中文摘要：

针对铲式成穴器对土壤的动态破坏过程，提出采用离散元法研究成穴器的成穴性能．建立了成穴器与土壤的二维离散元仿真分析模型，通过施加合理的力学模型进行成穴器工作过程的离散元仿真分析．由仿真结果可知：随着工作速度的加快，土壤的扰动明显加剧，回流覆盖效果变差；随着土壤含水率的增加，土壤的团聚现象明显，土壤流动性变差．将仿真计算结果与理论分析结果对比．两者的变化趋替基本一致．由此初步说明了采用离散元法分析铲式成穴器成穴性能的可行性．

英文摘要：

The cavitation performance of spade soil opener was investigated by discrete element method （DEM） to discuss the soil dynamic breaking process of spade soil opener. The twodimensional DEM analy zing models of soil opener and soil granules were built respectively. The working process of the soil opener was simulated based on the proposed twodimensional DEM analyzing models through a reasonable mechanical model. The simulation results show that with the increasing of working speed, the disturbance of soil increases obviously with worse backflow covering effect of soil. With the increase of soil moisture content, the soil reu nion phenomenon becomes obvious with decreased soil liquidity. The simulation results are consistent with those of theoretical analysis. It is feasible to analyze the performance of spade soil opener by the proposed DEM.