Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles

Based on the sandstone from the slope of Baorixile open-pit mining area in Hulunbuir City, Inner Mongolia, the dynamic uniaxial compression test of sandstone with different freeze-thaw cycles has been carried out by Split Hopkinson Pressure Bar test (SHPB). The test results show that the crushing de...

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Autores principales:	Ke Man, Zongxu Liu, Zhifei Song, Xiaoli Liu
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/a4907e36ac254b26bfdeddc3b0fdbed2
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spelling	oai:doaj.org-article:a4907e36ac254b26bfdeddc3b0fdbed22021-11-22T01:11:20ZDynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles1468-812310.1155/2021/7724455https://doaj.org/article/a4907e36ac254b26bfdeddc3b0fdbed22021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/7724455https://doaj.org/toc/1468-8123Based on the sandstone from the slope of Baorixile open-pit mining area in Hulunbuir City, Inner Mongolia, the dynamic uniaxial compression test of sandstone with different freeze-thaw cycles has been carried out by Split Hopkinson Pressure Bar test (SHPB). The test results show that the crushing degree of sandstone becomes serious with the freeze-thaw cycle times and strain rate increases. The dynamic compressive strength increases with the raise of strain rate under the same freeze-thaw cycles, while it reduces with the increases of freeze-thaw cycles at the same strain rate. It is found that the 10 freeze-thaw cycles are an obvious inflection point. When it is less than 10 cycles, the dynamic compressive strength of sandstone specimens decreases rapidly, it is more than 10 cycles, and the strength decreases gradually. This is due to that the evolution progress of pores in sandstone is more uniform after a certain number of freeze-thaw cycles. Meantime, the effect of freezing and thawing is mostly restrained by the pore evolution. On the other hand, the dissipated energy required for sandstone failure grows up with the increase of the number of freeze-thaw cycles. It shows that more energy is needed for the engender of pores and fractures in sandstone caused by freeze-thaw cycle. This led to the deterioration of sandstone structural stability and the decrease of dynamic mechanical properties.Ke ManZongxu LiuZhifei SongXiaoli LiuHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Ke Man Zongxu Liu Zhifei Song Xiaoli Liu Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles
description	Based on the sandstone from the slope of Baorixile open-pit mining area in Hulunbuir City, Inner Mongolia, the dynamic uniaxial compression test of sandstone with different freeze-thaw cycles has been carried out by Split Hopkinson Pressure Bar test (SHPB). The test results show that the crushing degree of sandstone becomes serious with the freeze-thaw cycle times and strain rate increases. The dynamic compressive strength increases with the raise of strain rate under the same freeze-thaw cycles, while it reduces with the increases of freeze-thaw cycles at the same strain rate. It is found that the 10 freeze-thaw cycles are an obvious inflection point. When it is less than 10 cycles, the dynamic compressive strength of sandstone specimens decreases rapidly, it is more than 10 cycles, and the strength decreases gradually. This is due to that the evolution progress of pores in sandstone is more uniform after a certain number of freeze-thaw cycles. Meantime, the effect of freezing and thawing is mostly restrained by the pore evolution. On the other hand, the dissipated energy required for sandstone failure grows up with the increase of the number of freeze-thaw cycles. It shows that more energy is needed for the engender of pores and fractures in sandstone caused by freeze-thaw cycle. This led to the deterioration of sandstone structural stability and the decrease of dynamic mechanical properties.
format	article
author	Ke Man Zongxu Liu Zhifei Song Xiaoli Liu
author_facet	Ke Man Zongxu Liu Zhifei Song Xiaoli Liu
author_sort	Ke Man
title	Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles
title_short	Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles
title_full	Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles
title_fullStr	Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles
title_full_unstemmed	Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles
title_sort	dynamic mechanical response and dissipated energy analysis of sandstone under freeze-thaw cycles
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/a4907e36ac254b26bfdeddc3b0fdbed2
work_keys_str_mv	AT keman dynamicmechanicalresponseanddissipatedenergyanalysisofsandstoneunderfreezethawcycles AT zongxuliu dynamicmechanicalresponseanddissipatedenergyanalysisofsandstoneunderfreezethawcycles AT zhifeisong dynamicmechanicalresponseanddissipatedenergyanalysisofsandstoneunderfreezethawcycles AT xiaoliliu dynamicmechanicalresponseanddissipatedenergyanalysisofsandstoneunderfreezethawcycles
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Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles

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