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Henan’an, China

Lian X.,LIAONING Technical University | Zhang H.,LIAONING Technical University | Song W.,LIAONING Technical University | Song W.,Henan Shenhuo Group Co. | And 2 more authors.
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

Based on geodynamic zoning, according to topography and landscape features, I ∼ V class active faults are divided and certain local geology structure is determined. Then, the geological model of tectonic stress field is built. Incorporated with in-situ stress measurements, the numerical simulation of regional tectonic stress field is done by using self-developed Rock Mass Stress-state Analysis System software. Then, the distribution law of rock stress of the eighth mine coal seam V9-10 roof can be found, and the influence of the tectonic stress field on coal and gas outbursts is analyzed. The results indicate that the distribution of rock stress depends upon the faults and is formed again because of superposition of the action of faults. Tectonic stress field and its uneven distribution provide dynamic conditions for the occurrence of coal and gas outbursts. Therefore, the regional distribution of coal and gas outbursts in the eighth mine is controlled by them from time to space. © 2011 IEEE. Source


Huang B.-X.,China University of Mining and Technology | Cheng Q.-Y.,China University of Mining and Technology | Liu C.-Y.,China University of Mining and Technology | Wei M.-T.,Henan Shenhuo Group Co. | Fu J.-H.,China University of Mining and Technology
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2011

The structure transform of coal-rock mass is an universal scientific issue for solving many technical problems in coal mine. Hydraulic fracturing is an effective method to transform the coal-rock structure. Aiming at this issue, we analyzed the structure and physico-mechanical properties of coal-rock mass and the hydraulic crack propagation and physical chemistry effect of hydraulic fracturing of coal-rock mass. On this basis, we propose the corresponding hydraulic fracturing control technology and analyze its application in coal mine. The internal structure of coal is composed by four-stage spatial structure system which comprises crack-cleat and stratification-micro fissure-pore. The soft texture of coal, the effect of gas adsorption analysis, the development of natural fractures, and other factors make the hydraulic fracturing of rock-mass complicated. In order to meet the structural transformation, strength decrease, permeability increase, and other engineering needs, the process of hydraulic fracturing for coal rock mass is from the propagation of main hydraulic cracks, the propagation of airfoil branch fissures propagation, and water absorption wetting. The focuses of these three effects are different on different projects. Directional fracturing technology with beforehand hydraulic slotting has been proposed. The weakening strength and increasing permeability technology of hydraulic blasting fracturing has been put forward. The experimental results have proved that the hydraulic fracturing, after water pressure control blasting, is an efficient way to increase the number and range of hydraulic cracks. Hydraulic fracturing of coal-rock mass can be used to control hard roof, to weaken the hard top coal, to transfer the stress directionally, to release the local concentrated stress, to weaken the strength and shock, to increase the permeability of gas-filled coal seam, and to prevent coal-gas from outbursting, and so on. Source


Li C.,China University of Mining and Technology | Li C.,Henan Shenhuo Group Co. | Cai Q.-X.,China University of Mining and Technology | Yuan Y.-J.,China University of Mining and Technology | Zhou W.,China University of Mining and Technology
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2011

The coal loss is mainly induced by "dull coal" which is pressed by end-slope. Through explaining the formation progress of dull coal, combined the status and development of surface mining technology, we analyzed the feasibility of mining dull coal. In light of building the economical evaluation model of mining dull coal, the economic benefit increased when the production and static investment per ton coal added and decreased when other variable fees added. The result shows that the method of mining dull coal can increase the recovery rate by the steep end-slope mining technology and the economic benefit of which is significant. Source


Liao Y.,China University of Mining and Technology | Liu J.,China University of Mining and Technology | Cao Y.,China University of Mining and Technology | Zhu X.,Henan Shenhuo Group Co.
International Journal of Coal Preparation and Utilization | Year: 2014

A large-scale cyclonic-static microbubble flotation column (FCSMC) was tested at the Xuehu coal preparation plant for processing of fine particles (-0.5 mm). A measure of the axial gas holdup profile provided reasons for the deteriorating performance of the FCSMC. The results showed that an excessive mass flow rate of the solids resulted in the loss of mineralized bubbles to the tailings stream, which was responsible for the drop in the combustible recovery and tailings ash. This phenomenon gives rise to the gas holdup profile inversion where the increase of gas holdup from bottom to top decreases. It was shown that the critical tailings velocity of gas holdup profile inversion is exactly the same with the inflection point of carrying capacity and combustible recovery, which demonstrates that it is feasible to diagnose the column operation through the measurement of the axial gas holdup profile. © 2014 Copyright Taylor & Francis Group, LLC. Source


Song S.H.,LIAONING Technical University | Song S.H.,Henan Shenhuo Group Co. | Zhang Z.W.,LIAONING Technical University
Applied Mechanics and Materials | Year: 2013

The geological characteristics of Pingdingshan mining area in China is fault block uplift and the depression in all around. The faults in the region are dominated by NW trending faults. Our researches show that most of faults experience different mechanics process and movement character because of the evolution of tectonic stress field. The regional distribution of coal and gas outburst is consequent on the regional distribution of regional tectonic stress, tectonic coal and gas storage. At the action of SW-NE extrusion stress by the effect of Qinling orogeny belt, the NWW strike structure and the NNE composite tectonics are prone to occur coal and gas outburst because of concentrated stress, low penetrability and good gas storage condition. Also incorporated with in situ stress measurements and the numerical simulation of regional tectonic stress field by using self-developed Rock Mass Stress-state Analysis System software, the mechanism of the tectonic stress field on coal and gas outbursts is analyzed. The results indicate that the distribution of rock stress depends upon the faults and is formed again because of superposition of the action of faults. Tectonic stress field and its uneven distribution provide dynamic conditions for the occurrence of coal and gas outbursts. © (2013) Trans Tech Publications, Switzerland. Source

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