Relationship between water inrush from coal seam floors and main roof weighting  

作　　者：Sun Jian Hu Yang Zhao Guangming 

机构地区：[1]School of Energy and Safety,Anhui University of Science & Technology [2]State Key Laboratory of Coal Resources and Safe Mining,China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》2017年第5期873-881,共9页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51404013 and 51674008);the Open Projects of State Key Laboratory of Coal Resources and Safe Mining at the China University of Mining and Technology (No. 13KF01);the Natural Science Foundation of Anhui Province (Nos. 1508085ME77 and 1508085QE89)

摘　　要：A water-resistant key strata model of a goaf floor prior to main roof weighting was developed to explore the relationship between water inrush from the floor and main roof weighting. The stress distribution,broken characteristics, and the risk area for water inrush of the water-resistant key strata were analysed using elastic thin plate theory. The formula of the maximum water pressure tolerated by the waterresistant key strata was deduced. The effects of the caved load of the goaf, the goaf size prior to main roof weighting, the advancing distance of the workface or weighting step, and the thickness of the waterresistant key strata on the breaking and instability of the water-resistant key strata were analysed.The results indicate that the water inrush from the floor can be predicted and prevented by controlling the initial or periodic weighting step with measures such as artificial forced caving, thus achieving safe mining conditions above confined aquifers. The findings provide an important theoretical basis for determining water inrush from the floor when mining above confined aquifers.A water-resistant key strata model of a goaf floor prior to main roof weighting was developed to explore the relationship between water inrush from the floor and main roof weighting. The stress distribution,broken characteristics, and the risk area for water inrush of the water-resistant key strata were analysed using elastic thin plate theory. The formula of the maximum water pressure tolerated by the waterresistant key strata was deduced. The effects of the caved load of the goaf, the goaf size prior to main roof weighting, the advancing distance of the workface or weighting step, and the thickness of the waterresistant key strata on the breaking and instability of the water-resistant key strata were analysed.The results indicate that the water inrush from the floor can be predicted and prevented by controlling the initial or periodic weighting step with measures such as artificial forced caving, thus achieving safe mining conditions above confined aquifers. The findings provide an important theoretical basis for determining water inrush from the floor when mining above confined aquifers.

关 键 词：FLOOR WATER inrush Main ROOF weighting Water-resistant key STRATA FORCED CAVING 

分 类 号：TD745[矿业工程—矿井通风与安全]