【摘要】 在土壤切削数值模拟研究中，常见的有限元法会因网格扭曲变形严重而减慢甚至终止，而离散元法存在土壤参数标定复杂等问题。针对以上问题，为提高土壤切削数值模拟精度，采用数值计算方法——物质点法，基于土壤的理想弹塑性本构关系以及莫尔-库伦失效准则和最大主应力失效准则建立了土壤切削模型。将数值模拟结果同已发表的试验数据对比，发现在土壤不同区域的变形预测及其动态演化过程中，本文数值模拟结果同试验结果高度吻合：剪切角误差不超过2.5°、剪切长度平均误差为10.4mm；在土壤发生剪切失效时，对土壤切削阻力预测精度较高，平均误差为3.4%。验证了物质点法在土壤切削过程模拟的可行性与有效性，为土壤切削过程的数值模拟提供了新思路。更多还原

【Abstract】 In the numerical simulation research of soil cutting, the commonly used finite element method(FEM) may slow down or even terminate due to severe mesh distortion, while the discrete element method(DEM) has complex soil parameter calibration problems. Aiming at the above issues, in order to improve the accuracy of soil cutting numerical simulation, a soil cutting model was established with a numerical calculation method-the material point method(MPM), based on the ideal elastic-plastic constitutive relationship of the soil, as well as the Mohr Coulomb failure criterion and maximum principal stress failure criterion. The numerical simulation results are compared with published experimental data. The results show that in the deformation prediction and dynamic evolution process of different soil regions, the numerical simulation results in this paper are highly consistent with the experimental results: the shear angle error does not exceed 2.5°, and the average shear length error is 10.4mm; When soil shear failure occurs, the prediction accuracy of soil cutting resistance is relatively high, with an average error of 3.4%. The feasibility and effectiveness of the material point method in soil cutting process simulation are verified, which provides a new idea for the numerical simulation of soil cutting process.更多还原