基于沉积控压规律的鄂尔多斯盆地中深部矿井冲击危险性分区评价

Risk assessment of rock burst in middle deep mines,the northern Ordos basin based on depositional controlling theory

为解决鄂尔多斯盆地北部深埋煤层开采普遍面临的冲击地压问题,在煤层覆岩沉积地质特征研究基础上,以M煤矿为例,分析了微震事件的平面展布规律及其与沉积地质环境、主关键层厚度、主关键层与煤层间距、煤层厚度、岩心采取率之间的关联性,结果表明沉积地质条件是影响微震事件的重要因素。利用灰色关联度法对影响冲击危险性的5个主控因素进行了影响程度排序,采用层次分析法确定了各因素的权重值,在ArcGIS平台上建立了各主控因素专题图,构建了冲击危险性评价模型,对矿井的冲击危险性进行了分区评价,并与工作面开采过程中微震事件实际观测数据进行了对比验证,结果表明分区评价结果与实际观测结果吻合程度较高,证明了基于沉积地质条件分析的冲击地压危险性评价结果的正确性。研究结果可为矿井冲击地压防治工作提供一种新的参考方法。

To unravel the widely-encountered rock burst issues during deep coal seam mining in the northern Ordos basin,supported the study of sedimentary geological characteristics of coal seam overburden,the correlation of the planar distribution pattern of microseismic energy events with its correlation with the depositional geological environment,the thickness of the main key strata,spacing between main key strata and coal seam,the thickness of coal seam associate core rate of rock layer was analyzed by taking M coal mine as an example.The results show that the depositional geological condition area is a significant factor affecting the microseismic energy events.The grey correlation degree technique was used to rank the influence degree of the five main controlling factors affecting the impact risk,and the weight value of each factor was determined by the analytic hierarchy process.The thematic map of the main controlling factors were established on the ArcGIS platform and the impact ground pressure risk evaluation model was developed,which was used to evaluate the impact risk of the mine by sectionalization.By comparison with the actual observation data of microseismic energy events during the work face mining,the sectionalization analysis results show a good agreement with the actual observation results,which proved the validity of the impact hazard analysis results of rock burst based on the analysis of depositional geological conditions.The study provided a new reference technique for the prevention and controlling of rock burst in mines.