Mine pressure behavior law of large mining height fully mechanized working faces
In the process of coal seam mining,due to the high technical level and complex mining conditions of thick coal seam mining,it is urgent to study the behavior law of mine pressure and various characteristics of thick coal seam working faces.Taking a typical large height working face of a coal mine in Shanxi as the engineering background,the load of each rock layer on the roof of the working face is theoretically calculated,and then the periodic collapse and initial collapse step distance of the roof are calculated.The calculated values can be used as a reference for practical practice.FLAC3D numerical simulation was used to analyze the behavior of mine pressure on the working face,and the conclusion is as follows:with the mining of coal seams,the roof rock layer gradually deforms and subsidence under the action of geo-stress,and the middle part of the roof has the largest amount of subsidence.The basic roof's initial pressure step distance is at about 60 m.Before the initial pressure,the stress peak value in front of the working face increases with the mining distance,and the affected ar-ea also gradually increases.When the advancing distance is 50 m,the influential range is about 35 m.As the mining dis-tance increases,when advancing to 60 m,the stress peak suddenly decreases,and the stress peak position gradually shifts deeper in front of the coal wall.At this time,the peak abutment pressure is about 15.1 MPa.
万方数据
维普
