Case study of microseismic techniques for stability analysis of pillars in a limestone mine Kim, Chang Oh; Um, Woo-Yong; Chung, So-Keul; Cheon, Dae-Sung;
This study deals with the case that was the field application of the microseismic monitoring techniques for the stability monitoring in a domestic mine. The usefulness and limitations of the microseismic techniques were examined through analyzing the microseismic monitored data. The target limestone mine adopted a hybrid room-and-pillar mining method to improve the extraction ratio. The accelerometers were installed in each vertical pillar within the test bed which has the horizontal cross-section . The measured signals were divided into 4 types; blasting induced signal, drilling induced signal, damage induced signal, and electric noise. The stability analysis was performed based on the measured damage induced signals. After the blasting in the mining section close to the test bed, the damage of the pillar was increased and rockfall near the test bed could be estimated from monitored microseismic data. It was possible to assess the pillar stability from the changes of daily monitored data and the proposed safety criteria from the accumulated monitored data. However, there was a difficulty to determine the 3D microseismic source positions due to the 2D local sensor arrays. Also, it was needed to use real-time monitoring methods in domestic mines. By complementing the problems encountered in the mine application and comparing microseismic monitored data with mining operations, the microseismic monitoring technique can be used as a better safety method.
A Study on Stability Analysis of Large Underground Limestone Openings considering Excavation Damaged Zone, Tunnel and Underground Space, 2016, 26, 2, 131
Cheon, D.S., Jung, Y.B. and Park, E.S., 2014a, Development of acoustic emission monitoring system for the safety of geotehcnical structures, J. of Korean Tunnelling & Underground Space Association., Vol. 16, 471-485.
Cheon, D.S., Jung, Y.B., Park, E.S., Song, W.K. and Jang, H.J., 2011, Evaluation of damage level for rock slopes using acoustic emission technique with waveguides, Engineering Geology, Vol 121, 75-88.
Cheon, D.S., Jung, Y.B., Park, E.S., Synn, J.H. and Park, C.W., 2014b, Application of MS technique to the domestic tunnel site, General assembly and annual conference of Korea Tunnelling and underground space association., Seoul, 65-66.
Cheon, D.S., Park, E.S., Jung. Y.B. Park, C. and Synn. J.H., 2008, Monitoring technique using acoustic emission and microseismic event, Tunnel & underground space, Vol. 18, 1-9.
Hong, J.S., Lee, H.S., Lee, D.H., Kim, H.Y., Choi, Y.T. and Park, Y.J., 2006, Microseismic event monitoring of highly stressed rock mass around underground oil storage caverns, Tunnelling & Underground Space Technology, No. 214.
Kim, Y.B., Chung, S.K., Jo, S.H., Kim, C.O. and Um, W.W., Hybrid room-and-pillar mining method, Patent No. 1015657890000, 2015.10
Park, B, Park, S., Choi, Y. and Park, H.S., 2015, Calculation of a diesel vehicle's carbon dioxide emission during haulage operations in an underground mine using GIS, Tunnel & underground space, Vol 25, 373-382.