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针对离散元中圆形颗粒模拟出的内摩擦角小于真实砂土内摩擦角的缺陷,将已有NS2D离散元程序中的圆形颗粒参量改进为椭圆形颗粒参量,形成改进的NS2D程序。介绍了改进后NS2D程序的基本力学模型,详细推导了程序中椭圆颗粒间以及椭圆颗粒与墙之间接触点的力-位移关系。利用改进后的离散元程序分别模拟了恒定围压下长短轴比例分别为1.1:1、1.4:1,孔隙比均为0.19的椭圆颗粒堆积体的双轴试验,所得的内摩擦角在真实砂土的内摩擦角范围之内,且其应力特征与已有成果吻合良好,证明了改进后的NS2D离散元程序能够模拟分析真实砂土的力学性能。
In view of the defect that the internal friction angle of the discrete element is smaller than the internal friction angle of the real sand, the parameters of the circular particle in the existing NS2D discrete element program are improved to the elliptical particle parameter to form an improved NS2D program. The basic mechanics model of the improved NS2D program is introduced, and the force-displacement relationship between the elliptical particles and the contact points between the elliptical particles and the wall is deduced in detail. The improved discrete element program was used to simulate the biaxial tests of the ellipsoidal particle stack with the ratio of the major axis to the minor axis of 1.1: 1, 1.4: 1 and the void ratio of 0.19 under the constant confining pressure respectively. Soil within the scope of the internal friction angle, and its stress characteristics and the existing results in good agreement that the improved NS2D discrete element program to simulate the analysis of real mechanical properties of sand.