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Wang X.-F.,China University of Mining and Technology | Wang X.-F.,State Key Laboratory of Coal Resources and Safe Mining | Wang X.-F.,Key Laboratory of Deep Coal Resource Mining | Zhang D.-S.,China University of Mining and Technology | And 4 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

Based on the main roof bearing asymmetrical loads when longwall mining under a sand-soil gully slope in shallow coal seam, theory analysis and field observation methods were used, the gully slope and its shape were considered, a roof structure mechanical model was established when the longwall working face backward-gully mining in first and periodic weighting, and a "support and surrounding rock" relation model was analyzed under given instability loads. Furthermore, the support resistance which could control the roof structure sliding instability was obtained. The support resistance changing features were analyzed along the working face advancement combined with practical geological conditions, and the rational support resistance calculation example was provided. The field observation result demonstrated the reliability of the method.


Jiang H.,China University of Mining and Technology | Miao X.,China University of Mining and Technology | Zhang J.,Key Laboratory of Deep Coal Resource Mining | Liu S.,Key Laboratory of Deep Coal Resource Mining
International Journal of Mining Science and Technology | Year: 2016

Based upon characteristic movement features of the overlying strata in solid backfill mining and in-situ observations, an associated model representing a roadway support system has been developed. Based on the Winkler foundation and beam model, the current study presents a static analysis of the model, thus permitting acquisition of a theoretical formula pertaining to roof convergence. Through use of working face 6304-1 (Jisan Colliery) as the research setting, the association between roof convergence magnitude and both packwall strength and width have been elucidated. Based upon observed conditions at the working face, realistic packwall parameters have been formulated, with numerical simulation results and field application results indicating that design parameters garnered from the developed formula successfully adapted to local geological movement and deformation. Accordingly, roadway deformation was shown to be within the permissible range, thus satisfying mine production requirements. The proposed method in the current study may give a design basis for pack design in the context of SBM under similar conditions. © 2016.


Deng X.,China University of Mining and Technology | Zhang J.,China University of Mining and Technology | Kang T.,Key Laboratory of Deep Coal Resource Mining | Han X.,Key Laboratory of Deep Coal Resource Mining
International Journal of Mining Science and Technology | Year: 2016

Based on the character of upward slicing backfilling mining and the condition of Gonggeyingzi coal mine in Inner Mongolia, this paper describes the studies of the strata behavior and the stress distribution in the process of backfilling mining in extra-thick coal seams. This was achieved by setting up and analyzing the elastic foundation beam model using the ABAQUS software. The results show that: (1) With the gradual mining of different slices, the roof appears to bend continuously but does not break. The vertical stress in the roof decreases and the decreasing amplitude reduces, while the tensile stress in the roof grows with the mining slices and the maximum tensile stress will not exceed the allowable tensile stress. (2) The front vertical stress at the working face exceeds the rear vertical stress and both show a trend of decrease with decreasing amplitude of decrease. (3) The slices mined early have more influence on the surrounding rock than the later ones. Similarly, the strata behavior experiences the same trend. The field measured data show that the roof does not break during the mining process, which is consistent with the conclusion. © 2016.


Chang Q.,China University of Mining and Technology | Chang Q.,Key Laboratory of Deep Coal Resource Mining | Zhou H.,China University of Mining and Technology | Zhou H.,Key Laboratory of Deep Coal Resource Mining | And 2 more authors.
International Journal of Mining Science and Technology | Year: 2013

Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expressed in four forms including support anchoring force, tension anchoring force, expansion anchoring force and tangent anchoring force, and their values can be obtained on the basis of each calculation formula. Among them, the expansion anchoring force, which is the unique anchoring force of the hydraulic expansion bolt, can provide confining pressure to increase the strength of rock. Aiming at solving the problem of stability control in the soft rock roadway in Jinbaotun Coal Mine which has a double layer of 40 U-type sheds and cannot provide enough resistance support to control floor heave, the study reveals the mechanism of floor heave in the soft rock roadway, and designs the reasonable support parameters of the hydraulic expansion bolts. The observed results of floor convergence indicate that the hydraulic expansion bolts can prevent the development and flow of the plastic zone in the floor rock to control floor heave. Research results enrich the control technology in the soft rock roadway. © 2013 Published by Elsevier B.V. on behalf of China University of Mining & Technology.


Zhang J.,China University of Mining and Technology | Zhang J.,Key Laboratory of Deep Coal Resource Mining | Jiang H.,China University of Mining and Technology | Jiang H.,Key Laboratory of Deep Coal Resource Mining | And 3 more authors.
Mine Water and the Environment | Year: 2014

Numerous water inrush disasters have been associated with Chinese coal mines over the past 30 years. Accordingly, solid backfill mining (SBM) has been widely adopted to extract coal resources from beneath aquifers to reduce the magnitude and scope of overburden failure. Therefore, accurate determination of the height of the water-conducting zone associated with SBM is particularly important. The primary factors influencing development of water-conducting zones within solid backfill mines have been quantified in the current study, based on overburden movement and deformation characteristics. Numerical simulation has been used to evaluate the height of water conducting zones with respect to mine heights and backfill ratios. The results have been analyzed via multiple regression, leading to the development of a predictive equation. Field trials undertaken as part of the current study indicate a high level of accuracy with the developed equation. © 2014, Springer-Verlag Berlin Heidelberg.

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