high velocity according to the movement speed and horizontal distance, and the thickness of the accumulation body increased at first and then decreased along the motion direction.