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基于黏弹性理论,提出平行节理岩体的一维动态等效连续介质模型,该模型适用于纵波(P波)垂直通过一组等间距平行节理岩体的动力学问题。该模型包含黏弹性介质模型和虚拟波源概念。黏弹性介质模型主要描述应力波通过节理的衰减和时间的滞后;而虚拟波源的概念则描述应力波在平行节理之间的多次反射。根据已有解析解可以确定黏弹性介质模型中的未知参数。通过和位移不连续方法的比较,验证平行节理岩体的一维动态等效连续介质模型的正确性;该模型可有效地应用于研究通过一组平行节理岩体的P波传播问题。结果表明,该研究可以简化应力波传播问题的复杂性。
Based on the theory of viscoelasticity, a one-dimensional dynamic equivalent continuum model of parallel jointed rock mass is proposed, which is suitable for the dynamic problem of longitudinal wave (P wave) passing vertically through a set of equally spaced parallel jointed rock masses. The model includes the viscoelastic medium model and the concept of virtual wave source. The viscoelastic medium model mainly describes the attenuation of stress waves and the lag of time through the joints. The concept of virtual wave source describes the multiple reflections of stress waves between parallel joints. According to the existing analytical solutions, the unknown parameters in the viscoelastic medium model can be determined. The correctness of one-dimensional dynamic equivalent continuum model for parallel jointed rock mass is verified by comparison with displacement discontinuous method. This model can be effectively applied to the study of P-wave propagation through a group of parallel jointed rock masses. The results show that this study can simplify the complexity of stress wave propagation.