Research On Fracture Distribution And Rainfall Infiltration Regularity Of Shallow Steeply Inclined Coal Seam Group

Sharp inclined or big obliquity coal reserves accounted for about national coal reserves of 15% to 20%,Sharp inclined coal seam of geological structure and the distribution shape from nearly horizontal seam has the very big difference,so it is necessary to sharp inclined coal seam mining of the surrounding rock fracture evolution, and on this basis revealed of rainfall infiltration law lengthy study.This thesis by Beijing Chang Gouyu inclined coal seam mining ditch yuzi group for engineering background,including geological structure, hydrological conditions, coal distribution, coal seam obliquity, atmospheric rainfall and mining section, etc, and collect rock samples for laboratory rock mechanics parameters determination, according to this parameter using reduction estimate the parameters of mining area jointed rock mass,provide parameters for numerical simulation requirements. Using discrete element numerical calculation software coal mining circumstances surrounding rock fracture evolution and distribution rule, according to the above the surrounding rock stress and fracture evolution of research, using discrete element numerical method simulation rainfall infiltration, calculate goaf section and reveal the rain infiltration of the path, infiltration to coal face and goaf; through the fissure evolution and rain water seepage research findings. Along with the increase of mining depth of coal seam upper overburden strata exist due to stress the increase of water-blocking mechanism. To this kind of block water mechanism of existence in-depth study, using fractal theory calculation different coal mining open at fracture and closed evolution distribution dimension, Draw with the increase of mining depth of surrounding rock fracture closure rate, founding that increasing the linear relation between. Finally the fissure closure of rate and mining section the curvilinear relationship between explains the water-blocking mechanism of existence, using this mechanism of mining and reasonable water disaster prevention and treatment, for mining safety provide certain help.