上覆采空区积水煤层开采突水危险性研究  

Study on water inrush risk of coal seam with accumulated water in overlying goaf

作　　者：陈超 CHEN Chao(Shanxi Tiandi Wangpo Coal Industry Co.,Ltd.,Jincheng,Shanxi 048021,China)

机构地区：[1]山西天地王坡煤业有限公司,山西省晋城市048021

出　　处：《中国煤炭》2021年第10期31-37,共7页China Coal

基　　金：中煤科工能源科技发展有限公司项目资助(2020QN01)。

摘　　要：为了摸清王坡煤矿15号煤层开采是否受上覆3号煤层采空区积水威胁,理论分析了3号煤层与15号煤层之间主关键层的位置、基采比、关键层破断裂隙贯通的临界高度等参数,预测原始条件下开采15号煤层覆岩导水裂缝带高度为69.13 m;采用经验公式,计算得出原始条件下开采15号煤层覆岩导水裂缝带高度为64.82~86.76 m。采用双端堵水器试验法实测了3号煤层采动影响底板破坏深度为20.39 m;采用经验公式计算得出3号煤层采动影响底板破坏深度为19.44 m。由于3号煤层与15号煤层之间平均间距为88.02 m,且大采高和放顶煤开采的垮落带和导水裂缝带高度要比分层开采高,经综合分析得出,开采15号煤层将面临上覆3号煤层采空区积水威胁,开采前需对上覆3号煤层采空区积水进行疏放。In order to find out whether the mining of No.15 coal seam in Wangpo Coal Mine was threatened by the goaf water of No.3 coal seam,the parameters such as the position of the main key layer between No.3 coal seam and No.15 coal seam,the ratio of base thickness to mining thickness and the critical height of the fracture penetration of the key layer were theoretically analyzed,and it was predicted that the height of water conducting fracture zone in the overlying rock of No.15 coal seam under the original conditions was 69.13 m,while it was calculated as 64.82~86.76 m by empirical formula.The floor failure depth under the influence of No.3 coal seam mining was measured as 20.39 m by double-end water shutoff test method,while it was calculated as 19.44 m by empirical formula.As the average distance between No.3 coal seam and No.15 coal seam was 88.02 m,and the height of caving zone and water conducting fracture zone during large mining height mining or top-coal caving mining was higher than that during layered mining,so it was concluded through comprehensive analysis that the mining of No.15 coal seam would face the threat of goaf water of overlying No.3 coal seam,it was necessary to drain the goaf water before mining of No.15 coal seam.

关 键 词：上覆采空区 采空区积水 主关键层 导水裂缝带 底板破坏深度 

分 类 号：TD745.21[矿业工程—矿井通风与安全]