【摘要】 通过分析毛管水形成液桥对土壤微观力学结构的影响,引入并行约束来表征土壤颗粒间液桥的黏性作用,建立了土壤颗粒接触非线性力学模型,并对波纹形复杂表面推土板前端土壤的动态扰动行为进行了离散元宏细观模拟。结果表明,离散元模拟不仅准确再现了实验分析中复杂表面结构对土壤动态扰动行为影响的研究结果,而且从土壤颗粒运动以及土块破碎等细观角度准确分析了触土部件复杂表面对土壤动态扰动行为的影响因素和机理。更多还原

【Abstract】 Based 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.更多还原