中国矿山工程

Rock mass occurrence characteristics is of great significance for block caving mining method. This paper based on the study of rock mass occurrence characteristics and physical-mechanical properties of Tongkuangyu Mine in deep, discussing about rock mass cavability, provides vital guidance for mining with block caving in deep. The results show that there are two dominant joint groups in the rock mass of No.4 and No.5 orebodies with NW and SE trending tendencies, and the joint planes dip sharply. The engineering classification of rock mass is hard to harder; rock mass quality classification is II to III and rock mass cavability is moderately to hard, which would result in caving mining with medium broken and more bulk. The method of rock mass pre-conditioning by hydraulic fracturing should be adopted actively in the deep mining, with reasonable planning undercutting place and direction and rate of the first mining area, and supplemented by appropriate inducement projects such as pre-splitting and boudary solt, to improve the rock mass cavability in the deep mine, for the successful use of block caving mining method.