宝塔山砂岩含水层水文地质特征及突水危险性研究

Study on hydrogeological characteristics and water inrush risk of Baotashan sandstone aquifer

新上海一号煤矿中下组煤炭资源的开发受到侏罗系宝塔山砂岩突水的威胁。在对宝塔山砂岩进行水文地质补勘工程、井下放水试验的基础上,初步认识宝塔山砂岩含水层赋存条件、富水性特征、含水层水动力参数等水文地质特征。结合突水系数法对16、18煤开采底板宝塔山砂岩含水层突水危险性进行了分析。结果表明,16煤开采,井田绝大部分区域为安全区域,危险区域主要分布于井田的东部及东南区域范围内;18煤底板宝塔山砂岩水突水系数为0.0441~0.2227 MPa/m,平均0.0945 MPa/m。井田西北部存在突水系数小于0.06 MPa/m的区域;井田北部和中部大部分范围内突水系数为0.06 MPa/m<T≤0.1 MPa/m;井田中部、东部及南部地段突水系数大于0.1 MPa/m。通过对16、18煤开采底板宝塔山砂岩突水危险性分区,为16、18煤的安全开采提供依据。

Theexploitation of coal resources in the middle and lower formation of Xinshanghai No.1 Coal Mine is threatened by water inrush from Jurassic Baotashan sandstone.Based on the hydrogeological supplementary exploration project and underground water release test of Baotashan sandstone,the hydrogeological characteristics of Baotashan sandstone aquifer,such as occurrence conditions,water yield characteristics and hydrodynamic parameters,are preliminarily understood.Combined with the water inrush coefficient method,the water inrush risk of Baotashan sandstone aquifer in 16 and 18 coal mining floor was analyzed.The results showed that most areas of 16 coal mining are safe areas,and the dangerous areas are mainly distributed in the east and southeast of the mine.The water inrush coefficient of Baotashan sandstone in 18 coal seam floor ranges from 0.0441 to 0.2227 MPa/m,with an average of 0.0945 MPa/m.The water inrush coefficient is less than 0.06 MPa/m in the northwest of the mine field.The coefficient of water inrush is between 0.06 MPa/m<T≤0.1 MPa/m in most parts of the north and middle of the mine field.The water inrush coefficient in the middle,east and south sections of the mine field is greater than 0.1 MPa/m.Through the division of water inrush risk of Baotashan sandstone in 16 and 18 coal mining floor,the basis for the safe mining of 16 and 18 coal is provided.