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<p>The interface between rock and shotcrete is a critical vulnerability in composite structures, such as tunnel linings, which often experience failure under dynamic stress. This study examines the impact of material property variations between rock and shotcrete on the dynamic tensile performance and failure mechanisms at their interface, utilizing dynamic splitting tensile tests conducted with a separate Hopkinson pressure bar (SHPB). The results show that the nominal cracking tensile strength (NCTS) and nominal tensile strength (NTS) are mainly influenced by the discrepancy in elastic modulus between rock and shotcrete. A smaller modulus difference enhances cooperative deformation, reducing the stress concentration and delaying crack initiation. Additionally, rocks with a higher elastic modulus are observed to slow the interface crack propagation. The tensile strength of the shotcrete further plays a significant role in determining interfacial bond strength, increasing both crack initiation and propagation energies. A tensile damage model that effectively incorporates strain rate effects predicts the evolution of interface tensile behavior, providing valuable insights for improving rock-shotcrete interface design in various engineering applications. This research ultimately contributes to enhancing the durability and stability of tunnel structures under dynamic loading conditions.</p>

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Dynamic Tensile Characteristics Analysis and Tensile Constitutive Model of the Rock-Shotcrete Interface Under Different Rock Layers

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Jianxing Chen,
  • Lei Zhou,
  • Xiucheng Zhang,
  • Xinggui Zeng,
  • Jianhui Lin

摘要

The interface between rock and shotcrete is a critical vulnerability in composite structures, such as tunnel linings, which often experience failure under dynamic stress. This study examines the impact of material property variations between rock and shotcrete on the dynamic tensile performance and failure mechanisms at their interface, utilizing dynamic splitting tensile tests conducted with a separate Hopkinson pressure bar (SHPB). The results show that the nominal cracking tensile strength (NCTS) and nominal tensile strength (NTS) are mainly influenced by the discrepancy in elastic modulus between rock and shotcrete. A smaller modulus difference enhances cooperative deformation, reducing the stress concentration and delaying crack initiation. Additionally, rocks with a higher elastic modulus are observed to slow the interface crack propagation. The tensile strength of the shotcrete further plays a significant role in determining interfacial bond strength, increasing both crack initiation and propagation energies. A tensile damage model that effectively incorporates strain rate effects predicts the evolution of interface tensile behavior, providing valuable insights for improving rock-shotcrete interface design in various engineering applications. This research ultimately contributes to enhancing the durability and stability of tunnel structures under dynamic loading conditions.