红砖煤矿主采煤层顶底板突水危险性分析

!Xuzhou 221116,ChinaAnalysis on Roof and Floor Water Inrush Hazard in Main Mining Seam in Hongzhuan Coal Mine

根据红砖煤矿水文地质条件,推测井田内长兴组为中等岩溶含水层,茅口组为强含水层。采用顶板垮落带与导水断裂带高度计算法,分析了开采C1煤层时顶板突水危险性,同时采用底板安全隔水层厚度及突水系数法,分析了开采C10煤层时底板突水危险性。结果表明,在井田范围内C1煤层采掘作业时,顶板长兴组含水层对C1煤层有突水威胁;开采C10煤层时,由于受底板峨眉山玄武岩的隔水作用,在正常地段各煤层+800 m标高以上带压采掘作业茅口组强含水层对矿井没有突水威胁。另外,由于矿区范围内F3、F4、F8断层作用,上盘各煤层与茅口组地层间距拉近,导致在断层附近各煤层采掘作业时有突水危险。

It was inferred that the Changxing formation within the coal field was the medium karst aquifer and the Maokou formation was the strong karst aquifer according to the hydro-geological conditions of Hongzhuan Coal Mine. The roof water inrush hazard of C1 seam was analyzed by using the calculation method of the height of the roof caving zone and water-flowing fractured zone, and the floor water inrush hazard of C10 seam was analyzed by using the safe water-resisting layer thickness in the floor and the water inrush coefficient method. The results showed that when C1 seam within the coal field was extracted, the aquifer in roof Changxing formation posed water inrush threat to this seam;when C10 seam was extracted, the strong aquifer in Maokou formation did not pose water inrush threat to this seam in the normal area with the coal seam elevation of above ＋800 m due to the water-resisting action of Emei Mountain basalt in the floor. In addition, each coal seam on the upper side was closer to the Maokou formation due to the action of F3 , F4 and F8 within the mining area, this may lead to the water inrush hazard when the coal seam near the fault was extracted.