Scholarlink

<p>This study investigates the mechanism of stress transfer during collaborative extraction of solid potash mine and describes the complete characteristics of pillar creep deformation. The fiber grating sensing system was used to monitor the evolution of stress and displacement fields, revealing the mechanisms of stress load transfer during this process. A superimposed Kelvin model was developed based on the generalized Kelvin model. Its applicability was validated using experimental data, and the sensitivity of the parameters was examined. The results showed that the load transfer mechanism during collaborative mining is associated with the release of strain energy in the roof. The pillars demonstrate phases of load incubation, load surge, and load drop. The stress load in the roof begins during the second exposure of the ore body in collaborative mining, marked by a significant jump in roof displacement. A sudden jump in the roof subsidence rate acts as a warning signal for potential delamination, indicating a substantial release of strain energy, and suggesting that the pillar is on the verge of transitioning from the gradual load increase phase to the load surge phase. The superimposed Kelvin model can more accurately capture the viscoelastic characteristics of solid potassium salt pillars in different creep stages. It is especially effective in capturing low strain information during the initial creep stage and describing behavioral changes in the long-term creep stage. Sensitivity analysis of key parameters shows that the viscosity coefficient (ƞ₁) is sensitive to the deformation trend during the decay creep stage, while the viscosity coefficient (ƞ₂) is more sensitive during the late slow change stage, further validating the advantages of the superimposed Kelvin model. Finally, the deformation of goaf in solid potash mine is predicted by computer application. The findings of this study have broad applications in research on ground pressure and creep deformation in solid potassium salt mining, addressing engineering challenges related to potassium salt extraction and the stability of rock salt tunnels.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on the Evolution of Ground Pressure During Collaborative Extraction and the Application of the Superimposed Kelvin Model in Solid Potash Mine

  • 期刊论文

  • 发表日期：

    2025年12月4日

查看全文
  • Luwei Zhang,
  • Yongxiang Ge,
  • Gaofeng Ren,
  • Congrui Zhang,
  • Xingyu Tan,
  • Chen Xu,
  • Pulin Kang

摘要

This study investigates the mechanism of stress transfer during collaborative extraction of solid potash mine and describes the complete characteristics of pillar creep deformation. The fiber grating sensing system was used to monitor the evolution of stress and displacement fields, revealing the mechanisms of stress load transfer during this process. A superimposed Kelvin model was developed based on the generalized Kelvin model. Its applicability was validated using experimental data, and the sensitivity of the parameters was examined. The results showed that the load transfer mechanism during collaborative mining is associated with the release of strain energy in the roof. The pillars demonstrate phases of load incubation, load surge, and load drop. The stress load in the roof begins during the second exposure of the ore body in collaborative mining, marked by a significant jump in roof displacement. A sudden jump in the roof subsidence rate acts as a warning signal for potential delamination, indicating a substantial release of strain energy, and suggesting that the pillar is on the verge of transitioning from the gradual load increase phase to the load surge phase. The superimposed Kelvin model can more accurately capture the viscoelastic characteristics of solid potassium salt pillars in different creep stages. It is especially effective in capturing low strain information during the initial creep stage and describing behavioral changes in the long-term creep stage. Sensitivity analysis of key parameters shows that the viscosity coefficient (ƞ₁) is sensitive to the deformation trend during the decay creep stage, while the viscosity coefficient (ƞ₂) is more sensitive during the late slow change stage, further validating the advantages of the superimposed Kelvin model. Finally, the deformation of goaf in solid potash mine is predicted by computer application. The findings of this study have broad applications in research on ground pressure and creep deformation in solid potassium salt mining, addressing engineering challenges related to potassium salt extraction and the stability of rock salt tunnels.