Research On Characteristics Of Water Gushing And Mining Technology In Xiaojihan Coal Mine

With large-scale mining,the Xiaojihan coal mine revealed that the No.2 coal seam is a special coal seam and is the main aquifer of the mine.Due to various reasons,the hydrogeological data of the mine has certain deviations from the actual conditions of the site.The specific details of the water inrush characteristics of the mine are unknown.The law of the diameter of the mine water is irregularly changed with the coal mining,and the water for the mine is controlled.Work brings some difficulties.In this paper,the research methods and technical methods such as drilling,transient electromagnetic exploration,drilling simple hydrological observations and numerical simulation are used to study the water inrush characteristics of Xiaojihan coal mine.The key points of mine prevention and control water in 11 mining areas are determined.A practical mine water prevention and control program in the South and North Wing.The main research results are as follows:(1)Under natural conditions,coal seams and sandstone fissure water are recharged from the forty-five mile beams and shallow layers in the west,from the west to the east for reverse propensity flow,excreted in the shallow outcrop;after the mine is mined,the shallow funnel is formed.The outcrop is backflowed,and the mine gets more water from the original discharge area.(2)Height of the water-conducting fracture zone was determined through the use of empirical calculations,various numerical simulations,drilling and hydrological simple observation techniques,revealing the development of water-conducting fissures on the No.2 coal overlying bedrock in Xiaojihan coal mine.The characteristics of mine water inrush was determined,and finally the sandstone fissure aquifer involved in the normal water inrush of the mine limited to the top of the Yan'an Formation and the Zhiluo Formation was acknowledged.Even if the stability group is included,the water-rich and permeability of each layer are weak.(3)Characteristics of mine gushing water were determined,the amount of mine gushing water was reasonably predicted.The specific hydrogeological conditions,the focus and technology of the mine water prevention in the 11 mining areas were fixed.(4)Based on the mine water prevention and control,the mining technology and system were optimized.The paper concludes 49 figures,10 tables and 82 references;...