金川矿山围岩动态演化及其力学参数研究

DYNAMIC EVOLUTION AND MECHANICAL PARAMETERS OF SURROUNDING ROCKS IN JINCHUAN NICKEL MINE

针对目前金川岩体力学研究中存在的问题,提出用系统论方法,分析不同部位不同时间岩体特征参数的测试试验结果,尤其是地应力场和岩体结构特征,研究岩体动态演化规律。岩体诸特征参数从不同侧面共同反映了岩体系统的特征,根据它们之间的相关关系,用某些简单且易获得的参数来确定那些难以获得的参数。地应力场和岩体结构是金川矿山工程岩体的主要控制因素,但岩体结构又明显受应力场控制,岩体特征及其演化是地应力场作用的结果,用之确定岩体力学参数及其时空变化特征反映了金川岩体的本质。弹性波速度是岩体诸要素的综合反映,用之研究岩体力学性质的时空变化特征及确定力学参数,简便可行。

Some problems of rock mechanics involved in Jinchuan nickel mine are discussed firstly. From the view of systematology,the dynamic evolution and spatial variation of rocks and its corresponding mechanical parameters under excavation condition can be studied through analyzing some typical parameters,such as stress field,rockmass structure,mechanical parameters,at different places in this mine. Researches show that the rocks in Jinchuan mine are mostly controlled by stress field and rockmass structure and that all other factors are controlled by in-situ stresses,so the dynamic evolution and mechanical parameters of rockmasses are studied in essence from spatial and time variation of stress field. Elastic wave velocity and mechanical parameter are related to each other in nature because they are all synthetic response factors of rockmasses. The rules of the dynamic evolution of rockmasses and their mechanical parameters are achieved on the basis of elastic wave velocity.