推土板切土角对干土壤动态行为影响的离散元模拟

Simulation on dynamic behavior of dry soil ahead of the bulldozing plate with different cutting angles by DEM

根据液桥对土壤微观力学结构的影响,在传统离散单元法理论的基础上,建立了土壤颗粒接触非线性力学模型,并对不同切土角推土板前端干土壤的动态行为进行了离散元模拟。准确再现了实验室实验中切土角对板面前端干土壤动态行为影响的定性和定量结果,并通过离散元细观分析从土壤内部土壤颗粒运动合理解释了干土壤宏观形态的变化规律和影响因素。

The nonlinear mechanical model of contact between soil particles was established based on the effects of liquid bridges on mechanical microstructure of soil and the basic Distinct Element Method （DEM） theory. The dynamic behaviors of dry soil ahead of the bulldozing plate with different cutting angles were simulated by DEM. The DEM simulations reappear the qualitative and the quantitative results by laboratory test accurately. Moreover, the mesocopic analyses by DEM explain the variational laws and the influence factors of dynamic macroscopic configurations of dry soil through soil particles motion in soil body.