Key technology and engineering application of super large space segmented combination efficient filling

With the depletion of regional shallow resources, the demand for deep resource mining is becoming more and more prominent. Focusing on the actual needs of super-large space, high solid waste content and efficient filling under the background of pressure coal recovery in kilometer deep wells, the key technology of super-large space segmented combination efficient filling mining is put forward. On the basis of traditional paste filling, the goaf segmented construction technology is innovatively constructed to effectively solve the problem of super large filling space construction in deep mine filling mining. At the same time, the paste-gangue combined filling technology is used to significantly increase the proportion of solid waste resource treatment. Supporting research and development of key equipment such as isolation retaining wall to achieve efficient plugging requirements for super-large post-filling space; the ratio test of filling materials was carried out, and the high solid waste content and high strength quick-setting combined filling materials were developed. The successful application of series method-process-equipment in Pingmei No.11 Coal Mine ensures the smooth implementation of efficient combined filling mining in the mining area, effectively liberates the coal resources under this special scene, realizes the large-scale consumption of gangue solid waste.