Shanxi Engineering Research Center for Green Mining

Taiyuan, China

Shanxi Engineering Research Center for Green Mining

Taiyuan, China
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Zhang Y.-J.,Taiyuan University of Technology | Zhang Y.-J.,Shanxi Engineering Research Center for Green Mining | Feng G.-R.,Taiyuan University of Technology | Feng G.-R.,Shanxi Engineering Research Center for Green Mining | And 9 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2017

Considering the wide-range and nonlinear characteristics of strata movement and the demand between large range and high precision in the physical simulation of water-preserved mining, a method for improving displacement measurement precision in physical modeling has been proved by experiments. The results show that the measurement accuracy is improved as the number of reference points and displacements increase. The increase of the number of reference points could reduce the system error which fluctuates in a range depending on the number of reference points and the fluctuation ascribes to the plus or minus of error. The mean error starts to reduce and diminish significantly when the number of reference points is 15 and 25 respectively. Therefore, at least 25 reference points are required to ensure the required precision. The method suggests a way for measuring strata movement in mining physical models. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.


Zhang Y.-J.,Taiyuan University of Technology | Zhang Y.-J.,Shanxi Engineering Research Center for Green Mining | Feng G.-R.,Taiyuan University of Technology | Feng G.-R.,Shanxi Engineering Research Center for Green Mining | And 2 more authors.
Advances in Materials Science and Engineering | Year: 2017

As main composition of longwall gob, caved rocks' behaviors and their impacts under compression crucially influence strata control, subsidence, associated resources extraction, and many other aspects. However, current researches are based on a whole sample, due to looseness of caved rocks and limitation of observation technology. In this paper, an experiment system was built to investigate internal behaviors of caved rocks' sample, under the uniaxial confined compression, including movement and breakage behavior by the digital image processing technologies. The results show that the compression process of caved rocks could be divided into two stages by relative density. Boundary effect and changes of voids and contact pressure among caved rocks lead to different movement law in different position in sample's interior. A stratification phenomenon of breakage was discovered, which presents breakage concentration in the middle of the sample. The nonlinear movement and shear dislocation induced by shifts among caved rocks are the reason of the breakage stratification phenomenon. This phenomenon would have an effect on the permeability and seepage research of similar medium. © 2017 Yu-jiang Zhang et al.


Zhang Y.,Taiyuan University of Technology | Zhang Y.,Shanxi Engineering Research Center for Green Mining | Feng G.,Taiyuan University of Technology | Feng G.,Shanxi Engineering Research Center for Green Mining | And 12 more authors.
Energy Policy | Year: 2016

Although China owns large coal reserves, it now faces the problem of depletion of its coal resources in advance. The coal-based energy mix in China will not change in the short term, and a means of delaying the coal resources depletion is therefore urgently required. The residual coal was exploited first with a lower recovery percentage and was evaluated as commercially valuable damaged coal. This approach is in comparison to past evaluations when the residual coal was allocated as exploitation losses. Coal recovery rates, the calculation method of residual coal reserves and statistics of its mines in China were given. On this basis, a discussion concerning the impacts on the delay of China's coal depletion, development of coal exploitation and sustainable developments, as well as technologies and relevant policies, were presented. It is considered that the exploitation of residual coal can effectively delay China's coal depletion, inhibit the construction of new mines, redress the imbalance between supply and demand of coal in eastern China, improve the mining area environment and guarantee social stability. The Chinese government supports the exploitation technologies of residual coal. Hence, exploiting residual coal is of considerable importance in sustainable development of the coal industry in China. © 2016 Elsevier Ltd


Hao B.,Taiyuan University of Technology | Hao B.,Shanxi Engineering Research Center for Green Mining | Zhang Y.,Taiyuan University of Technology | Zhang Y.,Shanxi Engineering Research Center for Green Mining | And 10 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2015

To ensure the safe passage of the collapse column in the fully-mechanized top-coal caving mining face, the numerical simulation of the interrelation between the mine-induced stress and stress of collapse column was conducted. The results show that the interaction effect between the mine-induced stress and stress of collapse column can be divided into three stages: weak sub-stage, medium sub-stage and fierce sub-stage, the range of whose distance between the working face and the collapse column are 150-100 m, 100-50 m and less than 50 m respectively. Focal points differ in these three stages: in the weak sub-stage, the collapse column should be pre-reinforced, when the mine-induced stress begins to exert an effect on the stress of the collapse column; in the medium sub-stage, the stress of the collapse column starts to impact the mine-induced stress; and in the fierce sub-stage when the interrelation becomes fierce, the roof management should be strengthened. According the above research, the supporting range of roof in the K8403 working face, and the time and strength of the collapse column pre-reinforcement were identified. Meanwhile, the field practice showed that pre-reinforcement of the collapse column had a positive effect and ensured the safe passage of the collapse column. ©, 2015, China University of Mining and Technology. All right reserved.

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