Creep properties and a creep equation of delay outburst coal and its adjacent mudstone |
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| Affiliation: | 1. Department of Mining Engineering, Science and Research Branch, Islamic Azad University, Tehran 1477893855, Iran;2. Faculty of Mining, Metallurgy and Petroleum Engineering, Amir Kabir University of Technology, Tehran 158754413, Iran;3. Department of Petroleum and Mining Engineering, Shahid Bahonar University of Kerman, Kerman 7616914111, Iran;1. School of Mines, China University of Mining and Technology, Xuzhou 221116, China;2. Jining No. 2 Coal Mine, Yankuang Group, Jining 272071, China;1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China;2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China;1. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Department of Civil, Geological and Mining Engineering, Ecole Polytechnique de Montreal, Montreal H3C3A7, Canada;3. Beijing General Research Institute of Mining and Metallurgy, Beijing 100160, China;1. School of Civil Engineering, Wuhan University, Wuhan 430072, China;2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. School of Mines, China University of Mining and Technology, Xuzhou 221116, China;3. Civil Engineering Department, Yancheng Institute of Technology, Yancheng 224051, China |
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| Abstract: | The study of the creep properties of coal and its adjacent mudstone is very important for understanding the mechanism of delay outburst coal. The samples of delay outburst coal and its adjacent mudstone collected from Yongshanqiao mine were used to carry out triaxial creep tests. The influence of confining pressure and axial compression on the creep test was analyzed. An accelerated creep model was constructed in parallel with a nonlinear viscous component and plastic component. It is connected with the traditional Burges creep model in series. A creep model which can describe the nonlinear viscoelastic-plastic creep model of rock was established and the corresponding creep equation was derived.According to the results of the creep test, the related parameters of the equation were fitted. The results show that, under the same confining pressure, instantaneous creep strain, creep strain of deceleration phase and constant rate creep of the coal and its adjacent mudstone are increased with an increase in the deviatoric stress. But at the same axial pressure, all of the above decrease with an increase of confining pressure. The duration time of the deceleration creep phase increases with the increase in the deviatoric stress. The theoretical values of the creep equation are in good agreement with the experimental results. It indicates that the creep properties of the delayed outburst coal and its adjacent mudstone can be well described by the creep model established in this paper. |
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| Keywords: | Delay outburst Creep test Coal Mudstone Creep equation |
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