Abstract Complex rock mass (wave impedances on two sides of the joint are different) commonly exists, which results in the propagation direction induced difference of transmission coefficient (PDIDTC). The PDIDTC is defined as the difference ratio of two transmission coefficients of waves in two opposite directions. The present paper further studied the displacement discontinuous method to investigate the PDIDTCs of particle velocity and stress in the complex rock mass. A modified SHPB test was conducted to validate the theoretical results. The effects of incident wave frequency and joint stiffness on the PDIDTC were discussed. Two cases of PDIDTC of blast wave, rectangular pulse and triangular pulse were illustrated. The results show that the PDIDTCs of particle velocity and stress are not influenced by the frequency, joint stiffness and waveform, but are influenced by the wave impedance ratio significantly. Moreover, obvious PDIDTC can be obtained when the wave propagates through complex rock mass, which cannot be ignored during rock dynamic analysis.

中文翻译：

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复杂岩体中传播方向引起的传输系数差异研究

摘要 复杂岩体（节理两侧波阻抗不同）普遍存在，导致传播方向引起的传输系数差异（PDIDTC）。PDIDTC 定义为两个相反方向的波的两个传输系数的差比。本文进一步研究了位移间断法研究复杂岩体中质点速度和应力的PDIDTCs。进行了改进的 SHPB 测试以验证理论结果。讨论了入射波频率和关节刚度对 PDIDTC 的影响。举例说明了冲击波、矩形脉冲和三角脉冲的PDIDTC两种情况。结果表明，粒子速度和应力的 PDIDTCs 不受频率、关节刚度和波形的影响，但受波阻抗比的影响很大。此外，当波在复杂岩体中传播时，可以获得明显的PDIDTC，这在岩石动力分析中是不可忽视的。