下组煤层底板奥灰突水脆弱性评价分析

Evaluation Analysis on Floor Water Inrush Vulnerability of Ordovician Limestone in Down Group Seams

为解决保利合盛煤业公司某矿带压开采过程中,面临下组煤层底板奥灰突水的潜在威胁问题,通过对矿井煤层地质条件和水文地质条件的分析,确定选取影响下组煤层底板奥灰突水脆弱性评价的9个因素作为主控因素,应用GIS对主控因素数据进行采集并归入化处理后建立主控因素图层,然后运用层次分析法(AHP)确定各主控因素的权重比例后,对指数进行频率直方图统计分析,按照相应的阈值将矿井划分成突水安全区、较安全区、过渡区、较脆弱区和脆弱区等5个区域。研究结果表明:在矿区范围内10号、11号煤层底板奥灰突水区域呈西向东由较安全区、过渡区过渡至较脆弱区,局部构造区域为突水脆弱区。

In order to solve the potential danger problem of the water inrush from the Ordovician limestone in the down group seam floor during the pressurized coal mining process in a mine of Poly Hesheng Coal Industry Company Limited,with the analysis on the geological condition and hydraulically condition of the seams in the mine,there were nine factors affected to the vulnerability evaluation of the water inrush from the Ordovician limestone in the down group seam floor determined and selected as the main control factors. GIS was applied to establish a subtopic figure layer after the classification treatment conducted on the data of the main control factors. Then the AHP method was applied to determine the weighting proportion of each main control factor and then a statistic analysis of the frequency histogram was conducted on the data. According to the relevant threshold value,the mine was divided into a water inrush safety area,quite safety area, transition area,quite vulnerable area and vulnerable area. The study results showed that in the scope of the mining area,the water inrush area from the Ordovician limestone in the combined seam floor of No. 10 seam and No. 11 seam would be a quite safety area from west to east,the transition area to the quite vulnerable area and the local structure area would be a water inrush vulnerable area.