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<p>Double-cutting top-retention mining is one of the important directions for sustainable coal development, and its mining-induced overburden fissure evolution law determines the response of unloading gas extraction projects. This paper used physical analog modeling experiments to compare and analyze the overburden fissure evolution laws induced by double-roof-cutting and conventional mining methods. The results show that double-cutting roof alley mining has a significant controlling effect on roof decompression, settlement, and fissure development, and the basic roof subsidence of the interlayer after cutting the roof is small, with the maximum subsidence of 9.85&#xa0;mm; the rock layer after the roof collapse in conventional mining is more fragmented, and the range of fissure development is larger than that in double-roof-cutting with retained roadway conditions, having the maximum subsidence of 13.65&#xa0;mm. The latter achieves a more uniform overall settlement by decompressing the roof and making the angle of collapse, fissure development height, and width smaller than under conventional mining. The double-roof-cutting mining reduces the degree of stress concentration in the surrounding rock, promotes the settlement of the roof and the time of the first pressure, improves the stability of the roadway, and forms an effective gas transport channel through the roof slit.</p>

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Evolution of overburden fissures induced by mining in double-cutting top-retention lanes

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月1日

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  • Xitu Zhang,
  • Xiaobo Lv,
  • Shengyong Hu,
  • Jun Nian,
  • Chunsheng Deng,
  • Fengyu Fan,
  • Limin Du

摘要

Double-cutting top-retention mining is one of the important directions for sustainable coal development, and its mining-induced overburden fissure evolution law determines the response of unloading gas extraction projects. This paper used physical analog modeling experiments to compare and analyze the overburden fissure evolution laws induced by double-roof-cutting and conventional mining methods. The results show that double-cutting roof alley mining has a significant controlling effect on roof decompression, settlement, and fissure development, and the basic roof subsidence of the interlayer after cutting the roof is small, with the maximum subsidence of 9.85 mm; the rock layer after the roof collapse in conventional mining is more fragmented, and the range of fissure development is larger than that in double-roof-cutting with retained roadway conditions, having the maximum subsidence of 13.65 mm. The latter achieves a more uniform overall settlement by decompressing the roof and making the angle of collapse, fissure development height, and width smaller than under conventional mining. The double-roof-cutting mining reduces the degree of stress concentration in the surrounding rock, promotes the settlement of the roof and the time of the first pressure, improves the stability of the roadway, and forms an effective gas transport channel through the roof slit.