Pingdingshan, China
Pingdingshan, China

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Guo D.-Y.,China University of Mining and Technology | Zhang H.-J.,China University of Mining and Technology | Lu P.-F.,China University of Mining and Technology | Zhang G.-W.,Pingdingshan Tianan Coal Co.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2014

This article aims at the influence of fault structure on permeability-improved effect and coal-bed deep-hole cumulative blasting safety. The dependence of crack generation and growth upon fault was analyzed on the base of theoretical analysis, numerical simulation and field test. The effect of fault on blasting safety was discussed from two aspects of gas occurrence and blasting energy propagation. Numerical simulation results demonstrate that fault affects blasting crack growth and stress wave propagation. Field test shows that permeability-improved effect in the fault-affected zone is 1.6 times better than that in no fault-affected zone, and that the fault zone, which easily causes punching phenomena, has important influence on blasting safety.


Guo D.-Y.,China University of Mining and Technology | Lu P.-F.,China University of Mining and Technology | Wang Y.-G.,China University of Mining and Technology | Yang R.,Pingdingshan Tianan Coal Co.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2013

In view of the technical parameters of cumulative blasting to improve the permeability of coal seams with low permeability, under the condition of constant charge diameter, blast holes were designed with different charge coefficients and blast spacings, and then field test was carried out. The variation of gas drainage pure quantity before and after blasting was comparatively analyzed in blasting influence area, and the influence of blasting parameters on the permeability-increasing effect of coal seams was investigated on the basis of experimental data. It is shown that the permeability-increasing effect of coal seams can be improved by controlling blast-hole radial charge decoupling coefficient, axial charge length, sealing reliability, and blasting times.


Wang W.,China University of Mining and Technology | Cheng Y.-P.,China University of Mining and Technology | Yuan L.,China University of Mining and Technology | Chen R.-Z.,Pingdingshan Tianan Coal Co. | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

In deeper underground short-distance upper protective seam extraction, substantial amounts of relief gas absorbed in the protected coal seam would influx into the working face of the protective seam through the floor mining-induced fractures, which might cause gas concentration exceeding the statutory limit. This paper takes the 5th Mine of Tianan Coal Co., Ltd. as a case, and studies the floor fracture evolution and relief gas drainage timeliness in deep underground short-distance upper protective seam extraction, using the methods of theoretical analysis, laboratory test, field survey and 3D distinct element numerical simulation. It concludes that the floor area could be divided into initial stress region, pressure relived and permeability enhanced region (PRPER), and re-compacted region. In the PRPER, the coal permeability enhancements was accompanied with its swelling, the mining-induced floor fracture became fracture gas channel connecting the protected coal seam to the protective working face. On the time scale, the PRPER occurred during the period between the initial extraction and the collapse of main roof. The fracture gas channel re-compacted and disappeared gradually with the collapse of main roof. During the normal excavation, the area of PRPER held a positive correlation with the periodic weighting, and reached its peak when the preliminary extraction proceeded. In the re-compacted region, coal and rock stratum would suffer the stress of loading-unloading-reloading, generating certain damage and failure, and finally contribute to the gas desorption as well as the shrinkage of coal. The PRPER is the primary space that relief gas generates and migrates, and it is thus the target area for highly efficient relief gas drainage. When proceeding gas drainage projects, it is advised to consider the effect of the time-space on the fracture evolution induced by mining. © 2016, China Coal Society. All right reserved.

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