兖州矿区冲击地压发生主控因素和防治方法

    The main controlling factors and prevention methods of rock burst in Yanzhou Mining Area

    • 摘要: 兖州矿区是鲁西大型煤炭基地的核心区,对华东能源稳定供应具有重要战略意义。随着开采深度增加,冲击地压已成为制约该矿区煤炭资源安全高效开采的主要动力灾害。本文以东滩煤矿、鲍店煤矿、南屯煤矿、兴隆庄煤矿、济二煤矿、济三煤矿等为研究对象,系统分析地质条件、开采条件和冲击地压事件的相关性,厘清主控因素并划分冲击矿井类型;总结现有监测预警技术的适用性及局限性,综述冲击地压防治技术及发展趋势。研究结果表明,应力环境和煤层赋存特征是兖州矿区冲击地压发生的共性根本内因,但不同矿井的主导诱因存在差异:东滩煤矿、鲍店煤矿受厚硬顶板破断影响,南屯煤矿、兴隆庄煤矿主要受构造应力控制,济二煤矿、济三煤矿以煤柱应力集中诱发为主;顶板关键层的厚度、岩性及其与煤层的空间关系对能量释放方式具有重要影响。基于此,将矿井冲击地压划分为厚硬顶板型、构造应力控制型和煤柱型三类。监测预警方面,微震监测法、应力监测法和钻屑法等方法均具有较好效果,但也存在不同程度局限:微震能量与震级缺乏统一理论与标准,导致解释结果存在不确定性;煤层应力监测精度不足、误报率较高;钻屑法的准确性和适用范围有限。防治方面,提出“区域源头控制与局部卸压相结合”的控制思路:区域层面通过优化开采布局和保护层开采削减应力集中,局部层面通过钻孔卸压、超深孔爆破、煤层注水等措施实现能量释放与冲击危险削弱。但目前对于防治措施仍缺乏及时、精准的评估手段,实际成效难以量化。研究成果为兖州矿区冲击地压防治提供了理论依据与工程实践支撑,并对类似条件深部矿井的动力灾害防治提供参考。

       

      Abstract: The Yanzhou Mining Area is the core region of a large coal base in western Shandong and holds significant strategic importance for the stable energy supply in East China. With increasing mining depth, rock burst has become the main dynamic hazard restricting the safe and efficient extraction of coal resources in this mining area. This study focuses on typical coal mines such as Dongtan, Baodian, Nanzhun, Xinglongzhuang, Ji-2, and Ji-3, systematically analyzing the correlation between geological and mining conditions and rock burst events, clarifying the main controlling factors, and classifying types of rock burst-prone mines. The applicability and limitations of existing monitoring and early warning technologies are summarized, and rock burst prevention and control technologies and development trends are reviewed. The study shows that stress environment and coal seam occurrence characteristics are common fundamental internal factors for rock bursts in the Yanzhou Mining Area, but the dominant triggers vary among different mines: Dongtan and Baodian mines are affected by the fracture of thick, hard roof strata; Nanzhun and Xinglongzhuang mines are mainly controlled by tectonic stress; Ji-2 and Ji-3 mines are primarily triggered by stress concentration in coal pillars. The thickness, lithology, and spatial relationship of key roof strata with coal seams significantly influence the mode of energy release. Based on this, rock bursts in mines are classified into three types: thick hard roof type, tectonic stress-controlled type, and coal pillar type. In terms of monitoring and early warning, methods such as microseismic monitoring, stress monitoring, and drilling cuttings analysis have achieved good results but also exhibit certain limitations: there is no unified theory or standard for microseismic energy and magnitude, leading to uncertainty in interpretations; coal seam stress monitoring lacks precision and has a high false alarm rate; the accuracy and applicability of the drilling cuttings method are limited. For prevention and control, a strategy of “regional source control combined with local pressure relief” is proposed: at the regional level, optimizing mining layout and mining protective layers can reduce stress concentration; at the local level, measures such as borehole pressure relief, deep-hole blasting, and coal seam water injection can release energy and reduce rock burst risks. However, timely and accurate evaluation methods for these control measures are still lacking, and their actual effectiveness is difficult to quantify. The research results provide theoretical basis and engineering practice support for rock burst prevention in the Yanzhou Mining Area and offer a reference for dynamic hazard prevention in deep mines under similar conditions.

       

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