铜矿峪矿深部矿岩赋存特征研究对自然崩落法开采的指导意义

The Guiding Significance of Study on Rock Mass Occurrence Characteristics in Tongkuangyu Deep Mine for Block Caving Mining Method

本文通过对铜矿峪矿深部矿岩赋存特征及其物理力学特性研究,探讨深部矿岩可崩性,为矿山深部自然崩落法开采提供重要的指导意义。研究表明:4^(#)、5^(#)矿体岩体中存在倾向为北西向和南东向的两组优势节理组,节理面陡倾;岩石坚固程度属坚硬岩~较坚硬岩;岩体质量属Ⅱ~Ⅲ级,破碎特性为中等大块~大块较多,可崩性属难崩~中等可崩。为改善深部矿岩可崩性,在深部开采时还应积极引用水压预裂矿岩预处理技术,合理规划首采区拉底部位、确定拉底推进方向、控制拉底速率,并辅以适当的预裂、割帮等诱导工程,以实现自然崩落法的成功开采。

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 isⅡtoⅢand 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.