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<p>Under complex hydrogeological conditions, the shear creep characteristics of jointed rock masses play an important role in the long-term stability of slopes. Joint angle and submergence are key factors affecting the shear creep behavior of jointed rock masses. To investigate the time-dependent deformation behavior of jointed sandstone with different joint angles, prefabricated jointed sandstone samples are prepared. Shear creep tests are then conducted at joint angles of 25–45° under natural and submerged conditions using a self-developed creep-impact testing machine and a variable-angle shear box. The results demonstrate that creep deformation and strain rate increase with increasing joint angle and vertical load under both moisture states. Compared with the natural samples, the submerged samples exhibit considerably higher creep deformation and strain rates. Furthermore, prolonged immersion results in a more abrupt failure behavior. The submerged environment has a notably greater effect on the shear deformation of jointed sandstone compared with the joint angle and vertical load; however, the joint angle remains a key factor in controlling the creep failure of the sandstone. Finally, a multifactor shear creep constitutive model that combines a shear stress ratio (capturing joint angle, joint roughness, and load) with an exponential time law and damage mechanics is proposed. The proposed model describes the entire creep phase of jointed sandstone accurately and provides theoretical support for the stability assessment of water-influenced slope engineering projects.</p>

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Shear Creep Testing and Constitutive Modeling of Jointed Sandstone with Varying Joint Angles Under Submerged Conditions

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Honglei Liu,
  • Jianhua Zhou,
  • Xige Liu,
  • Jinduo Li,
  • Tianhong Yang,
  • Chen Yang,
  • Wenxue Deng

摘要

Under complex hydrogeological conditions, the shear creep characteristics of jointed rock masses play an important role in the long-term stability of slopes. Joint angle and submergence are key factors affecting the shear creep behavior of jointed rock masses. To investigate the time-dependent deformation behavior of jointed sandstone with different joint angles, prefabricated jointed sandstone samples are prepared. Shear creep tests are then conducted at joint angles of 25–45° under natural and submerged conditions using a self-developed creep-impact testing machine and a variable-angle shear box. The results demonstrate that creep deformation and strain rate increase with increasing joint angle and vertical load under both moisture states. Compared with the natural samples, the submerged samples exhibit considerably higher creep deformation and strain rates. Furthermore, prolonged immersion results in a more abrupt failure behavior. The submerged environment has a notably greater effect on the shear deformation of jointed sandstone compared with the joint angle and vertical load; however, the joint angle remains a key factor in controlling the creep failure of the sandstone. Finally, a multifactor shear creep constitutive model that combines a shear stress ratio (capturing joint angle, joint roughness, and load) with an exponential time law and damage mechanics is proposed. The proposed model describes the entire creep phase of jointed sandstone accurately and provides theoretical support for the stability assessment of water-influenced slope engineering projects.