Analysis On Surrounding Rock Structure Characteristics And Roadway Layout Of Fully-Mechanized Mining In Lower Slice Face

Based on the geological characteristics of group A coal engineering of east mining area of Pansidong Mine.Combining with the mining pressure of top slice working faces and occurrence characteristics of A1&A3 coal,statistical analyzed characteristic of strata behaviors of three long-wall panels,namely No.11113,No.11213 and No.11313.Component the model of east mining area by FLAC3D numerical simulation software to study section coal pillar influence of stress concentration,stress distribution law of overlying strata,plastic failure fields of surrounding rock in mining district,combined with theoretical analysis,propose roadway layout plan of lower layered face No.11111.Determined internal misaligned arrangement 14m for conveyor roadway and 15m for the cut-hole,entry outward staggered arrangement 55m for ventilation entry.This roadway layout plan is helpful to avoid the area of stress concentration and increase coal recovery rate.Aiming at obtain strata-pressure behavior of lower layered face No.11111,designed scheme of the mineral pressure observation.According to the observation results and different conditions of roadway surrounding rock,obtained deformation laws of roadway surrounding rock from measurement.The results show that surrounding rock structure showed severe damage in mining gateway under entity coal roadway.Finally,based on theoretical analysis and calculation results of engineering geological conditions,the roadway layout plan of lower layered face No.11311 and No.11211 was proposed.