【摘要】 为了提高风积砂的抗剪强度，采用橡胶颗粒对其进行改善，在室内进行了橡胶砂复合土的直剪试验，利用颗粒流软件分析了摩擦系数、孔隙率、接触刚度、剪切速率等细观参数对橡胶砂复合土宏观力学性能的影响。从细观力学角度，从力链、孔隙率、平均配位数变化、速度场和位移场等方面分析了直剪试验中橡胶砂的细观力学性能和颗粒变形规律。结果表明，数值模拟结果与室内试验结果基本一致，摩擦系数、孔隙率、接触刚度等微观参数对初始弹性模量、峰值压力和峰值强度影响较大，而剪切速率对试验结果影响不大。更多还原

【Abstract】 In order to improve the shear strength of aeolian sand,rubber particles were used to improve it. The direct shear test of rubber-sand composite soil was carried out in the laboratory. The effects of meso-parameters such as friction coefficient,porosity, contact stiffness, and shear rate on the macroscopic mechanical properties of rubber-sand composite soil were analyzed by using the particle flow software. From the perspective of micro-mechanics,the microscopic mechanical properties and particle deformation laws of rubber sand in the direct shear test were analyzed from the aspects of force chain, porosity, variation of average coordination number, velocity field, and displacement field. The results showed that the numerical simulation results were basically consistent with the laboratory test results. The microscopic parameters such as the friction coefficient,the porosity,and the contact stiffness had great effects on the initial elastic modulus, the peak pressure, and the peak strength, while the shear rate had little effect on the test results.更多还原