Analysis of optimum filling rate for filling mining in Guojiatan Coal Mine based on numerical simulation
In order to alleviate the contradiction between water resources protection and high-intensity coal mining,taking the 20102 working face of Guojiatan Coal Mine as the research background and using numerical simulation as the main re-search method,we expound the basic mechanism of controlling overlying strata movement by solid filling mining,analyze the height development law of overlying strata water-conducting fracture zone and the characteristics of overlying strata move-ment and deformation under different filling rates,and give the reasonable filling rate of solid filling mining under aquifer.The results show that with the increase of filling rate,the movement intensity of overlying strata weakens,the development height of water-conducting fracture zone decreases,the deformation of overlying strata decreases greatly,and the ratio of sur-face subsidence to basic roof subsidence decreases gradually.When the filling rate is 0％,20％,40％,60％and 80％,the height of water-conducting fracture zone is 125.6 m,102.3 m,76.5 m,48.6 m and 22.5 m,respectively.The maximum horizontal deformation of topsoil is 5.19 mm/m,4.06mm/m,2.81 mm/m,1.72 mm/m and 0.92 mm/m,respectively.The reasonable filling rate of the water-conducting fracture zone that does not run through to the aquifer of Zhiluo Formation is a-bove 60％,and the reasonable filling rate of the surface soil layer without failure is above 60％.Finally,the reasonable fill-ing rate of the 20102 working face is determined to be 60％.
solid fillingwater conservation miningstrata movementwater-conducting fracture zone
万方数据
维普
