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<p>This study investigates the influence of temperature on the mechanical behavior of salt rock through multi-temperature and multi-confining pressure triaxial tests. The results indicate that increasing temperature significantly enhances the plastic deformation capacity of salt rock but leads to a systematic degradation of its macroscopic mechanical properties. When temperature rises from 40&#xa0;°C to 60&#xa0;°C, the peak strength decreases from 14.08&#xa0;MPa to 10.72&#xa0;MPa, accompanied by a 38% reduction in peak strain; the elastic modulus progressively declines from 0.97 GPa to 0.72 GPa, while Poisson’s ratio increases from 0.28 to 0.34. Based on systematic experimental evidence from the multi-temperature and multi-confining pressure triaxial tests, this research further reveals and clarifies the physical nature of tensile-dominated failure mechanisms in salt rock under compression. The failure process exhibits a four-stage progressive evolution: crack compaction (closure of initial defects) → radial expansion → internal crack propagation → external crack coalescence and failure. Building on this, a conceptual four-zone failure structure model (compacted zone, internal crack propagation zone, load-bearing zone, and external tensile failure zone) is established by integrating experimental observations with theoretical analysis. A quantitative tensile-dominated damage–failure criterion is also derived. The model clarifies that temperature accelerates the degradation process affecting failure, while stress acts as the direct driving force (with temperature being non-deterministic). The findings further elucidate the complete mechanism of tensile progressive failure in salt rock, coupling the four-stage evolution with the four-zone structure, thereby forming a comprehensive quantitative criterion system. This study provides a theoretical reference for damage evolution analysis in salt rock and the safety design of gas storage facilities.</p>

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Mechanical evolution of salt rock under temperature and construction of tensile-stress-dominated failure criterion

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Henglei Meng,
  • Weifeng Yang,
  • Chenxi Xu,
  • Andong Yang,
  • Yinzhou Chen

摘要

This study investigates the influence of temperature on the mechanical behavior of salt rock through multi-temperature and multi-confining pressure triaxial tests. The results indicate that increasing temperature significantly enhances the plastic deformation capacity of salt rock but leads to a systematic degradation of its macroscopic mechanical properties. When temperature rises from 40 °C to 60 °C, the peak strength decreases from 14.08 MPa to 10.72 MPa, accompanied by a 38% reduction in peak strain; the elastic modulus progressively declines from 0.97 GPa to 0.72 GPa, while Poisson’s ratio increases from 0.28 to 0.34. Based on systematic experimental evidence from the multi-temperature and multi-confining pressure triaxial tests, this research further reveals and clarifies the physical nature of tensile-dominated failure mechanisms in salt rock under compression. The failure process exhibits a four-stage progressive evolution: crack compaction (closure of initial defects) → radial expansion → internal crack propagation → external crack coalescence and failure. Building on this, a conceptual four-zone failure structure model (compacted zone, internal crack propagation zone, load-bearing zone, and external tensile failure zone) is established by integrating experimental observations with theoretical analysis. A quantitative tensile-dominated damage–failure criterion is also derived. The model clarifies that temperature accelerates the degradation process affecting failure, while stress acts as the direct driving force (with temperature being non-deterministic). The findings further elucidate the complete mechanism of tensile progressive failure in salt rock, coupling the four-stage evolution with the four-zone structure, thereby forming a comprehensive quantitative criterion system. This study provides a theoretical reference for damage evolution analysis in salt rock and the safety design of gas storage facilities.