Dynamic Characteristics of Sandstone under Coupled Static-Dynamic Loads after Freeze-Thaw Cycles

The effect of temperature fluctuation on rocks needs to be considered in many civil engineering applications. Up to date the dynamic characteristics of rock under freeze-thaw cycles are still not quite clearly understood. In this study, the dynamic mechanical properties of sandstone under pre-compre...

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Main Authors: Bo Ke, Jian Zhang, Hongwei Deng, Xiangru Yang
Format: Article
Language:English
Published: MDPI AG 2020-05-01
Series:Applied Sciences
Subjects:
Online Access:https://www.mdpi.com/2076-3417/10/10/3351
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spelling doaj-2822a7b147e4489093ce4cddce877e9b2020-11-25T02:10:13ZengMDPI AGApplied Sciences2076-34172020-05-01103351335110.3390/app10103351Dynamic Characteristics of Sandstone under Coupled Static-Dynamic Loads after Freeze-Thaw CyclesBo Ke0Jian Zhang1Hongwei Deng2Xiangru Yang3Key Laboratory of Mineral Resources Processing and Environment of Hubei Province, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaThe effect of temperature fluctuation on rocks needs to be considered in many civil engineering applications. Up to date the dynamic characteristics of rock under freeze-thaw cycles are still not quite clearly understood. In this study, the dynamic mechanical properties of sandstone under pre-compression stress and freeze-thaw cycles were investigated. At the same number of freeze-thaw cycles, with increasing axial pre-compression stress, the dynamic Young’s modulus and peak stress first increase and then decrease, whereas the dynamic peak strain first decreases and then increases. At the same pre-compression stress, with increasing number of freeze-thaw cycles, the peak stress decreases while the peak strain increases, and the peak strain and peak stress show an inverse correlation before or after the pre-compression stress reaches the densification load of the static stress–strain curve. The peak stress and strain both increase under the static load near the yielding stage threshold of the static stress–strain curve. The failure mode is mainly shear failure, and with increasing axial pre-compression stress, the degree of shear failure increases, the energy absorption rate of the specimen increases first and then decreases. With increasing number of freeze-thaw cycles, the number of fragments increases and the size diminishes, and the energy absorption rates of the sandstone increase.https://www.mdpi.com/2076-3417/10/10/3351freeze-thaw cyclessplit Hopkinson Pressure Barstatic-dynamic loadsrock dynamic mechanicsfailure modeenergy absorption
collection DOAJ
language English
format Article
sources DOAJ
author Bo Ke
Jian Zhang
Hongwei Deng
Xiangru Yang
spellingShingle Bo Ke
Jian Zhang
Hongwei Deng
Xiangru Yang
Dynamic Characteristics of Sandstone under Coupled Static-Dynamic Loads after Freeze-Thaw Cycles
Applied Sciences
freeze-thaw cycles
split Hopkinson Pressure Bar
static-dynamic loads
rock dynamic mechanics
failure mode
energy absorption
author_facet Bo Ke
Jian Zhang
Hongwei Deng
Xiangru Yang
author_sort Bo Ke
title Dynamic Characteristics of Sandstone under Coupled Static-Dynamic Loads after Freeze-Thaw Cycles
title_short Dynamic Characteristics of Sandstone under Coupled Static-Dynamic Loads after Freeze-Thaw Cycles
title_full Dynamic Characteristics of Sandstone under Coupled Static-Dynamic Loads after Freeze-Thaw Cycles
title_fullStr Dynamic Characteristics of Sandstone under Coupled Static-Dynamic Loads after Freeze-Thaw Cycles
title_full_unstemmed Dynamic Characteristics of Sandstone under Coupled Static-Dynamic Loads after Freeze-Thaw Cycles
title_sort dynamic characteristics of sandstone under coupled static-dynamic loads after freeze-thaw cycles
publisher MDPI AG
series Applied Sciences
issn 2076-3417
publishDate 2020-05-01
description The effect of temperature fluctuation on rocks needs to be considered in many civil engineering applications. Up to date the dynamic characteristics of rock under freeze-thaw cycles are still not quite clearly understood. In this study, the dynamic mechanical properties of sandstone under pre-compression stress and freeze-thaw cycles were investigated. At the same number of freeze-thaw cycles, with increasing axial pre-compression stress, the dynamic Young’s modulus and peak stress first increase and then decrease, whereas the dynamic peak strain first decreases and then increases. At the same pre-compression stress, with increasing number of freeze-thaw cycles, the peak stress decreases while the peak strain increases, and the peak strain and peak stress show an inverse correlation before or after the pre-compression stress reaches the densification load of the static stress–strain curve. The peak stress and strain both increase under the static load near the yielding stage threshold of the static stress–strain curve. The failure mode is mainly shear failure, and with increasing axial pre-compression stress, the degree of shear failure increases, the energy absorption rate of the specimen increases first and then decreases. With increasing number of freeze-thaw cycles, the number of fragments increases and the size diminishes, and the energy absorption rates of the sandstone increase.
topic freeze-thaw cycles
split Hopkinson Pressure Bar
static-dynamic loads
rock dynamic mechanics
failure mode
energy absorption
url https://www.mdpi.com/2076-3417/10/10/3351
work_keys_str_mv AT boke dynamiccharacteristicsofsandstoneundercoupledstaticdynamicloadsafterfreezethawcycles
AT jianzhang dynamiccharacteristicsofsandstoneundercoupledstaticdynamicloadsafterfreezethawcycles
AT hongweideng dynamiccharacteristicsofsandstoneundercoupledstaticdynamicloadsafterfreezethawcycles
AT xiangruyang dynamiccharacteristicsofsandstoneundercoupledstaticdynamicloadsafterfreezethawcycles
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