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<p>One of the most important factors in storage cavern design is preventing rock salt dilation caused by the growth of microcracks under deviatoric loading conditions. In this study, the dilation strength of rock salt was investigated under different true triaxial loading conditions. Considering the operating conditions of the employed true triaxial loading device, the loading was applied on the cubic rock salt samples under constant values of minimum principal stress and Lode angle. In loading condition of zero minimum principal stress, the sample exhibits a strain-softening behavior accompanied by rupture. In confined conditions, the sample behaves as strain hardening, with plastic deformations and no distinguishable fracture surface. Based on a new approach presented in this work, the average values of Young’s modulus and Poisson’s ratio were calculated as 1.66 GPa and 0.4, respectively, using true triaxial test results. Because of lower mean square error, the assumption of the associated flow rule was used to determine the Drucker–Prager and Mohr–Coulomb parameters. The dilation boundary points under various loading conditions were established by simulating true triaxial tests using the given mechanical and strength parameters. Based on the proposed dilation boundary criterion, the dilation strength is linearly related to the minimum principal stress for a particular loading ratio (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\sigma}_{1}={A}_{r}+{B}_{r}{\sigma}_{3}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>σ</mi> <mn>1</mn> </msub> <mo>=</mo> <msub> <mi>A</mi> <mi>r</mi> </msub> <mo>+</mo> <msub> <mi>B</mi> <mi>r</mi> </msub> <msub> <mi>σ</mi> <mn>3</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>). At confining stresses &lt;&#xa0;5&#xa0;MPa, increasing the intermediate stress leads to an increase in the dilation strength of rock salt; however, at higher values this trend reverses.</p>

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Analytical and Experimental Study of Rock Salt Plasticity and Dilation Under True Triaxial Loading Conditions

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Abbas Maadikhah,
  • Ali Mortazavi,
  • Hamed Molladavoodi,
  • Hadi Atapour

摘要

One of the most important factors in storage cavern design is preventing rock salt dilation caused by the growth of microcracks under deviatoric loading conditions. In this study, the dilation strength of rock salt was investigated under different true triaxial loading conditions. Considering the operating conditions of the employed true triaxial loading device, the loading was applied on the cubic rock salt samples under constant values of minimum principal stress and Lode angle. In loading condition of zero minimum principal stress, the sample exhibits a strain-softening behavior accompanied by rupture. In confined conditions, the sample behaves as strain hardening, with plastic deformations and no distinguishable fracture surface. Based on a new approach presented in this work, the average values of Young’s modulus and Poisson’s ratio were calculated as 1.66 GPa and 0.4, respectively, using true triaxial test results. Because of lower mean square error, the assumption of the associated flow rule was used to determine the Drucker–Prager and Mohr–Coulomb parameters. The dilation boundary points under various loading conditions were established by simulating true triaxial tests using the given mechanical and strength parameters. Based on the proposed dilation boundary criterion, the dilation strength is linearly related to the minimum principal stress for a particular loading ratio ( \({\sigma}_{1}={A}_{r}+{B}_{r}{\sigma}_{3}\) σ 1 = A r + B r σ 3 ). At confining stresses < 5 MPa, increasing the intermediate stress leads to an increase in the dilation strength of rock salt; however, at higher values this trend reverses.