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...
Main Authors: | , , , |
---|---|
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 |
id |
doaj-2822a7b147e4489093ce4cddce877e9b |
---|---|
record_format |
Article |
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 |
_version_ |
1724920073300213760 |