12.Research on the development law and fractal evolution characteristicsof overburden rock fissures in coal seam group mining

Abstract:

China＇s Shenfu Dongsheng Coal Field is rich in coal resources and is endowed with a large number of proximal coal seamgroups. The fissures created by the mining of coal seam clusters are highly susceptible to penetrating to the surface causing subsidenceand soil erosion. In order to grasp the development law of overburden fissure of coal seam group mining,the research was carried outthrough the combination of physical similarity simulation experiments and fractal dimension calculations with the background of miningof 12 Upper Coal Seam and 12 Coal Seam in Haragou Coal Mine. The overlying rock fracture development law under the influence ofrepetitive mining was revealed,and the fractal dimension evolution segments of rock fracture under the influence of repetitive miningwere proposed:single coal seam fractal dimension slow ascending section,single coal seam fractal dimension fast ascending section,fractal dimension stabilizing section,and repetitive mining second ascending dimension stage.

Keywords: coalbed group mining;repeated mining;overburden fractures;fractal dimension