Specification Of The Isolation Pillars In Deep Mining Of Huanren Lead-zinc Mine

The mine-out area, which is inevitably experienced during undergoudn mining, may lead to the stress redistribution in the surrounding rockmass, the deformation, failure and statra movement, and thereore it is one of potential safety problems in mines. As the undergoung mine goes deep, the ground pressure problems caused by mined-out area become more prominent.Based on the summary of main categories of mine-out area and their processing methods, several key related issues are discussed. The basic function, influential factors and applicable conditions of isolation pillar are summaried, and based on actual situation of Huanren lead-zinc mine, the layout of the isolation pillar under different circumstances is presented, which lays the basis for the mining safety. The main work is as follows::(1)The existing mined-out areas in the two stopes of huanren mining are investigated in detail, and based on which, the details of the large mined-out area that may influence the deep mining, such as exposed area, the exposure time and the largest span, are understood.(2)Through a large amount of rock mechanics test and the comprehensive analysis on the instability damage of the existing mined-out area, the main rock mechanics parameters are determined.(3) According to the actual situation at Huanren lead-zinc mine, the schemes of the isolation pillars are determined. By utilizing the three-dimensional FLAC software, a variety of selected schems for isolation pillars are compared and analyzed to determine the structural parameters of the isolation pillar in order for ensuring the safety of deep mining.(4) Based on the actual situation of the longwall mining method in songlan stope, by using the numerical simulation analysis, the reasonable structural parameters of this mining method are determined.(5) According to the stress analysis of the isolation pillars that have been selected, the location where the stress concentration and possible damage may occur, are determined. The ground pressure monitoring measures to ensure the mining safety are put forward...