Scholarlink

<p>The stability of engineering rock mass is significantly affected by the combined effects of hydraulic and mechanical processes. This study aims to investigate the hydro-mechanical behaviors and multiscale failure mechanisms of silty mudstone under seepage-stress coupling conditions. Shear-seepage tests were performed on silty mudstone considering various seepage pressures and normal stresses. Seepage-induced damage mechanisms were analyzed by nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM). The results demonstrate that higher seepage pressure reduces the shear strength, residual shear strength, shear modulus, and cohesion of silty mudstone while increasing the internal friction angle. Flow in the rock evolves through slow growth, surge, and stabilization, with fluctuations during the stabilization stage decreasing as normal stress increases. A shear-seepage coupling model was also developed in PFC3D with Python to explore mesoscopic damage. The simulations indicate that seepage pressure promotes the reorientation and intensification of fabric anisotropy and the development of associated crack zone, leading to mixed shear-tensile failure of the models. Friction primarily accounts for energy dissipation due to particle sliding and rotation driven by seepage pressures, while kinetic energy constitutes less than 2% of the total. The combined effects of clay-mineral hydration-swelling and absorption-wedging drive multiscale degradation in silty mudstone under seepage. These processes create microcracks, weaken interparticle contacts, and destabilize the mesoscale load-bearing network, causing marked drops in shear strength. These findings could provide insights for predicting rock mass instability and analyzing the causes underlying catastrophic ruptures.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Experimental and numerical investigation on the shear mechanical behaviors and failure mechanisms of silty mudstone under seepage-stress coupling

  • 期刊论文

  • 发表日期：

    2026年7月10日

查看全文
  • Xiaowei Yu,
  • Jiade Zhang,
  • Hongyuan Fu,
  • Ling Zeng,
  • Hongri Zhang,
  • Jingcheng Chen,
  • Jie Liu

摘要

The stability of engineering rock mass is significantly affected by the combined effects of hydraulic and mechanical processes. This study aims to investigate the hydro-mechanical behaviors and multiscale failure mechanisms of silty mudstone under seepage-stress coupling conditions. Shear-seepage tests were performed on silty mudstone considering various seepage pressures and normal stresses. Seepage-induced damage mechanisms were analyzed by nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM). The results demonstrate that higher seepage pressure reduces the shear strength, residual shear strength, shear modulus, and cohesion of silty mudstone while increasing the internal friction angle. Flow in the rock evolves through slow growth, surge, and stabilization, with fluctuations during the stabilization stage decreasing as normal stress increases. A shear-seepage coupling model was also developed in PFC3D with Python to explore mesoscopic damage. The simulations indicate that seepage pressure promotes the reorientation and intensification of fabric anisotropy and the development of associated crack zone, leading to mixed shear-tensile failure of the models. Friction primarily accounts for energy dissipation due to particle sliding and rotation driven by seepage pressures, while kinetic energy constitutes less than 2% of the total. The combined effects of clay-mineral hydration-swelling and absorption-wedging drive multiscale degradation in silty mudstone under seepage. These processes create microcracks, weaken interparticle contacts, and destabilize the mesoscale load-bearing network, causing marked drops in shear strength. These findings could provide insights for predicting rock mass instability and analyzing the causes underlying catastrophic ruptures.