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内蒙古矿区矿震发生特点及防控对策与实践

Characteristics, control strategies, and practices of mining-induced seismicity in Inner Mongolian Mining Areas

  • 摘要: 我国煤炭资源开发重心已向西部矿区优势资源快速转移,期间大规模、高强度开采诱使2.0级及以上矿震活动频发。2024年内蒙古原煤产量跃居全国第一,但矿震灾害尤为突出。为有效遏制内蒙古矿区矿震突增势头,统计了内蒙古矿震频发矿井地质沉积特征,梳理了自2020年以来发生的26起2.0级及以上矿震案例,总结了矿震发生特点及发展趋势,结合地表岩移监测与覆岩离层观测结果,初步揭示了复杂沉积地层破断活动特征对频发矿震活动的影响的特殊性,明确了矿震发生原因,提出了以主动卸压、减沉降载和生产布局优化为指导的矿震防控思路,并在受矿震严重制约生产的矿井开展了防控工业性试验。结果表明:内蒙古频发矿震矿区白垩系地层经历河流与风化沉积且发生大规模碳酸胶结作用,与下伏侏罗系地层形成重大不整合面,整体赋存形态和力学属性均表现出“骤变型”空间展布特征,造成了内蒙古煤矿矿震发生规律与机理的独特性;矿震多发生在邻空开采期间,震源位于采空区,对井上下几乎没有影响,发生过矿震的工作面复产期间降速开采甚至停产仍会再次发生矿震,凸显了矿区内覆岩断裂诱发矿震的复杂性;对矿震起控制作用的岩层动态变化,矿震发生后,地表快速下沉呈“阶梯式”,引起矿震的岩层及其上覆岩层内部裂隙快速扩展,裂隙扩展范围的所有岩层错动失稳均可能诱发矿震,这是内蒙古煤矿矿震难以有效防控的主要原因;矿震防控工程实施后,白垩系地层积聚能量稳步释放,地表沉降得到有效控制,减震效果显著;通过优化开采布局,降低了高强度开采带来的不利影响,实现源头防控矿震的同时,也促进了内蒙古煤矿矿震与冲击地压协同主动调控技术升级,对于后续矿井产能稳步释放具有重要意义。研究成果可促进对内蒙古矿区矿震的理性认识,并可为矿震有效防控提供宝贵思路。

     

    Abstract: China’s coal resource development has rapidly shifted toward the western mining areas with superior resources, during which large-scale and high-intensity mining has induced frequent seismicity of magnitude 2.0 and above. In 2024, Inner Mongolia’s raw coal production ranked first nationwide, but mining-induced seismicity (MIS) were particularly severe. To effectively curb the surge of MIS in Inner Mongolian Mining Areas, the geological and sedimentary characteristics of mines affected by MIS were analyzed. Twenty-six cases of mining-induced seismic events of magnitude 2.0 and above since 2020 were reviewed to summarize their occurrence characteristics and development trends. Based on surface displacement monitoring and overlying rock separation observations, the study preliminarily revealed the specific influence of complex sedimentary strata fracturing on frequent MIS. The causes of MIS were clarified, and control strategies including active pressure relief, reduction of subsidence load, and optimization of production layout were proposed. Industrial-scale experiments were conducted in mines severely affected by MIS to validate the effectiveness of the proposed strategies. The results indicate that the Cretaceous strata in the mining areas affected by MIS in Inner Mongolia experienced fluvial and weathering deposition and underwent extensive carbonate cementation, forming significant unconformities with the underlying Jurassic strata. Their overall occurrence patterns and mechanical properties exhibit abrupt spatial variations, resulting in the unique regularity and mechanisms of MIS in Inner Mongolian coal mines. MIS predominantly occur during adjacent goaf mining, with sources located in goaf areas and negligible impact on underground workings and the surface. Even when previously affected working faces resume production at reduced speed or are temporarily suspended, MIS may recur, highlighting the complexity of MIS induced by overlying rock fractures. The strata that control MIS are not fixed but dynamically change. After MIS occurrence, the surface subsides rapidly in a step-like manner, and fractures within the causative strata and overlying rocks propagate quickly. Destabilization of any strata within the extended fracture zone may trigger further MIS, which is the main reason why MIS in Inner Mongolian coal mines is difficult to control effectively. Following the implementation of control engineering, accumulated energy in the Cretaceous strata was steadily released, surface subsidence was effectively mitigated, and the frequency of MIS was significantly reduced. Optimizing the mining layout reduces adverse effects from high-intensity mining and controls MIS at its source, thereby facilitating coordinated active regulation of MIS and rock bursts, which is essential for the stable release of mine production capacity. These findings advance a rational understanding of MIS in Inner Mongolian mining areas and can offer valuable approaches for the effective control of MIS.

     

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