Case study of microseismic tomography and multi-parameter characteristics under mining disturbances

Abstract

Rockburst caused by mining disturbance may cause rock damage. Combining the microseismic (MS) multiparameter, high-magnitude MS event distribution, and MS tomography may be an effective method for hazard precursor identification in underground mining. Firstly, a self-developed MS monitoring system was built in an underground mine in Shaanxi, China. Then, based on the tomography results, a correlation model was established between velocity anomalies and mining activity regions, and rockburst risk areas were delineated. Furthermore, multi-parameters were analyzed, including b value (rock fracture parameter), S value (MS activity), tomography results, high-magnitude MS event distribution and the in-site survey in 795 and 860 levels of Shaanxi Zhen-ao Mine. Ultimately, based on the rockburst case on June 7 and the multi-parameters analysis of 795 level to 860 level of Zhen-ao Mine, the risk areas were identified. MS information can be used as an early warning identification of hazards, and has a wide application in the future.

Keywords

seismic tomography / multi-parameters / microseismic event / microseismic energy / mining disturbances

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