| Water-filled in mineral deposit is one of the common problems in mining engineering, in mine construction and production process, the mine water and increase the cost of the mine drainage, due to the complexity of some mine in water conditions, water-based filling, and has found an impact that can not be carried out the exploitation of mineral resources as soon as possible. For the production of the mine, as mine water, the light impact of the extraction efficiency, the heavy impact of the flooding caused mining area, mine forcing a halt of production, particularly in karst areas.Chongqing Yutianbao coal mine,is affiliated the bureau of Nantong coal mining,in the central of Nantong coal field,which located in Wuli Village in Wandong city,the south of Wansheng District of Chongqing.The coal field,the east-west direction in general,the east of it adjacent to Donglin coal mine,bounded by V lines of exploration,the west of it neighbored Nantong Coal Mine,Liu jia River as the border.Has been put into operation since 1958,with the deep extension of the exploitation, and the mining area in accordance with the conventional water balance calculation, the mine can not balance the discharge of the mine appeared "leapfrog" in tremendous growth,the issue of water damage more obvious day by day,even causes the Chongqing Yutianbao coal mine as one of the most serious water disaster issues in south of China.The Chongqing Yutianbao coal mine present 3 water levels:+150m water level of the average water volume is 75m3/h,about 30% of the total amount of water volume;-100m water level of the average water volume is 145m3/h,20% of the total water;-350m water level of the average water volume is 438m3/h,accounting for almost 50% of the total amount of water.In view of complex hydrogeological conditions in coal field in Chongqing yutianbao, with the increase of mining depth,the current status of mine water growth in "leapfrog", and the mining area in accordance with the conventional water balance calculation, mine water can not balance, combined with the project of discharge-saving and ejection-decreasing in Chongqing Yutianbao coal mine in 2008, under the guidance of instructor,in the title of"Analysis of water conditions and management program in Chongqing Yutianbao coal mine",through a large number of information on the physical geography of the region and the hydro-geological conditions of literature,on-site research in surface and underground, from the special hydrogeological conditions in the area of Chongqing Yutianbao coal mine,analysis the conditions in water-filled mineral deposit according to the special local geological environment,focus on "three zones" (that is caving zone, hydraulic conductivity fracture zone, the overall mobile zone) , where water-filled channel impacted on the Strength of water-filled mine.Using two-dimensional discrete element (2D_Block software) of numerical simulation software to establish a mining model of the +150m,-100m,-350m levels,simulat the characteristics of destruction of the coal seam with an increase in the exploitation depth,determine the maximum height of overlying strata fracture zone,caving roof in various exploitation level,in order to identify the development status of crack in the various levels of water extraction.Thus, find out water-filled channel to determine the filled-water in various level, establish the water-filled mine hydrogeological conceptual model in coal mining conditions. Ultimately, propose the project of discharge-saving and ejection-decreasing in Chongqing Yutianbao coal mine reasonably (including the ground closure, underground mine closure and borehole sealing),to reduce the cost of the mine drainage and increase the economic efficiency,it is extremely vital significance to the development of the mine enterprise's economic in future. |
