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Chaoyang, China

Miao X.-H.,State Key Laboratory of High Efficient Mining and Safety of Metal Mines | Miao X.-H.,University of Science and Technology Beijing | Miao X.-H.,URANIUM Resources Inc. | Jiang F.-X.,State Key Laboratory of High Efficient Mining and Safety of Metal Mines | And 4 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

In the sublevel caving longwall face #3201 of Chaoyang Coal Mine, an abnormal phenomenon is detected that the amplitude of detector receiving microseismic wave earlier is bigger than the one receiving microseismic wave later by using high-precision microseismic monitoring system and then a strong underground vibration is felt. In response to this anomaly, the layout of high-precision microseismic monitoring system and system calibration is introduced. Through the abnormal waveform data analysis and preliminary positioning, that the results of microseismic positioning do not meet the requirements of positioning accuracy is discovered, thus negating the basic assumptions of considering the record of the microseismic data as one source to locate. On this basis, a hypothesis is put forward, that is, the mechanism of microseim-induced rock burst is the pattern of the vibration wave of the inital microseismic source inducing another microseismic source by the vibrational failure of s-wave, and the hypothesis is proved strictly. Considering of underground pressure and stratum control and the results of long-term microseismic monitoring, the location of the induced microseismic source is found exactly under the high-stress area of mining-induced stress field and tectonic stress field, which is further proof of the above hypothesis and makes it clear that the induced microseismic source is located in the high-stress areas under the influence of coupling factors. Source


Jiang F.-X.,University of Science and Technology Beijing | Miao X.-H.,University of Science and Technology Beijing | Wang C.-W.,University of Science and Technology Beijing | Song J.-H.,Chaoyang Mine Group | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

By using microseismic (MS) monitoring methods, the classification and early warning methods of tectonic-controlled coal burst were studied. It was proposed that tectonic-controlled coal burst could be divided into two types: stress-increasing type and stress-decreasing type. If microseismic events occur in a limited zone while mining face advancing towards the tectonic zone, it means that mining stress is centralizing in this zone and the possibility of coal burst is increasing. If microseismic events occur in a large zone while mining face advancing towards the tectonic zone, it means that mining stress distributs in this zone and the possibility of coal burst is decreasing. Based on MS events' dynamic feature, distribution rule and energy spread, the burst danger zones can be decided. By drilling detecting holes, the burst danger grades can ensured. This paper's findings were verified and applied in Chaoyang Coal Mine, which was mining strong burst tendency seam at one kilometer mining depth. Source

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