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Dai H.-Y.,China University of Mining and Technology | Dai H.-Y.,State Key Laboratory for GeoMechanics and Deep Underground Engineering | Guo J.-T.,China University of Mining and Technology | Yan Y.-G.,China University of Mining and Technology | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Strip mining method, backfill mining method and coordinated mining method are mainly used for strata movement control in China. But these methods with the disadvantage of low recovery ratio or high production. So, a new mining method was proposed that a small coal pillar is left and backfilling is performed on either one or both sides of the pillar, followed conventional mining immediately next to the backfilled structure in this paper. It proposed the arrangement and size design principle of the keeping coal pillars, mining width and backfilled width. Analyzed the over laying strata movement control principle and the essence, the principle of joint support with small pillar and backfill bodies next to it, and the whole mining area is sub-critical. This mining method is of sound subsidence control effect verified by physical simulation model simulation, and revealed the control mechanism of surface and strata movements. Using this mining technology of leave small pillar, and followed backfilling on either one or both sides of the pillar, and then followed conventional mining immediately next to the backfilled structure, it made the project design of mining under villages in the field test area of a coal mine. The surface movement and deformation prediction result shows that it has a significantly effect of reducing surface subsidence and surface structures' damage degree can be effectively controlled. The technology provides a new means to improve the mining recovery ratio of the resources under the surface object to be protected, decrease the cost of backfilling, and diminish the surface damage degree. Source


Zhang R.X.,China University of Mining and Technology | Zhang R.X.,Kailuan Group | Lv Y.K.,China University of Mining and Technology | Jiang C.,China University of Mining and Technology
Advanced Materials Research | Year: 2014

Traditional trellis support was mainly used in deep mining roadway of Kailuan group. With the increase of mining depth, section of roadway and deformation of surrounding rock also increased gradually. As a passive support ways of roadway, trellis support had been unable to meet the requirements of high yield and high efficiency comprehensive mechanized mining. Therefore, anchor bolt supportis in urgent need to turn passive support into active support and to ensure the safety and the stability of surrounding rock of roadway, meanwhile, the cost saving and boosting yield was made sure. This paper is based on the physical and mechanical parameters of coal seam roof and floor of working face 1357w, numerical simulation method was took, and the parameters of anchor bolt support suitable for the roadway with working face were also studied. The result of study could provide theoretical basis for later projects. © (2014) Trans Tech Publications, Switzerland. Source


Zhang R.X.,Kailuan Group | Jiang C.,China University of Mining and Technology
Advanced Materials Research | Year: 2014

This paper takes typical stoping of deep-mine dynamic pressure working face of Zhaogezhuang mine of Kailuan mining area for the research background, relieving the dynamic pressure of roadway of burst tendency through building defect method in dynamic pressure roadway. Putting forward the theoretical solution of defect method in dynamic pressure roadway based on elastic-plastic theory;Taking numerical simulation method in view of the material inhomogeneity of actual engineering geological, researching the characteristics of stress distribution of roadway surrounding rock after relieving in defect method; Applying the theory to the stoping of deep-mined impact working face, and the implement effect is good on the spot. © (2014) Trans Tech Publications, Switzerland. Source


Zhang R.X.,China University of Mining and Technology | Zhang R.X.,Kailuan Group | Jiang C.,China University of Mining and Technology | Lv Y.K.,China University of Mining and Technology
Advanced Materials Research | Year: 2014

The instability failure of coal and rock mass occur frequently in deep mining. However, this destruction occurs with abnormal intensity and suddenness, with hardly any obvious macro precursors. The ability to extract this precursory information and make certain the relationship among the parameters is therefore important. During the process of instability and failure of coal samples, the evolution characteristics of deformation field were monitored by digital image correlation system. Base on the researches, the appearance of the deformation localization band could be divided into three time periods for the samples which all had splitting failure. During period I, the relative sliding component increased rapidly. During period II, the relative tension component increased rapidly. During period III, both the relative tension and relative sliding components increased rapidly. © (2014) Trans Tech Publications, Switzerland. Source


Yao Z.,Hebei United University | Zhao Q.,Kailuan Group
Advanced Materials Research | Year: 2011

The on-line fault diagnostics technology for machines is fast emerging for the detection of incipient faults as to avoid the unexpected failure. On the basis of fault diagnosis theory and method, this paper presents a applications of techniques for fault detection and classification in rotating machinery based on fuzzy theory and neural network theory, the basic structure and working principle of the fault intelligent diagnosis system are introduced, the knowledge stored in the neuron-fuzzy system has been extracted by a fuzzy rule set with an acceptable degree of interpretability, the model of fuzzy fault diagnosis and the self-study principle are described. The practice proves that this is an effective method of large-scale and complicated electronic equipment, and it can also be applied to other fault diagnosis of complex systems and has certain portability. Source

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