论文部分内容阅读
针对三维离散元程序中刚度参数合理选取方法及其应用开展研究.通过理论分析,给出了结构面剪切刚度及法向刚度的理论公式;结合室内剪切试验研究和数值分析,得到了符合工程实际的剪切刚度修正Bandis经验公式及法向刚度参数经验公式,从而明确提出了一种结构面刚度参数的选取方法;通过实际工程边坡稳定性分析,探究了基于上述方法选取的参数对实际工程模拟的适用性.研究表明,岩体结构面刚度参数是应力的函数,修正Bandis经验公式能够较为完善地表征剪切破坏前结构面的剪切刚度变化规律;利用编制FISH程序使刚度参数随应力变化而改变的方法,使3DEC软件对工程岩体变形特征的模拟更加符合实际,从而验证了该方法的合理性.
Aiming at the reasonable selection method of stiffness parameters and its application in 3D discrete element program, the theoretical formulas of shear stiffness and normal stiffness of structural plane are given through theoretical analysis. Combining with the research of indoor shear test and numerical analysis, The actual shear stiffness is corrected by Bandis empirical formula and empirical formula of normal stiffness parameters, so a method for selecting stiffness parameters of structural plane is proposed clearly. Through the analysis of actual engineering slope stability, the parameter pair selected based on the above method is explored The results show that the stiffness parameter of rock mass is a function of stress, and the modified Bandis empirical formula can better characterize the variation of shear stiffness of the structural plane before shear failure. By using FISH program, the stiffness parameter With the change of stress, 3DEC software simulates the deformation characteristics of engineering rock mass more exactly, which verifies the rationality of this method.