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Creep properties and a creep equation of delay outburst coal and its adjacent mudstone

查看全文 作　　者：Lu [1]Haifeng;Zhao [1]Zhigen 高影响力作者 机构地区：[1]School of Earth and Environment,Anhui University of Science and Technology高影响力机构 出　　处：《International Journal of Mining Science and Technology》索引2016年第26卷第6期,共7页高影响力期刊 基　　金：provided by the National Natural Science Foundation of China (Nos.41172138, 41472235, and 51474008);the Natural Science Foundation of Anhui Province (No.1508085QE89) 摘　　要：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. 关 键 词：蠕变方程 延期突出 蠕变特性 泥岩 邻近 延迟 三轴蠕变试验 煤
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