| China's national economic development has a high demand for coal resources.However,the hydrogeological conditions and water-filling conditions of coal mines in China are complex and diverse,and the threat of various water damages caused by coal mines in production is very serious.Mine water damage accidents occur frequently and have become one of the major hazards affecting mine safety production.In recent years,with the application of coal mine comprehensive mechanized coal mining technology,as well as the mining depth,mining scale and mining intensity,the problem of water damage in coal seam roof has become more and more serious.Since Xuzhuang Coal Mine was put into operation,there have been many large roof water inrush accidents during the coal seam mining process.The frequency of the roof sandstone water bursting was high,and the volume of water-bursting was large.The safe production of mines poses a certain threat.Therefore,it is very necessary and urgent to carry out research on prevention and control of roof water damage.Based on the collection and analysis of mine geological and hydrogeological data,this paper collected and analyzed the geology and hydrogeological data of the Xuzhuang Coal Mine.It collected and analyzed all the water inrush from the roof of the mine and summarized the characteristics of water bursting from the 7 coal seam roof.The hydrological and engineering geological characteristics of 7 coal seam roof sandstone and its overlying Boundary sandstone aquifer,J-K bottom conglomerate aquifer and Quaternary bottom aquifer were systematically analyzed.Based on the theory of multi-information fusion,the evaluation model of water-rich index of each aquifer was established.The water-enrichment of the 7 coal seam roof sandstone aquifer,the Boundary sandstone aquifer and the J-K bottom conglomerate aquifer was evaluated.And the unit water inflow q was used to evaluate the water-richness of the Quaternary aquifer in the study area.Based on the above research,the risk of water bursting from the 7 coal seam roof in the II(3)downhill mining area to be mined was predicted by the “three map method”,which provides a hydrogeological basis for the prevention and control of coal seam roof water damage in the II(3)downhill mining area.The main achievements are:1.The characteristics of the 7 coal seam roof water bursting were summarized.The main characteristics are as follows:the occurrence of 7 coal seam roof water bursting was closely related to the fault structure;the overlying aquifers had water source replenishment effect on the 7 coal seam roof sandstone aquifer,and the change of the volume of 7 coal seam roof water bursting was affected by the recharge of the overburden aquifers;the frequency of water bursting and the amount of the water-bursting of the 7 coal seam roof were related to the level of mining.It was about600 m in shallow that the water-bursting inflows increased with depth,and it was about600 m in depth that the water-bursting inflows decreased with depth.2.The hydrological and engineering geological characteristics of each aquifer were evaluated based on the lithology,thickness,rock strength,the drilling core recovery rate,drilling fluid consumption,pumping test results and the water bursting conditions of each aquifer.3.The main controlling factors affecting the water-richness of each aquifer were selected.The subjective weight,objective weight and comprehensive weight of each main controlling factor were determined by AHP method,independent weight coefficient method and multiplicative synthetic normalization method.And the water-rich index method evaluation model based on AHP and independent weight coefficient method was established by ArcGIS.Based on this,the water-richness of the7 coal seam roof sandstone aquifer,the Boundary sandstone aquifer and the J-K bottom conglomerate aquifer was evaluated and partitioned.4.Based on the analysis of mine hydrology and engineering geological characteristics and the evaluation of the water-rich partition of each aquifer,it was determined that the water-filled sources of the 7 coal seam roof in the II(3)downhill mining area are the 7 coal seam roof sandstone aquifer and the Boundary sandstone aquifer.Using the "three map method" to predict the risk of water bursting from the 7coal seam roof in the II(3)downhill mining area,and delineated the target area of the 7coal seam roof bursting water control and prevention during the mining process.And the normal and maximum water inflow of the working face of the mining area was expected by using analogy method,which provides a scientific basis for the design of the prevention and control water project in the mining area.Figure [51] Table [46] Reference [128]... |
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