Experimental and theoretical study on the compression characteristics of dry/water-saturated sandstone under different deformation rates

被引：0
作者：
Teng Teng
Peng Gong
机构：
[1] China University of Mining and Technology,School of Energy and Mining Engineering
[2] China University of Mining &Technology,State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, School of Science
[3] Colorado School of Mines,Department of Civil and Environmental Engineering
来源：
Arabian Journal of Geosciences | 2020年 / 13卷
关键词：
Rock mechanics; Deformation rate; Dry and water-saturated sandstone; Acoustic emission; Mechanical properties; One-dimensional constitutive model;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Mechanical and acoustic emission (AE) characteristics of dry and water-saturated sandstone under different compression rates were analysed, respectively. Based on the deformation rate enhancing and the moisture softening factors of rock’s elasticity modulus, a one-dimensional constitutive model was proposed and validated by experimental results. Results show that the stress–strain curve of dry sandstone consists of three stages: elasticity, weak plasticity and fracture. Water-saturated sandstone has a relatively long compaction stage, a short elasticity stage and an extended plasticity stage. The compressive strength and elasticity modulus increase as the deformation rate is increased. The strength of water-saturated sandstone is lower than that of dry sandstone, and the difference of rock strength in the two states decreases as increasing deformation rate is increased. The elasticity modulus of water-saturated sandstone is lower than that of dry sandstone. The peak strain of sandstone is not sensitive to the deformation rate, and the peak strain of water-saturated sandstone is 32% higher than that of dry sandstone. The AE energy accumulation increases with the increasing deformation rate, and the energy accumulation of water-saturated sandstone is three to five times that of dry sandstone. The proposed one-dimensional constitutive model can describe the deformation characteristics of dry and water-saturated sandstone under different compression rates.
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[11]  
Fukui K(2012)Experimental study of acoustic emission characteristics of coal samples with different moisture contents in process of compression deformation and failure [J] Chinese Journal of Rock Mechanics and Engineering 31 1115-1120
[12]  
Li HB(2017)Strength behaviour of sandstone subjected to polyaxial state of stress [J] International Journal of Mining Science and Technology 27 889-897
[13]  
Zhao J(1981)Influence of strain rate on dilatancy and strength of Oshima granite under uniaxial compression [J] Journal of Geophysical Research: Solid Earth 86 9299-9311
[14]  
Li TJ(2016)Analysis of energy evolution on gas saturated raw coal under triaxial compression [J] Journal of China University of Mining and Technology 45 663-669
[15]  
Li P(2010)The influence of fabric and water content on selected rock mechanical parameters of travertine, examples from Hungary [J] Engineering Geology 115 237-245
[16]  
Liu J(2006)Influence of water content on the strength of rock [J] Engineering Geology 84 70-74
[17]  
Zhu J(2015)Strain rate effect on the mechanical behaviour of sandstones with different grain sizes [J] Rock Mechanics and Rock Engineering 48 1883-1895
[18]  
Li Y(2003)Statistical damage-softening constitutive model for saturated and unsaturated rock [J] Hydro-Science and Engineering 2 12-17
[19]  
Huang X(2015)Dynamic responses of non-welded and welded rock fractures and implications for P-wave attenuation in a rock mass [J] International Journal of Rock Mechanics and Mining Sciences 100 174-181
[20]  
Qiu Y(2005)Experimental analysis of mechanical effects of loading rates on limestone [J] Chinese Journal of Geotechnical Engineering 27 786-788
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