Analysis On The Variation Characteristics And Sources Of Mine Waterinflow In 301 Plate Area Of Hang Lai Bay Coal Mine

Taking Hang Lai Bay coal Mine in Yulin,Shaanxi Province as the research object,this paper analyzes and studies the source and variation law of.mine water inrush in Hang Lai Bay coal mine on the basis of mastering the hydrological observation data of Hang Lai Bay coal mine since it was put into production,combining the hydrogeological cond:itions,mining mode and production status of mine,using downhole observation,ground survey and so on.The main water source and water recharge channel of the mine are determined,and the relevant suggestions are put forward for the mining of two plate area and lower stratification en the later stage of mine.The main research results are stummarized as follows:(1)through the empirical formula,drilling measurement,peripheral coal mine analogy,transient electromagnetic detection and other methods,to determine the 3te disk area stratified mining thickness of-4.8m,the Water guide firacture zone height of 120.8m,fracturing ratio of 25.e6tAt the same time,it is found that the empirical formula is not applicable to the calculation of the height of the Water guide fracture zone under the condition of large mining and higlh mining in thick coal seam in Hang Lai Bay,(2)Hang Lai Bay coal mine through str4atified high-limit mining,the Water guide fracture zone is controlled in a reasonable interval,after the recovery of the working face in the goal water level has been significantly reduced,mining after half a year,the goaf dive position gradually stable,thus,the stratified high-limit mining has not caused a large number of ground,water loss in goal.(3)The increase of rainfall during the rainy season has not resulted in a significant increase in the amount of water gushing in the mine,and the storage and lag distribution of rainfall by the loose layer with large cladding thickness in goaf has not only realized the uniform distribution of rainfall,but also maintained the relative stability of tlhe groundwater level in goal.(4)The change characteristics of mine water inrush since the mine was put into production are divided into growth period and stable period,30101 working face-30104 working face recovery period,the mine water inrush from 260m3/h to 1032m3/h,this period mine main water inrush from the goaf upper bedrock fracture pressurized water,The vertical infiltration of submersible and surface artificial water bodies in the Quaternary Sarawusu group,as well as the lateral recharge of the Quaternary loose layer submersible and the pressurized water of the bedrock fracture;During the recovery of 30105 working face-30107 face,the water inrush fluctuates up and down in the 1000m3/h range,and no longer increases with the increase of the mining range,During this period,the main water inrush of the mine came from the vertical infiltration of the upper Quaternary Sarawusu group in the 30101-30104 goaf,as well as the lateral recharge of the Quaternary loose layer diving and the pressurized water of the bedrock fissure.