Research On Comprehensive Water Prevention And Control Of Working Face In 22 Mining Area Of Zhaojiazhai Coal Mine

With the deepening of coal mining,more and more coal mines are facing the problem of coal mining under water.zhaojiazhai Coal Mine designed 22 mining area in the upper extension of the east wing in 12 mining area according to the development plan in order to ease the replacement of the working face.In order to liberate the coal under water,extend the service life of the mine,and ensure the safe mining of the mine.This article takes the coal seam mining in the 22 mining area of Zhaojiazhai Coal Mine as the research object,it is necessary to study the comprehensive water prevention and control technology for coal mining under the water body.and combines the characteristics of hydrogeological conditions of Zhaojiazhai Coal Mine with theoretical calculation analysis and numerical simulation analysis to study the comprehensive prevention and control of water in the 22mining area.1.According to the analysis of hydrogeological characteristics and aquifer groups The loose layers of the Quaternary and Neogene in the study area are divided into 4 sections,from top to bottom:the sectionⅠis the strong water-rich layer(group),the sectionⅡis the relatively weak water-rich layer(group),and the sectionⅢThe section is a relatively water-impermeable layer(group),and the section IV is a relatively weakly water-rich layer(group).2.An appropriate"two-zone"height calculation method was selected through a combination of empirical formula calculation comparison and CDEM numerical simulation analysis.Collapse zone height 9.61～64.32m,water-conducting fracture zone height3.Based on the thickness of the bedrock and the thickness of the protective layer,a sand control area,a waterproof area,and a safe mining area were demarcated in the study area.22 mining area has no anti-collapse zone,sand control area is 3972m~2,waterproof area is 563713m~2,and the other areas are safe and available.4.The water-rich evaluation results of loose strata of the Quaternary in the study area are medium to strong water-rich,which has no effect on coal mining.The water-rich evaluation results of loose strata of the Neogene are weak water-rich,which has a certain impact on coal mining.5.Aiming at the water damage of the loose aquifer,the Neogene bottom failure zone estimated static water reserves are 156597.20～221755.09m~3and the average water inrush from the working face is 255.27m~3/h.Analyzed the possibility of water inrush and sand break in working face,and joint drainage measures are proposed.6.The risk of water inrush from the floor is evaluated.According to the lithological characteristics of the floor of the study area and the water level elevation of each limestone aquifer,the water inrush risk zone is used to partition the water floor of the coal seam floor in the study area,and the floor drainage measures are proposed.