Study On Comprehensive Evaluation Of Water Inrush Hazard And Water Control Technology Of No.1 Coal Roof In Xinjiang Ehuobulake Coalmine

Many water inrush accidents in the process of mining have broken out in The Ehuobulake Coalmine due to the loose aquifer of ancient gully on the surface There was a water inrush accident of 1335m³/h when the mineing activities advanced to1100m of lower-1#coal seam in the 1106 mining panel.It can be seen that the complex hydrogeological conditions of lower-1#coal seam roof in the mine have brought major hidden dangers of water inrush to mining safety.In this thesis,a systematic study is carried out on the key issues,such as strong water-rich and complex hydrogeological conditions of the loose aquifer in the ancient gully of the roof in the coal mining process of The Ehuobulake Coalmine.The research content mainly includes:（1）The statistics of water-rich abnormal area and related hydrogeological parameters of the main water-filled aquifer in the roof of lower-1#coal seam have been explored and obtained.Through the systematic study on the recharge,runoff and discharge conditions of groundwater in the area,the hydraulic relationship between each main water-filled aquifers are obtained,and the main water-filled aquifer of lower-1#coal seam is determined to be the quaternary loose aquifer（the water-rich section of ancient Chuanggou）and the aquifer of J₁a Formation.Through targeted geophysical exploration and drilling exploration,the water-rich abnormal areas of the main water-filled aquifer in the roof are identified,especially the distribution range,water-rich regularity and related hydrogeological parameters.（2）Comprehensive evaluation and zoning of the roof water-rich degree,height development degree and water inrush risk were carried out.Based on the GRA-AHP comprehensive weight analysis method,the weight ratio of each factor control degree is determined,and the comprehensive partition evaluation is carried out on the water-rich degree of roof water-filled aquifer of lower-1#coal seam.The prediction and zoning of the development height of roof water-induced fissure zone in lower-1#coal seam in the study area are carried out by using the empirical formula and the measured fissure ratio formula.The zoning standard of water inrush risk in the roof of lower-1#coal seam is put forward,and the comprehensive evaluation and zoning of water inrush risk in the roof of lower-1#coal seam is carried out by using double graph superposition method.（3）Design and implement the comprehensive prevention and control technology of water damage in the ancient gully roof of the study area:design the comprehensive prevention and control technology scheme of surface"curtain wall-drainage channel"and underground"discharge lane-drainage hole"for water damage in the ancient gully roof;Through the on-site implementation of the above scheme,the flow interception effect is remarkable,and the water inflow in 1106 mining panel is reduced by about84%,and the water inflow in the upper section of Xinda well is reduced by about 74%.The total discharge of drainage roadway is basically stable at about 500m³/h,and the normal mine inflow is basically stable at about 530m³/h.The research results of this thesis provide ideas for the exploration,evaluation and comprehensive prevention of water damage in the runoff supply area of snowmelt water in front of Xinjiang Tianshan Mountain,especially in the buried ancient gully rich water runoff zone,and it can provide reference and basis for the treatment of water damage in other adjacent mines.This thesis has 66 pictures,31 tables,70references.