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为了研究围压对双轴试验力学参数的影响,利用离散元方法(二维)数值模拟了不同围压下试件的响应结果,研究了围压对弹性模量、泊松比和强度的影响,给出了0 MPa和25 MPa围压下试件的破坏模式和颗粒间的接触力、位移矢量、裂缝分布。结果表明:围压与弹性模量、强度呈直线增长关系,泊松比随着围压的增大而减小,两者呈二次多项式关系,25 MPa比0 MPa时试件的最大接触力增大28.15%、最大位移增加0.03 mm、裂缝数增加92条。
In order to study the influence of confining pressure on the mechanical parameters of biaxial test, the response of specimens under different confining pressure was simulated by discrete element method (two-dimensional) numerical simulation. The effect of confining pressure on elastic modulus, Poisson’s ratio and strength The fracture modes and the contact forces between particles, the displacement vector and the fracture distribution are given under confining pressure of 0 MPa and 25 MPa. The results show that the relationship between confining pressure and elastic modulus and strength increases linearly. The Poisson’s ratio decreases with the increase of confining pressure. The relationship between them is quadratic polynomial. The maximum contact force of specimen at 25 MPa is higher than 0 MPa Increased 28.15%, the maximum displacement increased 0.03 mm, the number of cracks increased 92.