粘土滑体运动特性及变形解体数值模拟

Clay Sliding Body:Characteristics and Its Finite Element Simulation of both Deformation and Disintegration

为分析粘土滑体下滑中的运动特性及变形解体规律,编写PFC3D颗粒流程序,建立滑体沿滑面、坡面及水平面运动的数值模型,模拟滑体失稳后运动的全过程。将滑体试样划分为前段、中段、后段3个部分,通过对3段滑体中部和侧部上下层位置滑体颗粒的速度、运动中滑体的微裂隙发展情况及滑体运动中各能量的变化情况进行追踪,观测分析滑体的运动状态及变形解体随时间的演化过程,结果表明:滑体的运动速度与滑体的位置有关,主要是因为在运动过程中滑体会受到其他滑体的影响;滑体的变形解体在运动中会一直发生,通常在滑体的运动状态发生剧烈改变时解体程度最大。

In order to make analysis about the landslide body movement characterisitcs and its disintegration rule,the PFC3D particles flow program was built,so as to establish the numerical model of slip sliding surface,slope and the horizontal movement.The simulation can reflect the whole process when the landslide is unstable.The sliding body samples can be divided into three parts,namely the forward part,the middle part and the back part.In the middle part and the lower position of lateral of the sliding body,by tracking the velocity on the particle,the development of the movement of the sliding body microfracture situation and the change of energy,the state of the movement and the evolution process of the disintegration can be analyzed.Results show that the movement speed is related to the position of sliding body,which is mainly because that during the process of sliding,the sliding body can be influenced by other sliding body.The deformation and disintegration of sliding body will happen all the time during the movement,and the degree of disintegration reaches the maximum when the motion state of sliding body changes rapidly.