Research On The Optimization Of Coal Mining Based On Slope Stability In The Third Mining Area Of Shicaohe Open Pit Mine

The resource exploitation in the second mining area of Shicaohe open-pit coal mine ended and the stripping operation began to transition to the third mining area.The occurrence of coal seams in No.3 mining area is affected by complex geological structure.The number of coal seams in different regions of coal-bearing strata varies greatly,mostly between 1 and 6 layers.The regional difference of the thickness of coal-bearing strata is between 4.49 m and 19.35 m.Due to the influence of villages and ponds on the surface,the surface boundary of the third mining area of Shicaohe open-pit coal mine is extremely irregular,and the mining depth varies greatly in different areas,resulting in the large variation of the amount of soil discharge and the unbalanced release of the inner drainage space.Shicaohe open-pit coal mine is located in the mountainous area of Yunnan,and the outer dump is difficult to select and has a small capacity due to the influence of topography.Therefore,based on the analysis of geological conditions and slope stability,this paper makes an in-depth study on the optimization of the inner and outer dump in the third mining area of Shicaohe open-pit mine.The main research results are as follows:(1)Through into which river is open,the geological condition of coal mining,according to the situation of mine slope,determining three mining mining the help section and the analysis of earth slope,according to the stone runnel river mine end part of the current mining site and angles,calculated the 3/4 head head height,1/2 head height and 1/3height bottom of slope stability coefficient,In this paper,the slope stability coefficient of the dump is calculated under the conditions of 1/2 head height and 1/3 head height.Results show that the formation water for side slope and mine has a great influence on slope stability are,the lower the head height,the higher the stability coefficient,only under the1/3 height of head,three mining area during the mining site of side slope and slope stability coefficient is greater than 1.2,and so on in accordance with the stone runnel river mine current slope Angle in mining process,the three mining lose drainage measures should be strengthened,Reduce the catchment into the pit,the basement for internal drainage before the bottom need to do a good job of silt prevention treatment.(2)Through stone caohe open-pit mine geological data and the measured stope site,related data,such as the status quo,into which the river open-pit mine 3 d entity of geological model is established,the error rate is 3.81%,meet the requirements of accuracy,put forward the maximum level,reduce scope of west mining areas and reduce and avoid the pool three three schemes for delineating mining realm,established the model of solution mining,Calculate the corresponding mining and stripping quantities and analyze them according to the engineering characteristics of each scheme.The results show that scheme 1,namely the maximum boundary scheme,is the best scheme,with more mining resources and the maximum profit,up to 552.5 million yuan.Based on the slope stability Angle of the dump slope,the dump capacity of six stages during the mining of the third mining area is verified.Optimized calculation of six stages of mining and stripping engineering quantities and the amount of dumping.Based on the determination of the mining boundary and mining mode of the third mining area,the main project of mining area continuity is defined,and the open ditch scheme is recommended to carry out the project of transforming the Shicaohe River into a river,which ensures the normal mining activities of the Shicaohe Mine during the succession period of the third mining area,and has certain reference significance for the connection of the open-pit mine with similar geological conditions.