Scholarlink

<p>The dissipation of strain energy is the most essential characteristic of rock mass deformation and failure. The failure of rock mass is a state instability phenomenon driven by strain energy. This paper studies the strain energy evolution and dissipation mechanism of shale containing twin fissures using true triaxial loading and unloading experiments to better understand the shale fracture damage evolution process. The results show that the strain energy evolution curve of shale under true triaxial loading and unloading conditions is divided into five stages based on the characteristic stress value defined by the strain energy method. Changes in stress state and bedding plane angle have a significant impact on the strain energy storage capacity of shale. The elastic strain energy ratio curve and the dissipated strain energy ratio curve have an inverse relationship during the shale failure process. Shale in the loading test has the lowest dissipation strain energy ratio under the same strain condition, followed by the shale in the unloading minimum principal stress (<i>σ</i><sub>3</sub>) direction, and the largest is the shale in the unloading <i>σ</i><sub>2</sub> direction. Based on the strain energy conversion effect, the final expansion direction of shale is <i>σ</i><sub>2</sub> in the loading and unloading <i>σ</i><sub>3</sub> experiments. This is the main contribution of pre-existing fissures. In the unloading <i>σ</i><sub>2</sub> experiment, shale expands significantly in both the <i>σ</i><sub>2</sub> and <i>σ</i><sub>3</sub> directions.</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

Study on Strain Energy Dissipation Mechanism of Shale Containing Twin Fissures Under True Triaxial Stresses

  • 期刊论文

  • 发表日期：

    2025年12月27日

查看全文
  • Bing-Lei Li,
  • Jin-Rui Gong,
  • Ming-Fa Huang,
  • Jia-Ning Li

摘要

The dissipation of strain energy is the most essential characteristic of rock mass deformation and failure. The failure of rock mass is a state instability phenomenon driven by strain energy. This paper studies the strain energy evolution and dissipation mechanism of shale containing twin fissures using true triaxial loading and unloading experiments to better understand the shale fracture damage evolution process. The results show that the strain energy evolution curve of shale under true triaxial loading and unloading conditions is divided into five stages based on the characteristic stress value defined by the strain energy method. Changes in stress state and bedding plane angle have a significant impact on the strain energy storage capacity of shale. The elastic strain energy ratio curve and the dissipated strain energy ratio curve have an inverse relationship during the shale failure process. Shale in the loading test has the lowest dissipation strain energy ratio under the same strain condition, followed by the shale in the unloading minimum principal stress (σ3) direction, and the largest is the shale in the unloading σ2 direction. Based on the strain energy conversion effect, the final expansion direction of shale is σ2 in the loading and unloading σ3 experiments. This is the main contribution of pre-existing fissures. In the unloading σ2 experiment, shale expands significantly in both the σ2 and σ3 directions.