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<p>The reservoir area is characterized by numerous landslide and collapse hazards, with severe rock degradation. The rock masses within the hydro-fluctuation belt undergo progressive degradation under repeated dry–wet cycles and the gravitational stress from overlying strata, which substantially increases the likelihood of landslide initiation. Understanding the degradation behavior of rock under dry–wet cycling and coupling stress is essential for evaluating the stability of hazardous rock masses and predicting geological disasters. Based on field investigations conducted in the Three Gorges Reservoir (TGR) area, a hydrodynamic-stress-chemical corrosion (HSCC) multi-field coupling experimental system was designed. CT scanning and uniaxial compression tests were subsequently carried out, and a coupled damage constitutive model that accounts for the compaction stage was developed. The results indicate that under the coupled action of dry–wet cycling and coupling stress, numerous microcracks develop within the limestone, and the porosity increases with both the dry–wet cycling and coupling stress. Under a stress of 2&#xa0;MPa, porosity increased by 3.43 times after 20 cycles. Limestone subjected to high coupling stress experiences a more significant degradation in its physical and mechanical properties. The uniaxial compressive strength decreased by an average of 2.85% per cycle under 2&#xa0;MPa stress. Furthermore, different coupling stresses and dry–wet cycling periods significantly affect the compression failure modes of limestone specimens, causing a transition from tensile-shear-splitting combined failure to pure splitting failure. The piecewise constitutive model based on micropore strain can reasonably describe the damage evolution process of limestone.</p>

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Physical and Mechanical Behavior of Limestone Subjected to Dry–Wet Cycles and Coupling Stress Conditions

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Zhongping Yang,
  • Miao Liu,
  • Yiming Zhang,
  • Yuhao Gao,
  • Shanmeng Hou,
  • Hongming Li

摘要

The reservoir area is characterized by numerous landslide and collapse hazards, with severe rock degradation. The rock masses within the hydro-fluctuation belt undergo progressive degradation under repeated dry–wet cycles and the gravitational stress from overlying strata, which substantially increases the likelihood of landslide initiation. Understanding the degradation behavior of rock under dry–wet cycling and coupling stress is essential for evaluating the stability of hazardous rock masses and predicting geological disasters. Based on field investigations conducted in the Three Gorges Reservoir (TGR) area, a hydrodynamic-stress-chemical corrosion (HSCC) multi-field coupling experimental system was designed. CT scanning and uniaxial compression tests were subsequently carried out, and a coupled damage constitutive model that accounts for the compaction stage was developed. The results indicate that under the coupled action of dry–wet cycling and coupling stress, numerous microcracks develop within the limestone, and the porosity increases with both the dry–wet cycling and coupling stress. Under a stress of 2 MPa, porosity increased by 3.43 times after 20 cycles. Limestone subjected to high coupling stress experiences a more significant degradation in its physical and mechanical properties. The uniaxial compressive strength decreased by an average of 2.85% per cycle under 2 MPa stress. Furthermore, different coupling stresses and dry–wet cycling periods significantly affect the compression failure modes of limestone specimens, causing a transition from tensile-shear-splitting combined failure to pure splitting failure. The piecewise constitutive model based on micropore strain can reasonably describe the damage evolution process of limestone.