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<p>Coal mines are gradually becoming deeper in China. The strength and frequency of the roof weighting during deep coal seam mining are increasing. As a method of subsidence reduction by filling, overburden separation grouting is widely used in coal mines. However, the mine pressure behaviour during overburden separation grouting under deep coal seam mining conditions is not clear. Therefore, taking the Shilawusu Coal Mine as the engineering background, the mine pressure behaviour under overburden separation grouting is investigated by using numerical simulation and field monitoring. A numerical model of high-level overburden separation grouting in deep coal seam mining is established. The results show that the tensile stress concentration area of the surrounding rock is reduced by 40.8%. The maximum displacement of the surface is decreased by 14.2%, and the separation space of the overlying rock strata decreases by 21.7%. According to the analysis of field monitoring data, the maximum daily subsidence from all measurement points before and after overburden separation grouting is selected for comparison. The maximum daily subsidence is 3.5&#xa0;mm before grouting and decreases to 1.4&#xa0;mm after grouting. The abutment pressure area, as well as the maximum and average support resistance, is reduced by 27.9%, 34.2% and 11.1%, respectively. After overburden separation grouting, the overall stability of the rock is enhanced. Overburden separation grouting technology has achieved the effect of reducing the strength and times of the roof weighting. Based on the above research results, corresponding recommendations are proposed. This study can provide a theoretical reference for research on the behaviour and control of mine pressure in deep coal mines.</p>

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Research on Mine Pressure Behaviour of Overburden Separation Grouting in Deep Coal Mines

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Wei Li,
  • Xiufeng Zhang,
  • Hongke Gao,
  • Yang Chen,
  • Shuai Wang,
  • Guangpeng Li,
  • Kunbo Wu,
  • Jiuhong Wang

摘要

Coal mines are gradually becoming deeper in China. The strength and frequency of the roof weighting during deep coal seam mining are increasing. As a method of subsidence reduction by filling, overburden separation grouting is widely used in coal mines. However, the mine pressure behaviour during overburden separation grouting under deep coal seam mining conditions is not clear. Therefore, taking the Shilawusu Coal Mine as the engineering background, the mine pressure behaviour under overburden separation grouting is investigated by using numerical simulation and field monitoring. A numerical model of high-level overburden separation grouting in deep coal seam mining is established. The results show that the tensile stress concentration area of the surrounding rock is reduced by 40.8%. The maximum displacement of the surface is decreased by 14.2%, and the separation space of the overlying rock strata decreases by 21.7%. According to the analysis of field monitoring data, the maximum daily subsidence from all measurement points before and after overburden separation grouting is selected for comparison. The maximum daily subsidence is 3.5 mm before grouting and decreases to 1.4 mm after grouting. The abutment pressure area, as well as the maximum and average support resistance, is reduced by 27.9%, 34.2% and 11.1%, respectively. After overburden separation grouting, the overall stability of the rock is enhanced. Overburden separation grouting technology has achieved the effect of reducing the strength and times of the roof weighting. Based on the above research results, corresponding recommendations are proposed. This study can provide a theoretical reference for research on the behaviour and control of mine pressure in deep coal mines.