Study Of Safety Recovery Technology Of Sill Pillar In High Stage And Large Mining Room

Dayingezhuang Gold Mine of Shandong Zhaojin Group uses the mining method of mechanized upward horizontal slice stoping and backfilling in room and pillar mining, and the height of the midpiece is 80 meters , there is a considerable proportion of sill pillar between two adjoining midpieces .For the sake of the safety and high efficiency in recovery of sill pillar, we take the sill pillar of-210 meter's midpiece , which is on top of 4217 stope of -290 meter's midpiece, as an experiment to study and research mining method and stoping technology , from which we summarizes the regularities in recovery of sill pillar and put it to recover other stopes' sill pillar.The rationality of the upward drift stoping with backfill method in recovering sill pillar has been demonstrated in this paper, and summarizes safety measures for sill pillar mining. For example , it is necessary to inject grout and install long rope bolt to reinforce the supporting effect firstly; and then I determined the thickness of the top floor through numerical simulation. The remainder can be classified into three enter routes.The stoping technology of drift mining is discussed from the following aspects. ventilation system,development technology,transportation systems,backfilling system, etc. Also in this paper a series of safety protecting measures are put forward.