The fissures are ubiquitous in deep rock masses, and they are prone to instability and failure under dynamic loads. In order to study the propagation attenuation of dynamic stress waves in rock mass with different number of fractures under confining pressure, nonlinear theoretical analysis, indoor model test and numerical simulation are used respectively. The theoretical derivation is based on displacement discontinuity method and nonlinear fissure mechanics model named BB model. Using ABAQUS software to establish a numerical model to verify theoretical accuracy, and indoor model tests were carried out too. The research shows that the stress attenuation coefficient decreases with the increase of the number of fissures. The numerical simulation results and experimental results are basically consistent with the theoretical values, which verifies the rationality of the propagation equation.

中文翻译：

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基于非线性分析的应力波在不同裂隙岩体中的传播

裂隙在深部岩体中无处不在，并且在动态载荷下容易发生不稳定和破坏。为了研究围压下不同裂隙数的岩体中动态应力波的传播衰减，分别进行了非线性理论分析，室内模型试验和数值模拟。理论推导基于位移不连续性方法和称为BB模型的非线性裂缝力学模型。使用ABAQUS软件建立数值模型以验证理论准确性，并且还进行了室内模型测试。研究表明，应力衰减系数随着裂缝数量的增加而减小。数值模拟结果和实验结果与理论值基本一致，