Yima Coal Industry Group Corporation Ltd.

Yima, China

Yima Coal Industry Group Corporation Ltd.

Yima, China

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Li S.-M.,Henan Polytechnic University | Li S.-M.,Yima Coal Industry Group Corporation Ltd. | Wei Q.-D.,Beijing University of Technology | Liu J.,Yima Coal Industry Group Corporation Ltd.
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

This paper focuses on the causes of rockbursts around open-off cut through theoretical analysis and field investigation. In this study, a method of determining an appropriate open-off cut position was proposed based on abutment pressure distribution. The study result shows that when the open-off cut is placed in the area under the influence of self-weight of overlying strata, the transferring stress of gob zones and tectonic stress, the superimposed stress exceeding the critical stress is the main cause of rockburst. The fracture angle of overlying strata was estimated by analyzing the field microseismic monitoring data. Combined with overlying strata spatial structure theory, an abutment pressure estimation model was presented. Using this model, overall superimposed stress was successfully computed and the abutment pressure distribution curve was also obtained. Using dynamic stress ratio as the distinguishing criterion of rockburst risk, the rockburst risk zones can be identified according to the empirical value, providing basis for determining appropriate open-off cut position and field rockburst control intensity. The study result has been successfully applied in a coal mine in Henan Province, China. ©, 2016, China Coal Society. All right reserved.


Wei Q.,University of Science and Technology Beijing | Jiang F.,University of Science and Technology Beijing | Yao S.,University of Science and Technology Beijing | Wei X.,Yima Coal Industry Group Corporation Ltd. | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2015

By means of theoretical analysis and field observation, the occurrence cause of rock burst in dip coal pillar area of extra-thick coal seam, and the real-time monitoring and early warning technology were studied in this paper. The results show that the strata structure of dip pillar area and the asymmetric I-shaped spatial strata structure formed by excavation are primary causes of abnormal stress concentration. By establishing spatial strata structure model and strike abutment pressure calculation model in the dip pillar area, the stress distribution law of the overlying strata in the pillar area was obtained. It is revealed that the stress distribution area movement and value variation are the main causes of rock burst in the dip roadway near the coal pillar. In addition, the integrated monitoring and early warning of rock burst in dip coal pillar area were proposed, that is, the strata fracturing and movement were monitored by microseismic system, and the risk region of rock burst was predicted by index of microseismic momentum, while the risk level of rock burst was further predicted by borehole stress maters. Thus, the monitoring and pre-warning system of "regional monitoring and prediction and local monitoring and early warning" were established. The research achievements were applied to the dip coal pillar area of No.21 mining district, Qianqiu coal mine successfully. ©, YYYY, China University of Mining and Technology. All right reserved.


Xu S.-M.,Henan Polytechnic University | Li S.-Y.,Yima Coal Industry Group Corporation Ltd. | Li D.-X.,Xi'an Jiaotong University | Zhang W.-P.,Yima Coal Industry Group Corporation Ltd. | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

In order to guide the work of preventing and controlling rock burst scientifically, using the statistics theory, based on more than 200 boreholes data and the geological sketch of deep roadways, the diagrams of the isoline of related geological factors and rock burst incidents were drawn, the geological causes of rock burst in Yima Coalfield were analyzed, and the function law of main geological factors were investigated. The results show that the rock burst in Yima coalfield is caused by the combined effect of geological and mining factors, in particular, the special geological condition is a dominate factor. There are some positive correlations between the rock burst and the factors such as the thickness of conglomerate roof, the coal thickness, and the mining depth, but negative correlation between the rock burst and the distance to No. 16 reverse fault. Rock burst occurrence is affected by several geological factors, not a single geological factor. The key cause of rock burst occurred wholly in coal road is the strata structure of "two hard and one soft", the upper being harder but the lower softer, and the bottom being the softest. The study shows that the area including Yima syncline core and the belt of adjacent to No. 16 reverse fault exists high risk of rock burst due to the huge thick conglomerate, the tectonic stress concentration, and deeper depth. © 2015, China Coal Society. All right reserved.


Jiang F.-X.,Beijing University of Technology | Wei Q.-D.,Beijing University of Technology | Wang C.-W.,Beijing University of Technology | Yao S.-L.,Beijing University of Technology | And 4 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Through theoretical research and field exploration, the mechanism and control method of rock burst happened in extra-thick coal seam of working face controlled by huge thick conglomerate and thrust fault were studied with typical cases analysis. The calculation model of static side abutment pressure was established through studying the stratum structure and overlying strata spatial structure, and the distribution law of the stratum structure and stress of No.21221 working face. By means of stress superimposing including transmission stress of conglomerate, in-situ stress and tectonic stress, the final value exceeded the critical stress value inducing rock burst. Under superimposed stress effect, extra-thick coal seam slid and formed slip-line field gradually, and at the same time plastic swelling occurred resulting in stress increase around the roadway, which was the main cause of rock burst occurrence. Aiming to control this kind of rock burst effectively, we can design the position of roadways and the parameters of pressure-relieving boreholes reasonably, and adopt mixed coal-rock roadways. The research results were successfully applied to rock burst control in several coal mines of Yima.


Ye Q.,Hunan University of Science and Technology | Ye Q.,China University of Mining and Technology | Ye Q.,Yima Coal Industry Group Corporation Ltd | Lin B.-Q.,China University of Mining and Technology | And 2 more authors.
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2011

To master the effect of the magnetic fields produced by the giant mechanical and electrical equipments in coal mines on methane explosion, experimental investigations were conducted to explore the influences of the magnetic fields on explosion wave pressure and flame propagation velocity of methane explosion. And theoretical analysis was carried out to discuss the effect of the magnetic fields on heat transportation, mass transportation and reaction process of methane explosion and its propagation. It shows that the magnetic field can enhance methane explosion intensity and increase flame propagation velocity, explosion pressure. The more the magnetic field intensity, the more markedly the magnetic field affects methane explosion. The magnetic fields can increase turbulence by increasing mass transfer action, heat transfer action, convection effects, diffusion coefficient and entropy of the reaction system, so the magnetic fields can increase flame combustion velocity, flame propagation velocity, release more energy and increase shock wave energy, and then promote the methane explosion and its propagation.

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