Control technology of roadway layout and anchoring efficiency enhancement under goaf
Based on the geological conditions of Huangyuchuan Coal Mine,aiming at the problem of poor stability of the mining roadway under the goaf when the coal seam group is mined down,the formula for calculating the maximum failure depth of the goaf floor after the upper coal mining was obtained by means of theoretical analysis and numerical simulation.In order to avoid the stress concentration area and the failure range of the goaf floor and rationally arrange the driving position of the lower coal roadway,four kinds of staggered dis-tance layout research schemes in the roadway were proposed.Numerical simulation method was used to study the distribution character-istics of the vertical stress in the area under the goaf and the variation characteristics of the plastic failure range of the surrounding rock under the four kinds of staggered distance layout.In view of the difficulty of roadway support,the optimization support scheme and the control technology of anchoring efficiency enhancement were proposed.The research shows that the stress concentration area caused by the remaining coal pillars of the upper coal seam seriously affects the stability of the roadway surrounding rock,and the staggered dis-tance of the roadway under the goaf is in the stress reduction zone when the distance is 4 times the width of the roadway.After adopting the optimized support scheme and anchoring efficiency control technology,the stress state of the surrounding rock in the roadway is good,the vertical stress gradually decreases,the plastic zone of the surrounding rock decreases,and the surface displacement of the roadway is effectively controlled.
under the goafstability of surrounding rocknumerical simulationstaggered layout in roadwayanchoring efficiency en-hancement control technology
万方数据
维普
