关键词: 农业工程, 土壤动态扰动行为, 离散单元法, 非线性力学模型, 宏细观模拟, 波纹形表面

Abstract:

ased on the effects of liquid bridges formed by the capillary water on the micromechanical structure of soil, a nonlinear mechanical model of contact between soil particles was established by introducing parallel bonds which can represent the cohesive actions of liquid bridges between soil particles. The dynamic disturbed behavior of soil, which was subject to the bulldozing plate with a complex wavy surface, were simulated by discrete element method (DEM) from the macroscopic and the mesoscopic aspects. The DEM simulations reappear the qualitative and the quantitative results by laboratory test accurately. Moreover, from the mesocopic analyses by DEM, including the soil particle motion and the soil clump fracture, the influencing factors and the mechanism on the dynamic behavior resulted from the complex surface of the soiltouching part were given accurately.

Key words: agricultural engineering, dynamic disturbed behavior of soil, distinct element method (DEM), nonlinear mechanical model, macroscopic and mesoscopic simulation, wavy surface