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基于离散元法,用不同尺寸的球体代表土壤颗粒,添加平行粘连模型模拟颗粒间的相互作用,对沙土直剪试验进行数值研究;为了校正和验证数值模型和输入参数,将剪切结果与标准直剪试验所得的抗剪强度进行对比,结论表明离散元数值模型的仿真结果和试验能够很好吻合;还详细讨论了剪切过程中土壤颗粒的运动情况,以及剪切盒形状、剪切速度、法向载荷对剪切曲线和颗粒料床孔隙率的影响。
Based on the discrete element method, the spherical particles of different sizes are used to represent the soil particles, the parallel adhesion model is added to simulate the interaction between the particles and the numerical study of the direct shear test of sand is conducted. In order to calibrate and validate the numerical model and input parameters, The results show that the simulation results of the discrete element numerical model are in good agreement with the experiments. The movement of soil particles during shearing is also discussed in detail, as well as the shape of shear box, the shear rate Effect of normal load on shear curve and porosity of granular bed.