Feasibility Analysis And Technical Scheme Study On Land Loss Mining In Baoli Open-pit Coal Mine

The paper takes Baoli open-pit coal mine as the research object.Firstly,it analyzes the geological data of the existing eastern end of Baoli Mine,selects the representative profile of the end-end,analyzes the stability of the two-dimensional slope,and finds its ultimate stability.The angle of the slope corresponding to the state,with this angle as its maximum steep mining angle.Based on the angle of the largest steep shovel,the inner lining is carried out at the foot of the end shovel,and the relationship between the inner sluice height and the stability of the end slop is statistically analyzed,and the stability of the opposite end is also analyzed.Positive effects.Based on the above parameters,the design of the steep mining plan for the eastern end of Baoli Open-pit Coal Mine is designed,and the economic benefits of the mining area are finally calculated.Through the selection of the limit equilibrium method and FLAC3 D,the stability study of the eastern side of the slope is used to help the steep mining,and the whole eastern end is simulated in three dimensions.The stability of the results is good.After the mining,the whole The slope stability is above 1.2,which meets the requirements;after a series of analysis,the maximum steep angle is 49°,which is 13° higher than the initial setting;since the service life of the eastern end is less than 1 year,it is stable during the steep process.The sex is always above 1.1,which satisfies the stability requirements of short-term non-work gangs;the stability analysis of the eastern end slope after the internal pressure relief is obtained,and the stability coefficient can be increased to 1.2 or more;The transportation system optimization scheme of the type of dumping can save the transportation distance by 285 m and save shipping costs of 345,500 yuan;In the process of steep gangs,the angle of the eastern end slope is increased from 36° to 49°.After calculation,the “stagnation coal” can be recovered more than 63,100 tons,and the economic value can be created in the near future of 8.99 million yuan.The Dongbang steep-cut mining plan of Baoli Open-pit Coal Mine is not only applicable to the eastern gang of the mining area,but also applicable to the end gangs of other mining areas,providing valuable experience and technical support for the subsequent help of steep mining,with the promotion value and significance.