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基于InSAR监测的鹤岗矿区地壳形变特征与冲击地压相关性研究

Research on the correlation between crustal deformation characteristics and impact geopressure in Hegang Mining Area based on INSAR monitoring

  • 摘要: 冲击地压是地质动力环境与开采工程扰动耦合作用的结果,矿区地壳形变特征是地质动力环境的重要影响因素之一,能够直观反映井下工作面开采上覆煤岩体结构受力变形−失稳的动态演化特征。而开采工程扰动又使得煤岩体的应力升高,能量积聚,达到煤岩临界条件时,则易诱发能量的瞬时释放,造成冲击地压的灾害发生。因此,矿区区域地壳形变特征与冲击地压之间有密切的联系。为了深入分析矿区地壳形变特征与冲击地压微震能量事件的关联,以鹤岗矿区的InSAR监测数据为基础,研究了富力煤矿、兴安煤矿和峻德煤矿地表形变的时空演化特征,并以峻德煤矿17层三四区二段工作面为例,选取了该区域的10个点位的InSAR监测结果,将其平均地壳形变量特征与冲击地压微震总能量进行综合分析,定量确定了大能量微震事件发生与区域地壳形变的“时−空−强”特征。研究表明:峻德煤矿井田地壳垂直形变量与17层微震事件总能量变化趋势是一致性达到69%,在时间频度上有较高的一致性。选取典型时段(2020−12−02—2021−12−28)24次大能量微震事件发生的能量大小与震中距与10个监测点位的平均形变量进行皮尔森相关性分析,得出微震能量大小与平均形变量呈正相关,相关系数为0.56,震中距与平均形变量呈负相关,相关系数为−0.75,反映了地壳形变特征与冲击地压的空间和强度关系,说明了InSAR监测在时间、空间、形变量与微震监测的微震事件有较高的匹配度。

     

    Abstract: Rock burst is the result of the coupling effect of geological dynamic environment and mining engineering disturbance. The crustal deformation characteristics of mining area are one of the important influencing factors of geological dynamic environment, which can directly reflect the dynamic evolution characteristics of stress deformation-instability of overlying coal and rock mass structure in underground working face mining. The disturbance of mining engineering increases the stress of coal and rock mass and accumulates energy. When the critical condition of coal and rock is reached, it is easy to induce the instantaneous release of energy and cause the disaster of rock burst. Therefore, there is a close relationship between the regional crustal deformation characteristics and rock burst in the mining area. In order to deeply analyze the relationship between the crustal deformation characteristics and the micro-seismic energy events of rock burst in the mining area, based on the InSAR monitoring data of Hegang mining area, the temporal and spatial evolution characteristics of surface deformation in Fuli coal mine, Xing’an coal mine and Junde coal mine were studied. Taking the second section of the working face of the 17-layer three-four area of Junde coal mine as an example, the InSAR monitoring results of 10 points in the region were selected, and the average crustal deformation characteristics and the total energy of rock burst micro-seismic were comprehensively analyzed, and the “time-space-strong” characteristics of the occurrence of high-energy micro-seismic events and regional crustal deformation were quantitatively determined. The research shows that the vertical deformation of the crust in the mine field of Junde Coal Mine is consistent with the total energy change trend of the 17-layer microseismic events, reaching 69%, and there is a high consistency in time frequency. The energy of 24 large-energy microseismic events in the typical period (2020−12−02—2021−12−28) and the average deformation of 10 monitoring points were selected for Pearson correlation analysis. It was concluded that the magnitude of microseismic energy was positively correlated with the average deformation, and the correlation coefficient was 0.56. The epicentral distance was negatively correlated with the average deformation, and the correlation coefficient was −0.75, which reflected the spatial and intensity relationship between crustal deformation characteristics and rock burst. It shows that InSAR monitoring has a high degree of matching with microseismic events in time, space, deformation and microseismic monitoring.

     

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