Scholarlink

<p>The characteristic stresses of rock are crucial for rock stability analysis. The existing characteristic stress calculation methods are lack of methods suitable for deep rock under true triaxial conditions. Through true triaxial tests, a novel method for identifying the rock characteristic stress under true triaxial stress state by crack volumetric strain is proposed (TT-CVS method). Compared to traditional CVS methods, which are limited to uniaxial or conventional triaxial conditions and ignore the <i>σ</i><sub>2</sub> effect, the proposed TT-CVS method establishes a calculation framework, enabling accurate decoupling of strain under true triaxial states and it realizes reliable identification of characteristic stresses by accounting for regulatory role of <i>σ</i><sub>2</sub>. These innovations can reveal previously unattainable evolution laws of characteristic stresses. The evolution characteristics of rock characteristic stresses under true triaxial stress conditions are investigated. The characteristic stresses (<i>σ</i><sub>ci</sub>, <i>σ</i><sub>cd</sub>) exhibit an increasing trend with the elevation of both <i>σ</i><sub>3</sub> and <i>σ</i><sub>2</sub>. Analysis of the ratio <i>σ</i><sub>ci</sub>/<i>σ</i><sub>cd</sub> shows that an increase in <i>σ</i><sub>3</sub> prolongs the yield deformation process, whereas increase in <i>σ</i><sub>2</sub> shortens it. Various true triaxial stress combinations have different effects on characteristic stresses. The ratio <i>σ</i><sub>cd</sub>/<i>σ</i><sub>p</sub> reveals the duration of the rock’s yield deformation stage, which is within a fixed range for rocks of the same lithology falls. The research findings provide important guidance for understanding brittle disasters mechanisms of deep hard rock.</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

Evolution of Characteristic Stresses in Deep Hard Rocks Under True Triaxial Stresses: The TT-CVS Identification Approach

  • 期刊论文

  • 发表日期：

    2026年2月20日

查看全文
  • Yan Zhang,
  • Kai Meng,
  • Zhilong Zhang,
  • Shaojun Li,
  • Tianbin Li,
  • Yangyi Zhou,
  • Chunchi Ma,
  • Yaohui Gao

摘要

The characteristic stresses of rock are crucial for rock stability analysis. The existing characteristic stress calculation methods are lack of methods suitable for deep rock under true triaxial conditions. Through true triaxial tests, a novel method for identifying the rock characteristic stress under true triaxial stress state by crack volumetric strain is proposed (TT-CVS method). Compared to traditional CVS methods, which are limited to uniaxial or conventional triaxial conditions and ignore the σ2 effect, the proposed TT-CVS method establishes a calculation framework, enabling accurate decoupling of strain under true triaxial states and it realizes reliable identification of characteristic stresses by accounting for regulatory role of σ2. These innovations can reveal previously unattainable evolution laws of characteristic stresses. The evolution characteristics of rock characteristic stresses under true triaxial stress conditions are investigated. The characteristic stresses (σci, σcd) exhibit an increasing trend with the elevation of both σ3 and σ2. Analysis of the ratio σci/σcd shows that an increase in σ3 prolongs the yield deformation process, whereas increase in σ2 shortens it. Various true triaxial stress combinations have different effects on characteristic stresses. The ratio σcd/σp reveals the duration of the rock’s yield deformation stage, which is within a fixed range for rocks of the same lithology falls. The research findings provide important guidance for understanding brittle disasters mechanisms of deep hard rock.