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<p>Huge-thick overlying strata(HTOS) is characterized by substantial thickness, high mechanical strength, excellent load-bearing capacity, and remarkable elastic energy storage potential. Its sudden collapse tends to induce rock bursts due to the abrupt release of accumulated elastic energy. This study analyzes the layered bearing characteristics of the HTOS and reveals secondary fracturing and weakening mechanism. The bearing strength of the HTOS decreases significantly with the increase of the hanging roof length and the number of layered strata. After the implementation of the secondary fracturing and weakening treatment, the HTOS is fragmented into small-sized rock blocks, and the "three-zone" structure of the overlying strata is clearly formed. Meanwhile, the total energy released by microseismic events is reduced by 36.98% compared with that before. The average periodic weighting interval is shortened from 35.24 to 16.57 m, representing a reduction of 52.98%, and the peak weighting pressure is reduced from 8179.58 to 5618.49 kN, a decrease of 31.32%. The bearing strength of the HTOS has been effectively reduced, and the hazard of ground pressure impact has been significantly mitigated.</p>

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Instability characteristics and secondary fracturing and weakening mechanism of huge-thick overlying strata in shallow stope

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月6日

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  • Zhang Xiaowu,
  • Cao Yue,
  • Lu Weiyong,
  • Sun Yaohui,
  • Shi Lei,
  • Xu Zhijun,
  • Tai Lianhai

摘要

Huge-thick overlying strata(HTOS) is characterized by substantial thickness, high mechanical strength, excellent load-bearing capacity, and remarkable elastic energy storage potential. Its sudden collapse tends to induce rock bursts due to the abrupt release of accumulated elastic energy. This study analyzes the layered bearing characteristics of the HTOS and reveals secondary fracturing and weakening mechanism. The bearing strength of the HTOS decreases significantly with the increase of the hanging roof length and the number of layered strata. After the implementation of the secondary fracturing and weakening treatment, the HTOS is fragmented into small-sized rock blocks, and the "three-zone" structure of the overlying strata is clearly formed. Meanwhile, the total energy released by microseismic events is reduced by 36.98% compared with that before. The average periodic weighting interval is shortened from 35.24 to 16.57 m, representing a reduction of 52.98%, and the peak weighting pressure is reduced from 8179.58 to 5618.49 kN, a decrease of 31.32%. The bearing strength of the HTOS has been effectively reduced, and the hazard of ground pressure impact has been significantly mitigated.