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<p>Ground fracturing technology is often used to treat hard roof in recent years. Current research on the mechanism of ground fracturing controlling hard roof mainly focuses on numerical simulation. However, the present numerical simulation methods reveal distinct limitations. Therefore, we developed a numerical model based on the material point method (MPM) to reveal the mechanism of ground fracturing. The model uses the convected particle domain interpolation (CPDI) technique to improve accuracy and a strain-softening model to describe the mechanical properties of rock mass. At first, the reliability of the model proposed in this study is verified by comparing the similar physical simulation test results of the same working face. Based on verification, hydraulic fractures are embedded in the 1# hard roof layer to simulate the impact of ground fracturing on the rock mass. Then the impact of hydraulic fractures on longwall mining is studied numerically. The results document that the hydraulic fractures are activated and communicated with the mining-induced fractures under the disturbance of excavation. This effect promotes the local slip caving of the hard roof, thereby reducing the advance abutment stress of the working face during the collapse of the hard roof.</p>

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Decoding the Hard Roof Control Mechanism of Ground Fracturing Based on the Material Point Method

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Binwei Xia,
  • Zikun Ma,
  • Lei Zhou,
  • Yanmin Zhou,
  • Yang Li

摘要

Ground fracturing technology is often used to treat hard roof in recent years. Current research on the mechanism of ground fracturing controlling hard roof mainly focuses on numerical simulation. However, the present numerical simulation methods reveal distinct limitations. Therefore, we developed a numerical model based on the material point method (MPM) to reveal the mechanism of ground fracturing. The model uses the convected particle domain interpolation (CPDI) technique to improve accuracy and a strain-softening model to describe the mechanical properties of rock mass. At first, the reliability of the model proposed in this study is verified by comparing the similar physical simulation test results of the same working face. Based on verification, hydraulic fractures are embedded in the 1# hard roof layer to simulate the impact of ground fracturing on the rock mass. Then the impact of hydraulic fractures on longwall mining is studied numerically. The results document that the hydraulic fractures are activated and communicated with the mining-induced fractures under the disturbance of excavation. This effect promotes the local slip caving of the hard roof, thereby reducing the advance abutment stress of the working face during the collapse of the hard roof.