滑坡运动二维黏壶分析模型

Two-Dimensional Dashpot Model of Landslide-Debris Avalanches

许多滑体在运动过程中,自身发生较大的变形,甚至发展成碎屑流,而传统的条分法没有考虑滑体运动过程中滑体的自身变形、相互碰撞等产生的内部耗能,和实际情况有所差别。因此,在分析滑坡过程中能量转化规律的基础上,考虑平面问题,综合条分法的特点,将滑体分成若干个滑块,并用黏壶相连接。采用黏壶变形耗能代替滑坡过程中滑体的内部耗能。然后建立各滑块的运动方程。通过编程计算,可得到滑体最终的冲程、最大速度和运动时间等滑坡评估指标。最后基于室内模型试验结果,分别运用离散元方法和提出的滑坡分析模型进行对比分析,证明该分析模型的正确性。

In the process of landslide movement,the sliding body will occur large deformation,even develop into debrisflow.In the conventional slice method,the internal energy dissipationoccurred by the deformation and inter-collision is not take into account,and is different from the actual situation.Therefore,on the basis of analyzing the law of energy conversion in the process of landslide,and the characteristics of slice method,the whole sliding body is divided into severalsliding block,and in connection with dashpot.The internal energy consumption of sliding mass in the process of landslide is replaced by dashpot deformation energy consumption.Then,establish the motion equation of each slider.and can get the final landslide evaluation indexes such as run-out,maximum speed and movement timethrough the programming calculation.Finally,based on the model test results,compare the results respectively using the discrete element method and the proposed landslide analysis model,the correctness of the proposed analytical model can be proved.