Pore structure and crack characteristics in high-temperature granite under water-cooling

The changes of porosity and microcracks of high-temperature granite under water-cooling have a great influence on the safety and efficiency of geothermal resources exploitation. To analyze the formation conditions of the pore structure and microcracks of granite specimens at different temperatures u...

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Autores principales:	Xinghui Wu, Qifeng Guo, Yu Zhu, Fenhua Ren, Jie Zhang, Xu Wu, Meifeng Cai
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Geothermal exploitation High-temperature granite NMR Pore structure SEM Crack characteristics Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/8f194804426e40588a27c15d8f412ddd
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id	oai:doaj.org-article:8f194804426e40588a27c15d8f412ddd
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spelling	oai:doaj.org-article:8f194804426e40588a27c15d8f412ddd2021-11-22T04:25:15ZPore structure and crack characteristics in high-temperature granite under water-cooling2214-157X10.1016/j.csite.2021.101646https://doaj.org/article/8f194804426e40588a27c15d8f412ddd2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2214157X21008091https://doaj.org/toc/2214-157XThe changes of porosity and microcracks of high-temperature granite under water-cooling have a great influence on the safety and efficiency of geothermal resources exploitation. To analyze the formation conditions of the pore structure and microcracks of granite specimens at different temperatures under water-cooling, the rock porosity was measured by NMR, and the rock microstructure was observed by PM and SEM. The results show that the closure of microcracks occurs at 150 °C and the grain boundary microcracks appear at 300 °C. And the porosity and pore size begin to increase, the number of pores remains stable, and intracrystalline microcracks appear at 450 °C. When T = 600 °C, macropores and trans-granular microcracks appear inside the rock. When 600 °C < T ≤ 750 °C, the increase rate of porosity decreases, the number of macropores increases, the number of micropores decreases, and the total number of pores increases exponentially. The porosity and the number of macropores increase rapidly, and the aperture of transgranular microcracks increases after T = 750 °C. The change of granite microstructure leads to the decrease of thermal conductivity, which decreases with the increasing temperature. During geothermal exploitation, the thermal conductivity of dry hot rock can be characterized by porosity, and the relationship is K=C + D × Ex.Xinghui WuQifeng GuoYu ZhuFenhua RenJie ZhangXu WuMeifeng CaiElsevierarticleGeothermal exploitationHigh-temperature graniteNMRPore structureSEMCrack characteristicsEngineering (General). Civil engineering (General)TA1-2040ENCase Studies in Thermal Engineering, Vol 28, Iss , Pp 101646- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geothermal exploitation High-temperature granite NMR Pore structure SEM Crack characteristics Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Geothermal exploitation High-temperature granite NMR Pore structure SEM Crack characteristics Engineering (General). Civil engineering (General) TA1-2040 Xinghui Wu Qifeng Guo Yu Zhu Fenhua Ren Jie Zhang Xu Wu Meifeng Cai Pore structure and crack characteristics in high-temperature granite under water-cooling
description	The changes of porosity and microcracks of high-temperature granite under water-cooling have a great influence on the safety and efficiency of geothermal resources exploitation. To analyze the formation conditions of the pore structure and microcracks of granite specimens at different temperatures under water-cooling, the rock porosity was measured by NMR, and the rock microstructure was observed by PM and SEM. The results show that the closure of microcracks occurs at 150 °C and the grain boundary microcracks appear at 300 °C. And the porosity and pore size begin to increase, the number of pores remains stable, and intracrystalline microcracks appear at 450 °C. When T = 600 °C, macropores and trans-granular microcracks appear inside the rock. When 600 °C < T ≤ 750 °C, the increase rate of porosity decreases, the number of macropores increases, the number of micropores decreases, and the total number of pores increases exponentially. The porosity and the number of macropores increase rapidly, and the aperture of transgranular microcracks increases after T = 750 °C. The change of granite microstructure leads to the decrease of thermal conductivity, which decreases with the increasing temperature. During geothermal exploitation, the thermal conductivity of dry hot rock can be characterized by porosity, and the relationship is K=C + D × Ex.
format	article
author	Xinghui Wu Qifeng Guo Yu Zhu Fenhua Ren Jie Zhang Xu Wu Meifeng Cai
author_facet	Xinghui Wu Qifeng Guo Yu Zhu Fenhua Ren Jie Zhang Xu Wu Meifeng Cai
author_sort	Xinghui Wu
title	Pore structure and crack characteristics in high-temperature granite under water-cooling
title_short	Pore structure and crack characteristics in high-temperature granite under water-cooling
title_full	Pore structure and crack characteristics in high-temperature granite under water-cooling
title_fullStr	Pore structure and crack characteristics in high-temperature granite under water-cooling
title_full_unstemmed	Pore structure and crack characteristics in high-temperature granite under water-cooling
title_sort	pore structure and crack characteristics in high-temperature granite under water-cooling
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/8f194804426e40588a27c15d8f412ddd
work_keys_str_mv	AT xinghuiwu porestructureandcrackcharacteristicsinhightemperaturegraniteunderwatercooling AT qifengguo porestructureandcrackcharacteristicsinhightemperaturegraniteunderwatercooling AT yuzhu porestructureandcrackcharacteristicsinhightemperaturegraniteunderwatercooling AT fenhuaren porestructureandcrackcharacteristicsinhightemperaturegraniteunderwatercooling AT jiezhang porestructureandcrackcharacteristicsinhightemperaturegraniteunderwatercooling AT xuwu porestructureandcrackcharacteristicsinhightemperaturegraniteunderwatercooling AT meifengcai porestructureandcrackcharacteristicsinhightemperaturegraniteunderwatercooling
_version_	1718418235767914496

Pore structure and crack characteristics in high-temperature granite under water-cooling

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