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<p>To advance the utilization of desulfurization gypsum in lining support structures, this study conducted triaxial permeability tests on lining concrete with desulfurized gypsum under conditions of continuous loading and graded cyclic loading and unloading, simulated the service environment under high stress and high water pressure. The findings reveal that the peak strength of specimens subjected to graded cyclic loading and unloading is generally inferior to those under continuous loading, exhibiting a reduction of up to 32.36%. Notably, during the graded cyclic loading and unloading process, as the number of cycles increases, the elastic modulus of the specimens decreases by an average of 8.04%, while Poisson’s ratio increases by an average of 11.96%. Furthermore, both the elastic and plastic strains exhibit substantial growth, with averages of 37.46% and 106.06%, respectively. Key permeability parameters, including initial permeability (K<sub>0</sub>), minimum permeability (K<sub>min</sub>), permeability at maximum volume compression (K<sub>c</sub>), and permeability at peak stress (K<sub>max</sub>), were identified as critical indicators of permeability throughout the stress–strain process. It was observed that these permeability indicators generally increase with higher confining pressure and decrease with higher water pressure. Based on the post-peak permeability development characteristics, a permeability evolution model was proposed. This model effectively describes three distinct post-peak permeability trends: a linear decrease, an initial increase followed by a decrease, and a linear increase. The findings provided valuable guidance for the application of desulfurization gypsum in the development of lining and support materials.</p>

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Deformation, mechanical and dynamic permeability properties of green lining concrete with desulfurization gypsum

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Weipei Xue,
  • Ming Zhao,
  • Linfeng Xu,
  • Chuanxin Rong,
  • Zhaibang Ke,
  • Yaya Zhou,
  • Wen Yang

摘要

To advance the utilization of desulfurization gypsum in lining support structures, this study conducted triaxial permeability tests on lining concrete with desulfurized gypsum under conditions of continuous loading and graded cyclic loading and unloading, simulated the service environment under high stress and high water pressure. The findings reveal that the peak strength of specimens subjected to graded cyclic loading and unloading is generally inferior to those under continuous loading, exhibiting a reduction of up to 32.36%. Notably, during the graded cyclic loading and unloading process, as the number of cycles increases, the elastic modulus of the specimens decreases by an average of 8.04%, while Poisson’s ratio increases by an average of 11.96%. Furthermore, both the elastic and plastic strains exhibit substantial growth, with averages of 37.46% and 106.06%, respectively. Key permeability parameters, including initial permeability (K0), minimum permeability (Kmin), permeability at maximum volume compression (Kc), and permeability at peak stress (Kmax), were identified as critical indicators of permeability throughout the stress–strain process. It was observed that these permeability indicators generally increase with higher confining pressure and decrease with higher water pressure. Based on the post-peak permeability development characteristics, a permeability evolution model was proposed. This model effectively describes three distinct post-peak permeability trends: a linear decrease, an initial increase followed by a decrease, and a linear increase. The findings provided valuable guidance for the application of desulfurization gypsum in the development of lining and support materials.