Optimization Of Distribution Plan Of Mining-Dressing-Backfilling Integrated Working Faces In Deep Mine

The Xinjulong Coal Mine is a deep mine.A large number of rock lanes need to be excavated to meet the safety production needs of the mine so that a large amount of gangue is generated.The transportation of gangue not only increases the production cost of the mine,but also restricts the production capacity of the mine.In view of this,this paper takes the production succession of the Xinjulong Coal Mine and the requirements of in-situ filling of gangue as the research background,and uses field research,theoretical analysis and numerical simulation to study the principle of mining and distribution of the mining-dressing-backfilling integrated working face and the succession plan in Xinjulong coal mine;The source and output of the mine gangue are analyzed.Under the premise of ensuring the balance of the mine’s production and filling,the relevant parameters of the backfilling face are studied for different ground protection and filling requirements;FLAC^3D simulation software is used to simulate the displacement of key layer and the surface subsidence under different equivalent mining height conditions and analyze the economic benefits of the parameters under the premise of meeting the corresponding protection requirements to determine the equivalent mining height suitable for this mine.Finally,an intelligent decision support system for face mining is designed.The main conclusions are as follows:（1）The principle of mining and distribution of the mining-dressing-backfilling integrated working face is put forward.Based on this principle,three mining face distribution schemes were proposed,and the five aspects of production output prediction,service life,mining and driving sequence,underground transportation and ventilation and mining face moving were proposed.In terms of comparison and analysis of the matching mining plan,the first plan was obtained as a succession plan.（2）The annual output of mine gangue mainly comes from the mining face and the digging face,totaling 1.33¹.57 million tons.For the requirements of farmland protection and village protection requirements,taking 1303N-1 and 1307N backfilling face as an example,different filling rates were designed to obtain the corresponding propulsion speed.（3）The effect of surface subsidence and overburden displacement under different equivalent mining heights are analyzed using numerical simulation.The results show that with the equivalent mining height decreasing,the development range and height of the plastic zone gradually decrease,the influence range of the abutment pressure gradually decreases,the amount of ground subsidence gradually decreases,the surface deformation value gradually decreases.Combining the requirements of farmland protection for surface subsidence,the requirements of village protection for surface deformation and the profit of filling,it is determined that the equivalent mining height of the 1303N-1 working face is 0.64m and the propulsion speed is 9.0m/d;the equivalent mining height of the 1307N filling working face is 1.44m and the propulsion speed is 8.4m/d.At the same time,it is recommended that the equivalent mining height of the backfilling working face of the mine under farmland is 0.64m and the equivalent mining height of the backfilling working face of the mine under Zhanglou village is1.44m in the future.（4）Intelligent decision support system for working face matching and mining is developed,which realizes intelligent matching and mining of the mining-dressing-backfilling integrated working face.On the base of this,the advancing speed of filling working face is calculated.Taking the working face of the Xinjulong mine as the application background,the software is verified.The results are basically consistent with the above,which proves that the software is effective and can provide a reference for the matching and mining decision of similar coal mine face.