【摘要】 用切线刚度和法线刚度描述结构面特性,研究结构面初始刚度、频率、法向闭合量与其最大允许闭合量的比值对透射系数的影响。采用基于连续介质的块体离散元程序(CDEM)模拟结构面发生非线性变形条件下块体响应,研究结果表明,应力波在岩体中传播是一个传播和块体响应的过程,结构面的存在影响了应力波传播和响应,存在一个特征频率能够有效反映结构面刚度变化,给出了近似计算该特征频率的表达式,对岩体结构探测具有一定的指导意义。更多还原

【Abstract】 Property of structural surface is described by tangent stiffness and secant stiffness.The effect of initial rigidities of structural surface,frequency of stress wave and the ratio of normal and maximum allowed fracture closure of structural surface on transmission coefficient is studied.Block response of structural surface under nonlinear deformation is simulated by continuous-based discrete element method(CDEM).The results show that the stress wave propagation in rock mass is a process of both wave propagation and block response;the propagation of stress wave and response of stress wave are influenced by structural surface;stiffness variation of structural surface is effectively reflected by characteristic frequency.The computational expressions of characteristic frequency are given.The findings in this paper can be useful to the detection of rock mass structural surface.更多还原