大远煤业煤层底板奥灰突水危险性评价

The inrush risk assessment of Ordovician limestone water in the coal seam floor in Dayuan coal mine

煤层底板奥灰岩溶裂隙水是山西大远煤业有限公司主要水害类型之一,本文以大远煤业现主采煤层2#为例,结合井田钻孔资料分析了2#煤底板奥灰水压、奥灰水位、奥灰顶部相对隔水层厚度等因素。计算了突水系数,绘制底板承受的奥灰水压等值线图、隔水层厚度等值线图、奥灰含水层突水系数等值线图。用突水系数方法评价矿井突水危险性,并划分了井田带压开采安全区、相对安全区、相对危险区和危险区危险性分区。根据分区、突水危险性等具体条件,提出防治水建议。

The karst water of Ordovician limestone in the coal seam floor is one of the main type of water dam- age in Dayuan Coal Industry Co. Ltd. in Shanxi province. The primary mineable coal bed 2＂ coal is taken as an example. The Ordovician limestone water pressure, Ordovician limestone water level, the relative imperme- able layer thickness over Ordovician limestone and other factors are analyzed combined with drilling data in well field. We calculated the water bursting coefficient, drew the contour map of floor to Ordovician limestone water pressure to the coal floor, the contour map of impermeable layer thickness and the contour map of water bursting coefficient in Ordovician limestone aquifer water. The mine water bursting risk has been evaluated by using the method of water bursting coefficient. Finally, we divided the mining area into safety zone under high pressure, the relatively safe area, the relatively risking area. According to the specific conditions of the partition and water bursting risk, the prevention and control of water hazard has been suggested.