Experiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents

Freezing-thawing cycles seriously affect the safety of underground engineering in cold regions. At present, most research studies focus on the effect of number and freezing temperature on freezing-thawing cycles. As another important factor, the mechanism of rock mass water content affecting freezin...

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Autores principales:	Guilei Song, Longxiao Chen, Kesheng Li, Deng Zhang, Junhao Xu, Wenshuo Xu, Chuanxiao Liu, Jinpeng Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/c502c5e160e64935a90025992d942c57
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spelling	oai:doaj.org-article:c502c5e160e64935a90025992d942c572021-11-29T00:56:14ZExperiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents1875-920310.1155/2021/2280348https://doaj.org/article/c502c5e160e64935a90025992d942c572021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/2280348https://doaj.org/toc/1875-9203Freezing-thawing cycles seriously affect the safety of underground engineering in cold regions. At present, most research studies focus on the effect of number and freezing temperature on freezing-thawing cycles. As another important factor, the mechanism of rock mass water content affecting freezing-thawing is less studied. This paper studied the influence of the water content on mechanical property, microstructure, and acoustic emission characteristics of sandstone. The results indicated that the uniaxial compressive strength (UCS) and elastic modulus (E) of sandstone after 20 freezing-thawing cycles decreased as the water content increased. However, the decreasing rate of UCS gradually decreased, while the decreasing rate of E gradually increased. Furthermore, the empirical formulas of UCS and E about water content were obtained. The porosity and plasticity of sandstone after 20 freezing-thawing cycles increased as the water content increased. The empirical formulas of UCS and E about water content were obtained. The porosity and plasticity of sandstone after 20 freezing-thawing cycles increased as the water content increased. The decreasing trend of UCS with porosity was the same as that of UCS with water content. The failure form of sandstone gradually changed from splitting failure to shear failure. The results of the acoustic emission test showed that the stress-strain curves combined with acoustic emission ring counting could reveal the damage evolution process of sandstone during loading.Guilei SongLongxiao ChenKesheng LiDeng ZhangJunhao XuWenshuo XuChuanxiao LiuJinpeng ZhangHindawi LimitedarticlePhysicsQC1-999ENShock and Vibration, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Guilei Song Longxiao Chen Kesheng Li Deng Zhang Junhao Xu Wenshuo Xu Chuanxiao Liu Jinpeng Zhang Experiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents
description	Freezing-thawing cycles seriously affect the safety of underground engineering in cold regions. At present, most research studies focus on the effect of number and freezing temperature on freezing-thawing cycles. As another important factor, the mechanism of rock mass water content affecting freezing-thawing is less studied. This paper studied the influence of the water content on mechanical property, microstructure, and acoustic emission characteristics of sandstone. The results indicated that the uniaxial compressive strength (UCS) and elastic modulus (E) of sandstone after 20 freezing-thawing cycles decreased as the water content increased. However, the decreasing rate of UCS gradually decreased, while the decreasing rate of E gradually increased. Furthermore, the empirical formulas of UCS and E about water content were obtained. The porosity and plasticity of sandstone after 20 freezing-thawing cycles increased as the water content increased. The empirical formulas of UCS and E about water content were obtained. The porosity and plasticity of sandstone after 20 freezing-thawing cycles increased as the water content increased. The decreasing trend of UCS with porosity was the same as that of UCS with water content. The failure form of sandstone gradually changed from splitting failure to shear failure. The results of the acoustic emission test showed that the stress-strain curves combined with acoustic emission ring counting could reveal the damage evolution process of sandstone during loading.
format	article
author	Guilei Song Longxiao Chen Kesheng Li Deng Zhang Junhao Xu Wenshuo Xu Chuanxiao Liu Jinpeng Zhang
author_facet	Guilei Song Longxiao Chen Kesheng Li Deng Zhang Junhao Xu Wenshuo Xu Chuanxiao Liu Jinpeng Zhang
author_sort	Guilei Song
title	Experiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents
title_short	Experiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents
title_full	Experiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents
title_fullStr	Experiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents
title_full_unstemmed	Experiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents
title_sort	experiment and mechanism investigation on freezing-thawing of sandstone with different water contents
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/c502c5e160e64935a90025992d942c57
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Experiment and Mechanism Investigation on Freezing-Thawing of Sandstone with Different Water Contents

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