Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

Since microseismicity tends to increase rapidly before the macro-failure of rock mass structures, it can be used to detect the preliminary signs of the failure. Therefore, it is considered to be one of the measures for the safety accidents of underground mines that are occurring in Korea recently. In this paper, we introduce the ISRM suggested method for in situ microseismic monitoring and analyze the waveform characteristics measured at the domestic sites to provide basic data that can be used for the safety monitoring of rock structure in the future. When applying a microseismic monitoring system to an underground mine, attention should be paid to electrical noise, shock caused by blasting, dust, and rockfall. As a result of analyzing the microseismic waveform, the waveform related to the rock mass damage was a single and burst type, and the waveform induced by blasting lasted for a couple of seconds and its amplitude was relatively high. The microseismic waveform due to the breaking and the drilling has a periodic shape. In the case of the mucking operation, there is no distinct feature but a different waveform compared to others. The crushing operation showed that the amplitude of the vibration acting on the rock was smaller than the noise heard by the ear.