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<p>To investigate the dynamic shear behavior and micromechanical mechanisms of soil–rock mixture (SRM)–concrete interfaces under cyclic normal loading, large-scale cyclic direct shear tests and discrete element simulations were conducted. The experimental program involved three initial normal stresses (100, 200, and 300&#xa0;kPa) and three interface roughness coefficients (0.4, 9.5, and 16.7). The results showed pronounced cyclic hardening and hysteretic energy dissipation, with the shear response gradually stabilizing over cycles. Increased normal stress significantly enhanced shear stiffness, reduced damping ratio, and suppressed particle rearrangement and sliding. Higher interface roughness improved shear strength under low normal stresses. Particle displacement was concentrated within the shear band, where the coordination number was markedly lower than in surrounding zones. Compared to 100&#xa0;kPa, the average coordination number decreased by 5.46% and 25.56% under 200 and 300&#xa0;kPa, respectively. Elevated normal stress stabilized the force chain network and enhanced the load-bearing capacity of the interface. Under cyclic loading, the force chain structure gradually became more stable.</p>

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Bidirectional Cyclic Shear Test and Discrete Element Analysis of Soil-Rock Mixture–Structure Interface under Dynamic Normal Loading

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Jin-Xiao Li,
  • Chen-Bo Gao,
  • Fei-Yu Liu

摘要

To investigate the dynamic shear behavior and micromechanical mechanisms of soil–rock mixture (SRM)–concrete interfaces under cyclic normal loading, large-scale cyclic direct shear tests and discrete element simulations were conducted. The experimental program involved three initial normal stresses (100, 200, and 300 kPa) and three interface roughness coefficients (0.4, 9.5, and 16.7). The results showed pronounced cyclic hardening and hysteretic energy dissipation, with the shear response gradually stabilizing over cycles. Increased normal stress significantly enhanced shear stiffness, reduced damping ratio, and suppressed particle rearrangement and sliding. Higher interface roughness improved shear strength under low normal stresses. Particle displacement was concentrated within the shear band, where the coordination number was markedly lower than in surrounding zones. Compared to 100 kPa, the average coordination number decreased by 5.46% and 25.56% under 200 and 300 kPa, respectively. Elevated normal stress stabilized the force chain network and enhanced the load-bearing capacity of the interface. Under cyclic loading, the force chain structure gradually became more stable.