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Li T.,University of Science and Technology Beijing | Zhang S.-L.,University of Science and Technology Beijing | Li S.-F.,Gansu Huating Coal Group | Wang P.,University of Science and Technology Beijing | Wang P.,Gansu Huating Coal Group
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

In order to understand the mechanism and prevention of rockburst in Huating mine, the rupture mechanism of rockburst was inversed, using focal mechanism solution method. Combining with in-situ stress measurement, microseismic monitoring, field investigation, mining analysis and theoretical analysis, the focal mechanism solution method was proved to be reliable, and the appropriate control strategies would be made after analyzing the causes of rockburst. It was concluded that the focal mechanism solution method was effective for mining rupture mechanism inversion. The frequent rockburst in Huating mine was mainly caused by great horizontal stress, the large angle of intersection between maximum principal stress direction and roadway trend, the large unsupported roof of thick sandstone, and the large thickness and strong burst trend of bottom coal. There were severalways to prevent mine rockburst. During coal face design, it should be avoided that the maximum principal stress direction intersected roadway trend with a big angle. Mining lower slice with good impact resistance, relieved vertical mining stress by roof presplitting, roadway drilling and cutting off the floor, were also the major solutions for the prevention of rockburst. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.

Li T.,University of Science and Technology Beijing | Zhang J.-W.,University of Science and Technology Beijing | Lu Y.-G.,Fushun Mining Group Ltd Company | Zhou P.,Gansu Huating Coal Group | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

With the engineering background of Fushun Laohutai Coal Mine and Gansu Huating Coal Field, the quantitative relationship between mining activities and rock-burst was studied to research the influence on the dynamic response of rocks by mining disturbance based on the high-precision mine seismic monitoring over the long time and analysis of mine operation data. According to the relation between the mining-induced seismicity activities in 24 hours and mining work regularity, the mining-induced seismicities that are directly and indirectly correlated to mining activities were distinguished. It is found that the continuous mining has a cumulative effect to mining-induced seismicity, which can be used to evaluate the effect and the range of relieving stress, and adjust operation procedure reasonably to reduce rock-burst activities level. It is considered that the effect of reduce rock-burst activities level has the inverse ratio with mining depth, the dynamic response of rocks has delay-attenuation effect in deep mining. In the condition of Huating Coal Mine, the two working faces are separated by a 210 m goaf, the maximum affect distance of the dynamic response of rocks is 450 m in case of the opposite mining between mining and heading faces, and that is 750 m in case of back-to-back mining, which can be speculated that the biggish affect distance is connected with the thick-bedded and rigid basic roof and coal pillar of 20 m.

Li T.,University of Science and Technology Beijing | Wang W.,University of Science and Technology Beijing | Xie J.,Gansu Huating Coal Group | Xu Y.,Gansu Huating Coal Group | And 4 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

To explore the rockburst prediction principle and applied technology by microseismic method, in mine with high precision microseismic monitoring equipment, the continuous rock crack in mining process on site is monitored and analyzed with laws of rockburst induced by mining and self-made rockburst prediction software MapRAS. The result shows that deep diffusion of rock microcrack induced by mining at roof and floor is the main reason for the occurrence of rockburst. It is proposed that the deeply damaged of roof and floor induced by mining is an important factor in rockburst nucleation. The function and algorithm for identifying rupture damage depths of roof and floor by using microseismic data are established. Analysis displays that between damage depths of roof and floor exist linkage and there is corresponding to cycle breakage of roof key layer, as well as its after-effect, which reflects the loading and unloading processes of roof-floor. Most of the rockbursts in Huating coal field are roadway floor rupture. The engineering test indicates the method has higher prediction performance and good application effect.

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