大姚铜矿采场围岩破坏时的声发射特征

CHARACTERISTIC OF THE SOUND SHOOT AT THE TIME OF STOPE SURROUNDING ROCK FAILURE IN DAYAO COPPER MINE

本文采用模拟实验和现场稳定性监测相结合的方法,研究了大姚铜矿采场围岩破坏过程中的声发射特征,分析了大爆破对采场围岩稳定性的影响。大姚铜矿采场顶底板砂岩在破坏过程中声发射具有双峰性,主破裂前存在声发射相对平静现象。通过记录的巷道片帮过程中声发射分析,提出了采用声发射前兆峰值,可以较准确地预报岩体冒落事故。

By means of combined method of simulated tests and site stability monitoring, characteristic of sound shoot in course of stope surrounding rock failure in Dayao copper mine is researched and influence of large scale blasting on stability of stope surrounding rock is analyzed. Sound shoot in course of sandrock failure at stope top and floor is of twin - peak character. Before the main bursting there is a relatively quiet phenomenon for sound shoot. Through the recorded sound shoot in coarse of spalling off , it is suggested to use the premonitory peak value for relatively accurate predication of rockfall - related accidents.