Proposal for rational disposal of the abandoned-stope and relief of the mining pressure for a lead-zinc mine

The present paper is aimed at introducing a proposal for rational disposal of the abandoned-stope and relief the mining pressure for a lead-zinc mine and in turn to avoid the rock burst,which occurrs from time to time. Such accidental bursts come out frequently while the pillars were taken away above 900 m and the chamber was mined in a depth,to say the least,below 900 m beneath the earth surface. Though it is necessary for the sake of safety and economy,yet it has become a very reckless origin of the unfortunate accidents. To solve the trouble-making problem,we have developed a new method for disposal of abandoned-stope and relief mining pressure on the basis of stress numerical simulation extracting pillars,disposing abandoned-stope and relieving this pressure. To achieve our purpose,we have first of all made efforts in finishing an ANSYS numerical simulation to learn how to dispose of the abandoned-stope and release the mining stress by studying the construction parameters of the stope. Our investigation helps to believe that the horizontal width of the prop-ups should be 20 m from the edge of the forsaken-stope to tunnel outside the hanging side if the horizontal width of the prop-ups is 10 m from the edge of the abandoned-stope to tunnel outside the heading side. Moreover,the partition mining depth to be built should not be more than 20 m below the tunnel floor. From tunnel outside hanging side and heading side of the veins to the abandoned-stope,it is also necessary to implement a V-shaped loosening blasting in the nearby forsaken-stope. What is more,it is possible to carry out the partition mining only on the hanging tunnel bottom plate. Besides,it is necessary to apply the aforementioned project by disposing the steeply inclined abandoned-stope relieving its mining pressure by fully applying the advantages of the method,which are surely expected to bring about reasonable material thrift,reliable safety and great economic benefits. It is a new method suitable for mining steep,big and thick ore-body to dispose the abandoned-stope and relieve its mining pressure in case the surface movement and subsidence is allowed. And,needless to say,if the surface movement and subsidence is not allowed,it may simply imply that it isn't proper to use the new method. Thus,it can be concluded that the method for disposing the steeply inclined abandoned-stope relieving its mining pressure is an integrated method for disposing the forsaken-stope,which can help to use the forsaken stope and orient the advantages onto the safety production and other industrial benefits via the engineering blasting.