Creep characteristics of coal and rock investigated by nanoindentation

查看全文 作　　者：Changlun [1]Sun;Guichen [1]Li;Mohamed Elgharib [1,2]Gomah;Jiahui [1]Xu;Yuantian [1]Sun

机构地区：[1]School of Mines,Key Laboratory of Deep Coal Resource Mining,Ministry of Education of China,China University of Mining and Technology,Xuzhou 221116,China;[2]Mining and Petroleum Engineering Department,Faculty of Engineering,Al-Azhar University,Cairo 11435,Egypt

出　　处：《International Journal of Mining Science and Technology》索引2020年第30卷第6期,共8页

基　　金：the projects of the Fundamental Research Funds for the Central Universities(2020ZDPY0221);the Guizhou Science and Technology Department([2020]2Y026)。 摘　　要：In coal mining industry,with the depth growing of coal mines,the creep behaviours of coal and rock can extensively affect the mining safety,coalbed methane recovery and geo-sequestration.To acquire a better insight into their creep characteristics,an efficient and robust researching technique,nanoindentation,was applied to investigate the creep performances of coal and rock samples obtained from two coal mines in the east of China.Creep characteristics were reflected by evaluating the curves of creep depth versus creep time of nanoindentation tests during the load-holding period at the peak load of 30 mN.These curves can be divided into two stages:transient stage and steady stage;and the time of load-holding period of 5 s,which is the dividing point between two stages,can efficiently avoid the influence of creep displacement on the unloading curves.The exponential function can perfectly fit creep curves and Kelvin model can be used to calculate the rheological parameters of coal and rock samples.Calculated results yield values for the creep modulus and viscosity terms of coal and rock.This study also settled a particular emphasis on the selection of the positions of indentations to obtain the rheological properties of mineralogical constituents in heterogonous coal and rock samples and their elastic aftereffect. 关键词：Coal and rock NANOINDENTATION CREEP Heterogeneous properties Elastic aftereffect

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Creep characteristics of coal and rock investigated by nanoindentation

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