Study On Water Flowing Fracture And Surface Subsidence Law Of Fully-mechanized Caving Mining In Baode

With the introduction of the concept of green mining of coal,China pays more and more attention to the protection of ecological environment and water resources,but the high-intensity mining method adopted by coal mines has serious damage to water resources and surface ecological environment,and the theory and technology related to water resources protection and surface ecological protection still have short boards,which need to be studied in depth.Based on the mining conditions of Baode coal mine,this paper uses theoretical analysis,on-site measurement and numerical simulation to study the evolution characteristics of water-guided cracks and the law of surface subsidence in view of the development height and surface subsidence in the process of mining.Using the method of estimating the development height of the water-conducting crack zone based on the key layer position,the height of the water-conducting crack zone on the 81306 work surface of Baode coal mine is estimated,and the estimated result is 84 to 151.9m,which is basically in line with the measured results of 106 m at the scene,and the influence of the wide,high and deep water-splitting factors on the development characteristics of the water-splitting gap is analyzed.It is measured that the maximum sinking amount of the surface of the 81306 surface of the Baode mine is 3158 mm,the subsidence coefficient is 0.53,the crack angle is 83 degrees,the moving angle is 78 degrees,the boundary angle is 68 degrees,the range of influence of the surface subsidence is large and the surface ditch valley has been landslided many times.Based on this,the influence of the depth,slope angle and mining boundary on surface subsidence was studied,and it was found that the greater the depth and slope of the ravine valley,the greater the degree and range of surface movement deformation,and the largest subsidence of the surface when the mining boundary was below the top of the ravine slope.The study determined the impact range of 81304-81306 work surface mining and the protection range of coal columns in ground buildings.The results provide reference for water resources protection under similar conditions and coal mining under building.This paper contains 58 figures,13 tables and 136 references.