Study On Development Height Of Water Conducting Fracture Zone In Nearly Shallow Coal Seam

Yushenfu mining area is located at the junction of Shanxi,Shaanxi and Inner Mongolia.It is an important coal base in China.The mining area has the characteristics of large coal seam mining thickness,relatively shallow burial depth and fragile ecological environment.The large-scale development of coal resources will affect or destroy the aquifer and surface water system of overburden,and seriously threaten the fragile local ecological environment.Therefore,it is of great significance to study the development height of water conduction fracture zone in shallow seam for safe green mining,surface ecological environment and water resources protection in Yushenfu mining area.This paper takes Yushenfu mining area as the research object,and through field data collation and analysis,determines that the main factors affecting the development height of water conducting fracture zone in overburden are mining height,bedrock thickness,water and soil barrier thickness and location.Curvature deformation and horizontal deformation are the key parameters for calculating the development height of upward fracture and downward fracture depth.Based on the probability integral method,the curvature deformation and horizontal deformation of the continuous deformation zone of overburden in coal seam mioning evalure predicted by using the prediction and evaluation system of mining damage,which lays a foundation for theoretical analysis of the development height of the water conduction fracture zone of overburden.Through theoretical analysis and prediction results of overburden movement and deformation,the spatio-temporal evolution law of overburden water conduction fracture zone is studied,and the calculation method of development height of overburden water conduction fracture zone is given.Using FLAC3D numerical simulation software and taking Yushuwan Coal Mine as an example,the development height of water conduction fracture zone in overburden strata of Yushuwan Coal Mine is determined to be 89m.Through an engineering example,the development height of overlying water conducting fracture zone is calculated by using the method of calculating the development height of overlying water conducting fracture zone,and the development height of overlying water conducting fracture zone in Yushuwan Coal Mine is 90.56m.The results are basically consistent with the simulation experiment results and previous research results,which verifies the feasibility of calculating the development height of overlying water conducting fracture zone with curvature deformation and horizontal deformation as key predicted parameters.The research results provide a scientific basis for realizing water conservation mining in Yushenfu mining area and similar mining geological conditions,and have important theoretical significance for rational development and utilization of mining area,ecological environment and water resources protection.