SEISMIC INVESTIGATION OF ROCK FRACTURE PROCESS IN MINING
Understanding rock fractures and their development in a varying stress environment is important transmission in different fracture zones was carried out at a longwall mine to investigate the relationship between the fractures and seismic velocity and dominant frequency. Twenty triaxial geophones with five deployed in each of four deep boreholes formed a survey network. The seismic transmissions were conducted through repeatedly firing shots in three shot holes into the network on different dates. These shots generated clear seismograms for the velocity and frequency analysis. This study has shown that rock fracturing associated with mining can significantly change the seismic velocity and dominant frequency. At the expenment site the roof caving processes induced extensive fractures in the roof rocks. The changes in the seismic velocity and frequency from 0％ to more than 60％ in relation to intact, partially and fully fractured fracture stages were obtained. The results have demonstrated that both seismic velocity and frequency changes can be used as indicators for diagnosing rock fracture condition. The seismic transmission method can be further developed as an efficient tool for mapping fracture development for engineering stability assessment and production control.
X.Luo
CSIRO Exploration and Mining, PO Box 883, Kenmore QLD 4069, Australia
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）