Study Of End-slope Coal Mining On The Slope Stability In The Heidaigou Open Fit Coal Mine

Affected by Huang Jialiang anticline,under the western slope Heidaigou open pit mine coal seam burial depth increase,on unreasonable economic open pit mine is unreasonable economic.Coal under the western slope is between 135m ? 350m,west Slope Coal length of about 6000m,about 45 million tons of coal.In order to improve resource recovery,It plans to use underground mining to recover slope coal resource.Heidaigou coal mine west slope is small and norrow,from the surface it does not have the conditions of the industrial square arrangement,in the end the exploitation of the first mining area in the southwest corner reserved a non-backfill pit mining industry as to the square,from mine coal seam outcrop impose adit form into the seam,pit for an arrangement of the necessary production facilities.Adit-pit slope coal resource recovery is not been study in the world before.Firstly,study on untapped slope stability,then determine underground mining program.Study the underground mining coal pillar width,to ensure the safety of the roadway under the slope.Analysis of the influence of well drilling on the stability of the pit slope.Study on the safety of the production facilities in the pit.The problem of slope stability in Heidaigou pit is three-dimensional problem,two dimensional slope stability research method is not applicable.The paper mainly uses the FLAC3D simulation research.Use FLAC3D to set up the Heidaigou pit model.The basic parameters of the simulation are obtained through the experiment of mechanics and the field investigation.By numerical simulation of Heidaigou pit slope stability coefficient is 1.20.Analysis of Heidaigou mining wellhead location selection,mining method Selection.Determined from the West help develop adit into the plan of coal,design of surrounding roadway layout.Using FLAC3D to analyze the protective effect of coal pillar under different roadway protection,determination of reasonable coal pillar width.improve roadway layout.the law of failure and displacement of the pit slope is analyzed.Pit of south slope upper step landslide occur under influence of mining.Leaving an impact on safety at the bottom of the pit,need to leave the pit slope to take certain control measures.