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<p>Stress wave propagation is a fundamental topic in rock dynamics, primarily governed by the spatial heterogeneity of geomaterials’ internal mesostructure. However, the complex propagation behaviour and influencing mechanisms of stress waves in heterogeneous media remain insufficiently understood. This study, based on stress wave propagation theory, investigates Xiyu conglomerate as a representative heterogeneous material. A meso-scale model is developed using Fourier analysis to characterize material heterogeneity. Viscous boundary conditions are incorporated through a mesoscopic contact bond model. The discrete element method (DEM) is employed to analyse the propagation characteristics of stress waves in heterogeneous media. The results reveal that stress wave propagation is strongly affected by multiple mesoscopic characteristics. Specifically, increasing gravel content results in a quadratic rise in wave velocity. For every 10% increase in the mud–cement ratio, P-wave velocity decreases by approximately 6.9%, and <i>S</i>-wave velocity decreases by about 7.9%. Similarly, a 1% increase in sample porosity results in a 2.5% reduction in <i>P</i>-wave velocity and an 8.1% decrease in <i>S</i>-wave velocity. In addition, the effective dynamic elastic modulus increases with wave velocity, reaching two to four times the static modulus under similar conditions. These findings offer valuable insights for dynamic response analysis in geotechnical engineering and aid in predicting the dynamic and static parameters of Xiyu conglomerate.</p>

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Study on Mesoscopic Stress Wave Propagation in Heterogeneous Xiyu Conglomerate

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Zhe Sun,
  • Chong Shi,
  • Su Wu,
  • Yelin Feng,
  • Fudong Chi

摘要

Stress wave propagation is a fundamental topic in rock dynamics, primarily governed by the spatial heterogeneity of geomaterials’ internal mesostructure. However, the complex propagation behaviour and influencing mechanisms of stress waves in heterogeneous media remain insufficiently understood. This study, based on stress wave propagation theory, investigates Xiyu conglomerate as a representative heterogeneous material. A meso-scale model is developed using Fourier analysis to characterize material heterogeneity. Viscous boundary conditions are incorporated through a mesoscopic contact bond model. The discrete element method (DEM) is employed to analyse the propagation characteristics of stress waves in heterogeneous media. The results reveal that stress wave propagation is strongly affected by multiple mesoscopic characteristics. Specifically, increasing gravel content results in a quadratic rise in wave velocity. For every 10% increase in the mud–cement ratio, P-wave velocity decreases by approximately 6.9%, and S-wave velocity decreases by about 7.9%. Similarly, a 1% increase in sample porosity results in a 2.5% reduction in P-wave velocity and an 8.1% decrease in S-wave velocity. In addition, the effective dynamic elastic modulus increases with wave velocity, reaching two to four times the static modulus under similar conditions. These findings offer valuable insights for dynamic response analysis in geotechnical engineering and aid in predicting the dynamic and static parameters of Xiyu conglomerate.