Abstract

Induced seismicity might occur during underground energy and resource exploitation. Seismic waves usually attenuate during propagation across rock joints. Joint surface configuration parameters such as the joint roughness coefficient (JRC) and joint matching coefficient (JMC) play an important role in affecting stress wave propagation and dynamic property. An experimental study was conducted by using the modified Split Hopkinson Pressure Bar (SHPB) apparatus to reveal the influence of surface characteristics (i.e., JRC and JMC) on wave propagation quantitatively. The two bars of the SHPB apparatus were fabricated from high-strength gypsum. Each specimen has an artificial joint and consists of two parts produced by 3D printing. The effect of JRC and the combined effect of JRC and JMC on wave propagation and the dynamic mechanical property of joints were analyzed. The incident, transmitted and reflected waves were recorded from the strain gauges. Based on the basic theory of SHPB tests, the transmission coefficients, the stress–strain relationships and the specific stiffness of joints were obtained. According to the test results, both JRC and JMC affect stress wave propagation across joints and the joint specific stiffness to a significant extent. The results show that the transmission coefficient and specific stiffness decrease with increasing JRC (e.g., JMC = 1). In addition, for specimens with a given JRC, the transmission coefficient and specific stiffness decrease with the decrease of JMC.

Article highlights

• An SHPB test was conducted to investigate the wave propagation across rock masses.

• The effect of JRC on wave propagation was analyzed using the artificial specimens made from 3D printing.

• The combined effect of JRC and JMC on wave propagation was studied.

• The effect of JRC and JMC on joint specific stiffness was revealed.

中文翻译：

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接头表面特性对应力波传播影响的实验研究

摘要

在地下能源和资源开采过程中可能会引起地震活动。地震波通常在穿过节理的传播过程中衰减。关节表面构型参数（例如，关节粗糙度系数（JRC）和关节匹配系数（JMC））在影响应力波传播和动力特性方面起着重要作用。通过使用改进的分裂霍普金森压杆（SHPB）装置进行了一项实验研究，定量揭示了表面特征（即JRC和JMC）对波传播的影响。SHPB设备的两根杆是由高强度石膏制成的。每个标本都有一个人造关节，并由3D打印产生的两个部分组成。分析了JRC的影响以及JRC和JMC的联合作用对波传播和接头动态力学性能的影响。从应变仪记录入射波，透射波和反射波。基于SHPB测试的基本理论，获得了传递系数，应力-应变关系和接头的比刚度。根据测试结果，JRC和JMC都在很大程度上影响应力波在关节之间的传播以及关节的比刚度。结果表明，透射系数和比刚度随JRC的增加而降低（例如，JMC = 1）。此外，对于具有给定JRC的试样，透射系数和比刚度随JMC的降低而降低。应变计记录了透射波和反射波。基于SHPB测试的基本理论，获得了传递系数，应力-应变关系和接头的比刚度。根据测试结果，JRC和JMC都在很大程度上影响应力波在关节之间的传播以及关节的比刚度。结果表明，透射系数和比刚度随JRC的增加而降低（例如，JMC = 1）。此外，对于具有给定JRC的试样，透射系数和比刚度随JMC的降低而降低。应变计记录了透射波和反射波。基于SHPB测试的基本理论，获得了传递系数，应力-应变关系和接头的比刚度。根据测试结果，JRC和JMC都在很大程度上影响应力波在关节之间的传播以及关节的比刚度。结果表明，透射系数和比刚度随JRC的增加而降低（例如，JMC = 1）。此外，对于具有给定JRC的试样，透射系数和比刚度随JMC的降低而降低。JRC和JMC都在很大程度上影响应力波在关节之间的传播以及关节的比刚度。结果表明，透射系数和比刚度随JRC的增加而降低（例如，JMC = 1）。此外，对于具有给定JRC的试样，透射系数和比刚度随JMC的降低而降低。JRC和JMC都在很大程度上影响应力波在关节之间的传播以及关节的比刚度。结果表明，透射系数和比刚度随JRC的增加而降低（例如，JMC = 1）。此外，对于具有给定JRC的试样，透射系数和比刚度随JMC的降低而降低。

文章重点

• 进行了SHPB测试以研究波在整个岩体中的传播。

• 使用3D打印制成的人造样品分析了JRC对波传播的影响。

• 研究了JRC和JMC对波传播的综合影响。

• 揭示了JRC和JMC对关节比刚度的影响。