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<p>Consolidated-drained triaxial tests were conducted on soil-rock mixtures (SRMs) from Huangzhou, China. Based on three-dimensional particle flow code theory, a numerical model simulating graded SRMs under triaxial conditions was developed using PFC3D (<i>Particle Flow Code</i> in Three Dimensions) at the mesoscopic scale. The stress–strain and volumetric strain–axial strain relationships obtained from the particle flow simulations were compared with laboratory test results under varying confining pressures. The results indicate that as confining pressure increases, the stress–strain behavior transitions from strain-hardening to strain-softening, accompanied by shear dilatancy. However, the degree of shear dilatancy decreases with increasing confining pressure. The stress–strain curves derived from numerical simulations using calibrated micro-parameters exhibit good agreement with experimental data. This study demonstrates that the particle flow method can effectively simulate the mechanical behavior of SRMs under triaxial loading conditions.</p>

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Discrete Element Analysis of Typical Soil-Rock Mixtures Under Large Triaxial Tests

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Hai Tian,
  • Jun Li

摘要

Consolidated-drained triaxial tests were conducted on soil-rock mixtures (SRMs) from Huangzhou, China. Based on three-dimensional particle flow code theory, a numerical model simulating graded SRMs under triaxial conditions was developed using PFC3D (Particle Flow Code in Three Dimensions) at the mesoscopic scale. The stress–strain and volumetric strain–axial strain relationships obtained from the particle flow simulations were compared with laboratory test results under varying confining pressures. The results indicate that as confining pressure increases, the stress–strain behavior transitions from strain-hardening to strain-softening, accompanied by shear dilatancy. However, the degree of shear dilatancy decreases with increasing confining pressure. The stress–strain curves derived from numerical simulations using calibrated micro-parameters exhibit good agreement with experimental data. This study demonstrates that the particle flow method can effectively simulate the mechanical behavior of SRMs under triaxial loading conditions.