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<p>This study presents a comprehensive classification of rock masses undergoing dilation under varying confining pressures, joint configurations, and gouge conditions using data universe of laboratory and insitu tesing. A pressure and damage-sensitive plastic parameter has been introduced to represent the transition, while modulus and strength ratio (<i>σ</i><sub><i>mr</i></sub>) were correlated with joint parameters and relative dilatancy index (<i>I</i><sub><i>r</i></sub>). The strength ratio decreases exponentially with the modified joint factor <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:(\ge\:20)\)</EquationSource> </InlineEquation> to trigger a flow-controlled deformation. A pressure-sensitive parameter (<i>C</i><sub><i>hs</i></sub>) varies exponentially with the damage factor (<i>η</i><sub><i>hs</i></sub>) under varied initial conditions, indicating a shift from elastic to plastic flow. A relative dilatancy index (<i>I</i><sub><i>r</i></sub>) effectively captures rock behaviour among the classes, namely, a bifurcation zone (I<sub>r</sub> &gt; 5), a hardening-softening zone (0.1 &lt; <i>I</i><sub><i>r</i></sub> &lt; 3), and a stable zone (<i>I</i><sub><i>r</i></sub> &lt; 0.1). The proposed relative dilation-based rock mass classification (DRMC) integrates joint damage, confinement, volume change, and plastic flow into a unified framework.</p>

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Relative Dilation-Based Rock Mass Classification from Hardening and Softening Parameters in Laboratory and In-Situ Testing

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Ashutosh Trivedi,
  • Yakshansh Kumar

摘要

This study presents a comprehensive classification of rock masses undergoing dilation under varying confining pressures, joint configurations, and gouge conditions using data universe of laboratory and insitu tesing. A pressure and damage-sensitive plastic parameter has been introduced to represent the transition, while modulus and strength ratio (σmr) were correlated with joint parameters and relative dilatancy index (Ir). The strength ratio decreases exponentially with the modified joint factor \(\:(\ge\:20)\) to trigger a flow-controlled deformation. A pressure-sensitive parameter (Chs) varies exponentially with the damage factor (ηhs) under varied initial conditions, indicating a shift from elastic to plastic flow. A relative dilatancy index (Ir) effectively captures rock behaviour among the classes, namely, a bifurcation zone (Ir > 5), a hardening-softening zone (0.1 < Ir < 3), and a stable zone (Ir < 0.1). The proposed relative dilation-based rock mass classification (DRMC) integrates joint damage, confinement, volume change, and plastic flow into a unified framework.