急倾斜巨厚煤层组开采煤岩体联动诱冲机制与防冲调控

doi:10.13722/j.cnki.jrme.2022.0558

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摘要针对急倾斜巨厚煤层组开采时岩柱及顶板悬空致使动力灾害严重的现状，综合运用理论分析、现场监测等研究方法，构建岩柱、顶板力学模型，并推导表征岩柱、顶板弯矩和能量演化规律的表达式，研究随采深增加岩柱、顶板弯曲变形及能量演化的规律，评估不同煤层开采的冲击危险性，分析诱冲机制并提出防冲策略及方案。研究结果表明：(1) 急倾斜巨厚煤层组开采时，随采深增加岩柱、顶板弯曲变形和能量蓄积均呈非线性加速变化，且回采阶段内弯曲变形严重、能量蓄积更高。采深300 m后能量急剧增加，确定该采深为冲击灾害发生临界值。(2) B1+2煤层回采时，岩柱撬转、能量积聚均较B3+6煤层回采时小，评估得出回采B1+2煤层的冲击危险性较回采B3+6煤层时小。相比岩柱，B3+6煤层顶板的弯曲变形更严重，能量蓄积更高。(3) 确定冲击易发区域为各应力峰值叠加位置。冲击力源有静载和动载，静载是冲击发生的基础条件，为蓄能作用；动载为诱冲作用，动静载联动作用诱发冲击。(4) 防冲的关键是弱化静载，B3+6煤层回采时需加强防治，重点防治对象为岩柱及顶板，重点防治区域为各应力峰值叠加位置。现场实施岩柱、顶板爆破及煤体注水后，有效弱化了静载水平，防冲调控效果良好。上述研究结果对乌东煤矿急倾斜巨厚煤层组开采时冲击地压灾害的防治提供了科学依据。

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	崔峰1
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	张随林1
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	来兴平1
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	陈建强4
	贾冲1
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	冯港归1
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	孙敬轩1
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关键词 ：采矿工程, 急倾斜巨厚煤层组, 弯曲变形, 能量蓄积, 诱冲机制, 防冲调控

Abstract：In view of the serious dynamic disaster caused by the hanging of the rock pillar and roof during the mining of steeply-inclined and extremely-thick coal seam group，by using comprehensive theoretical analysis，field monitoring and other research methods，a mechanical model of the rock pillar and roof was built and the expression representing the bending moment and energy evolution law of the rock pillar and roof was deduced，the law of the bending deformation and energy evolution of the rock pillar and roof with the increase of mining depth was studied，the impact risk of different coal seams was evaluated，the induced impact mechanism was analyzed，and the anti-impact strategy and scheme were put forward. The results show that：(1) with the increase of mining depth，the bending deformation and energy accumulation of rock pillar and roof in steeply-inclined and extremely-thick coal seam group show nonlinear acceleration changes，and the bending deformation is more serious and the energy accumulation is higher in the mining stage. After the mining depth of 300 m，the energy increased sharply，and it was determined that the mining depth was the critical value of impact disaster. (2) Rock pillar pry and energy accumulation in B1+2 coal seam mining are smaller than those in B3+6 coal seam mining，and the impact risk in B1+2 coal seam mining is smaller than that in B3+6 coal seam mining. Compared with the rock pillar，the bending deformation of B3+6 coal seam roof is more serious and the energy accumulation is higher. (3) Determine the impact prone area as the superposition position of each stress peak. The sources of impact force include static load and dynamic load，and static load is the basic condition of impact，which is the energy storage function. The dynamic load is the induced impact，and the dynamic and static loads act together to induce the impact. (4) The key to prevent scour is to weaken the static load. It is necessary to strengthen prevention and control in B3+6 coal seam mining. The key prevention and control objects are rock pillars and roof， and the key prevention and control areas are the superposition positions of stress peaks. After the rock pillar and roof blasting was carried out on site，the static load level was effectively weakened after the coal was injected with water，and the anti-scour control effect was good. The above research results provide a scientific basis for the prevention and control of rock burst disasters in steep and thick coal seam mining in Wudong Coal Mine.

Key words： mining engineering steeply-inclined and extremely-thick coal seam group bending deformation energy accumulation mechanism of induced rockburst prevention and control rock burst

引用本文:

崔峰1，2，3，张随林1，2，来兴平1，2，陈建强4，贾冲1，2，冯港归1，2，孙敬轩1，2. 急倾斜巨厚煤层组开采煤岩体联动诱冲机制与防冲调控[J]. 岩石力学与工程学报, 2023, 42(S1): 3226-3241.
CUI Feng1，2，3，ZHANG Suilin1，2，LAI Xingping1，2，CHEN Jianqiang4，JIA Chong1，2，FENG Ganggui1，2，SUN Jingxuan1，2. Coal and rock mass linkage induced impact mechanism and prevention and control rock burst in steeply-inclined and extremely-thick coal seam group. , 2023, 42(S1): 3226-3241.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0558 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3226

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