Dahongshan Copper Pillar Technology Research,

As a non-renewable mineral resources is left to us by the Earth's precious wealth, rational development and utilization of resources, is today an urgent need to resolve. In metal mining in the past the process of underground mining, mining-rich abandoned the poor, leaving a number of lean ore; using an empty field method of mining some of the mines, left behind some pillar; In addition, structures built to protect the surface, rivers and lakes, and Roadway There are some mines need to stay in the security pillar. Therefore, the timely and effective manner back to the mining column on the full use of national resources, to extend the service life of mine to improve economic benefit of mine, have extremely important significance. In this paper, copper pillar recovery Dahongshan background for the study, using field investigation, numerical simulation and ground pressure monitoring measures such as research methods, through research, has made some meaningful results.The first, Dahongshan copper rock is layered structure, fault and a weak macro-structure side is the main controlling factor, but little effect on the overall rock excavation, the overall stability of the better rock. In the pillar recovery in fault and so on from time to consider the impact of a large structure, but should pay attention to the impact of structural planes.The second, Dahongshan copper pillar recovery is possible in theory, will not be pillar of the recovery of the ground pressure pose a serious threat to undermine the whole mining system.The third, obtained by numerical simulation, Dahongshan copper pillar extraction is not a normal production of the entire system to produce a security threat. Simulation results show that Dahongshan copper pillar extraction of the entire system to a certain extent, but had little impact by, strengthening the filling, set the middle pillar and other methods can be effectively controlled.The fourth, design optimization of the pillar extraction program-Shallow Hole Stoping. The program stope structure parameters as follows:along the ore column height 1/3H below two meters of mine left wall as a protective layer thickness,1/3H stay for more than one meter ore wall, the mine was ladder-type wall morphology. Through on-site industrial test to determine the recovery program to obtain good results, the process of recovery after deformation monitoring, deformation stope a small amount of ground pressure, appear obvious.The fifth, creatively put forward the non-gel under the conditions of the end of the sand filling of pillar recovery process and methods. Through research and industrial recovery test, column 0 to achieve back to mining dilution,62% recovery rate of good results.The sixth, solve the non-gel under the conditions of the end of the sand filling a narrow pillar (5～8 meters) of ground pressure control, ground pressure, and other issues appear to realize the security pillar mining has changed the Dahongshan copper pillar can not stoping situation.