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复杂地质动力环境下冲击地压的影响因素与分布特征

Influencing factors and distribution characteristics of rock burst under complex geological dynamic environment

  • 摘要: 冲击地压是多项因素耦合作用的结果。冲击地压的发生不仅与开采工程效应有关,还与矿井所处的地质动力环境紧密相关,特别是在复杂地质动力环境下,冲击地压的发生更加频繁。为研究复杂地质动力环境下冲击地压的影响因素,采用理论分析、微震监测分析、地质勘探等方法,以耿村煤矿12240工作面作为研究对象,分析耿村煤矿地质动力环境特征,评判耿村煤矿发生冲击地压的危险性。计算12240工作面冲击地压发生的临界深度,采用已发生冲击地压和大能量微震事件对临界深度进行验证,揭示冲击地压发生震源深度的关系。采用“冲击地压的三条件准则”对微震事件的发生频次、能量,以及空间位置的分布规律进行分析。通过分析12240工作面顶板预裂爆破前后的微震事件频次及能量的变化规律,以及顶板预裂爆破后孔壁的窥视结果,对12240工作面采取的远场解危措施的效果性进行验证。结果表明:耿村煤矿具备中等矿井动力灾害的地质动力环境,属于严重冲击地压矿井。耿村煤矿冲击地压发生的临界深度为标高−545.79 m,12240工作面埋深已临近冲击地压发生临界深度,具备冲击地压发生危险。F16断层作为耿村煤矿的主要地质构造因素,是地质动力环境的重要构成,为大能量冲击地压的孕育和发生提供了能量基础;采动效应是冲击地压发生的充分条件,对12240工作面初采期间冲击地压的影响较小;解危措施是控制条件,有效降低了12240工作面冲击地压发生的危险。研究成果可为防治复杂地质动力环境下冲击地压等矿井动力灾害提供依据和参考。

     

    Abstract: Rock burst results from the interaction of multiple factors. Its occurrence is not only related to mining engineering effects but also closely linked to the geo-dynamic environment of the mine. In complex geodynamic conditions, rock burst occurs more frequently. To study the influencing factors of rock burst in such environments, methods such as theoretical analysis, field monitoring, and geological exploration are employed, with 12240 working face of Gengcun Coal Mine as the research subject. The study analyzes the geodynamic environment characteristics of Gengcun Coal Mine and assesses the risk of rock burst. The critical depth for rock burst at 12240 working face is calculated, and this depth is verified using rock burst and large energy microseismic events, revealing the relationship between the occurrence depth of rock burst and its source. The “three-condition criterion for rock burst” is used to analyze the frequency, energy, and spatial distribution of microseismic events. By analyzing changes in the frequency and energy of microseismic events before and after roof pre-splitting blasting at 12240 working face, and examining the results from borehole inspections after pre-splitting blasting, the effectiveness of the far-field hazard mitigation measures for 12240 working face is verified. The research results indicate that Gengcun Coal Mine has a medium level of geo-dynamic disaster environment and is a serious rock burst mine. The critical depth for rock burst occurrence at Gengcun Coal Mine is an elevation of −545.79 meters. The burial depth of 12240 working face is close to this critical depth, indicating a risk of rock burst. The F16 fault, as a major geological structural factor at Gengcun Coal Mine, is an important component of the geo-dynamic environment and provides an energy basis for the formation and occurrence of high-energy rock burst. Mining effects are a sufficient condition for rock burst but have little impact on 12240 working face during the initial mining period. Hazard mitigation measures are control conditions that effectively reduce the risk of rock burst at 12240 working face. The research results provide a basis and reference for preventing and controlling dynamic disasters such as rock burst in complex geodynamic environments.

     

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