Research on evolution law characteristics of overlying rock collapse in goaf
The study on evolution law characteristics of overlying rock in mine goaf plays an important role in ensuring safe and efficient production of coal mine.Based on the field measurement of fully-mechanized goaf,this paper used PFC particle flow numerical simula-tion software to numerically simulate the actual situation of the coal mining face on-site.Through the numerical simulation of PFC3D soft-ware,the positions at different heights of strata were selected as the measurement reference positions,and the collapse law and porosity structure of coal seam,direct roof,rock layer and key layer during the mining process of No.204 working face in Gaojiapu Coal Mine were analyzed.The analysis results showed that the collapse degree of overlying rock was positively correlated with the stoping distance of working face.When the stoping distance reached 70 m,the collapse process basically ended.At this time,the collapse height of over-lying rock was 26.15 m,and the porosity was stable at about 0.42,which was 3.5 times of that before mining.The simulation results provide a theoretical basis for disaster prevention in goaf of Gaojiapu Coal Mine.
numerical simulationgoafoverlying rock characteristicstube monitoring
万方数据
维普
