浅埋复采工作面厚硬岩层–煤柱结构模型及其稳定性研究

doi:10.13722/j.cnki.jrme.2018.0825

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摘要

厚硬岩层和煤柱是浅埋复采工作面开采诱发动力灾害的主要因素。以山东高庄煤矿浅埋水采复采工作面为工程背景，为了揭示厚硬岩层运动和煤柱应力演化之间的关系及其组成系统失稳规律，提出采场“厚硬岩层–煤柱”结构模型，分析结构模型的不同岩层重力形式、范围大小和变形特征，推导出厚硬岩层岩梁在固支端集中力和周期破断步距表达式，并以此为基础，综合煤体煤柱“动–静”载应力与其综合支承强度之间关系，探讨了厚硬岩层–煤柱失稳的力学判据、煤柱应力变化特征及其灾害防控方法。研究结果表明：(1) 厚硬岩层条件下，水采复采工作面能够形成连续的“┤”型空间结构，包括水平方向的“传递体”和高度方向的“支撑体”，传递体周期性运动是形成支撑体煤柱煤体支承应力集中和转移的主要原因；(2) 煤柱煤体的静态支承应力p主要由支撑体受到的自身岩层重力(G和FL)与传递体转移岩层重力F2共同形成，传递体结构的厚硬岩梁破断运动是产生动载应力pd的主要原因，阐释了厚硬岩层–煤柱结构模型的I，II–1，II–2和II–3失稳类型。成果成功运用于3上301工作面开采实践，微震和应力监测等结果佐证了预测模型的合理性，并通过实施冲击防控措施，最终实现了工作面安全回采。

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	张明1
	成云海1
	王磊1
	姜福兴2
	李骐3

关键词 ：采矿工程, 浅埋煤层, 复采工作面, 厚硬岩层, 煤柱, 失稳判据, 灾害防控

Abstract：Thick hard strata and coal pillars are the main factors for the mining-induced dynamic disasters in shallow-buried re-mined panels. In order to reveal the relation between the thick hard strata movement and the evolution of the coal pillar stress and its instability regularities，the shallow-buried re-mined panels in Gaozhuang mine in Shandong Province，China，is investigated as the engineering background. A“thick hard strata-coal pillar”structure model of the stope is proposed，and the gravity form，range size and deformation features of different strata of the structure model are analyzed. An expression of the concentrated force of the solid support and the periodic breaking step of thick hard strata is derived，and the mechanical instability criterion of“Thick Hard Strata-Coal Pillar”，the variation features of the coal pillar stress，and disaster prevention and control methods are discussed considering the relationship between the“dynamic-static”loading stress of coal pillar and its comprehensive supporting strength. The research results indicate that the hydraulic re-mining panel can form a continuous“┤”type space structure under the condition of thick strata，which includes a horizontal“deliver body”and a vertical“support body”，and that the periodic motion of the“deliver body”is the main reason for the stress concentration and transfer of the coal pillar. It is also shown that the static support stress p of the coal pillar is mainly formed by the“support body”gravity(G and FL) and the“deliver body”transferring gravity F2，and the break motion of the thick strata of the“deliver body”is the main cause of the dynamic stress pd，which interprets the instability types of I，II–1，II–2 and II–3 of“Thick Hard Strata-Coal Pillar”structure model. The research results were successfully applied to the No.3upper301 panel and safe recovery of the panel was carried out by using prevention and control measures. The rationality of the prediction model was further proven by the microseismic and stress monitoring results.

Key words： mining engineering shallow-buried seam re-mined panels thick hard strata coal pillars instability criteria disaster prevention and control

引用本文:

张明1，成云海1，王磊1，姜福兴2，李骐3. 浅埋复采工作面厚硬岩层–煤柱结构模型及其稳定性研究[J]. 岩石力学与工程学报, 2019, 38(1): 87-100.
ZHANG Ming1，CHENG Yunhai1，WANG Lei1，JIANG Fuxing2，LI Qi3. Structure model and stability research of thick hard strata-coal pillar in shallow-buried re-mined panels. , 2019, 38(1): 87-100.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0825 或 http://www.rockmech.org/CN/Y2019/V38/I1/87

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