粒状碎屑溜砂坡运动特征与动力数值分析——溜砂坡系列研究之二

Movement characteristics and dynamical numerical analysis of sand-sliding slope composed by granular clastics Part II of sand-sliding slope series

通过现场观察和模型试验,研究了粒状碎屑溜砂坡平面上砂粒具有滑动、滚动和滑动-滚动相互转换的运动方式;砂粒运动具有牵引式和推动式的力学特征。砂粒牵引式运动平面上多为滚动,剖面上具有从上至下、从前至后带动运动的特征;砂粒推动式运动平面上多为滑动,剖面上具有从上到下、从后至前推动滑移的特征。从单个砂粒起动时的受力特征和条件,研究了砂粒滑动、滚动和碰撞的运动参数和动力学模型。

The method of dynamical numerical analysis is used to analyse the movement of grains on slope; and the research is based on in-situ Observation and model tests. First, there are two main movement patterns, slide and roll. And these two movement patterns can converse each other. The movement can be caused by pull or push forces. On the pull-surface, most of grains move in rolling pattern and the roll will be driven by the movement of sands on the top or in front of them. On the push-surface, most of grains move in slide pattern and the slide will be driven from the top or back of them. Then, based on the driven force conditions of a grain of sand, the movement parameters and dynamical model of sand in sliding, rolling and crash are derived.