Investigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions

Due to the extensive excavation of the mine pit, a special frozen rock slope is formed, which transforms the permafrost (coal rock) of certain thickness in the frozen state to the melting state. To evaluate the dynamic mechanical properties and deformation characteristics of coal under cyclic freeze...

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Autores principales:	Shuang Gong, Wen Wang, Furui Xi, Wenlong Shen
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/84fcdbc285684f25839fd5c023200ea1
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spelling	oai:doaj.org-article:84fcdbc285684f25839fd5c023200ea12021-11-08T02:35:53ZInvestigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions1468-812310.1155/2021/8602301https://doaj.org/article/84fcdbc285684f25839fd5c023200ea12021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/8602301https://doaj.org/toc/1468-8123Due to the extensive excavation of the mine pit, a special frozen rock slope is formed, which transforms the permafrost (coal rock) of certain thickness in the frozen state to the melting state. To evaluate the dynamic mechanical properties and deformation characteristics of coal under cyclic freeze-thaw conditions, freeze-thaw experiments with different cycle times were conducted. And the mechanical properties of coal under quasistatic and dynamic conditions were investigated by using GCTS multifunctional rock mechanic experimental apparatus and SHPB dynamic loading apparatus, respectively. The results show that with the increase of freeze-thawing times, mass of both water-saturated and dried coal samples gradually decreased, the postpeak becomes gentler, and the specimens show ductile damage characteristics. The damage of the coal samples changed more after 30 freeze-thaw cycles, when deterioration of the coal samples was highest. The elastic modulus of the coal sample after freeze-thawing decreases continuously with the increase of the number of freeze-thaw cycles, and its trend decreases approximately linearly. Dynamic compressive strength of the coal samples decreases after freeze-thaw cycles, and this trend is consistent with the quasistatic loading conditions.Shuang GongWen WangFurui XiWenlong ShenHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Shuang Gong Wen Wang Furui Xi Wenlong Shen Investigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions
description	Due to the extensive excavation of the mine pit, a special frozen rock slope is formed, which transforms the permafrost (coal rock) of certain thickness in the frozen state to the melting state. To evaluate the dynamic mechanical properties and deformation characteristics of coal under cyclic freeze-thaw conditions, freeze-thaw experiments with different cycle times were conducted. And the mechanical properties of coal under quasistatic and dynamic conditions were investigated by using GCTS multifunctional rock mechanic experimental apparatus and SHPB dynamic loading apparatus, respectively. The results show that with the increase of freeze-thawing times, mass of both water-saturated and dried coal samples gradually decreased, the postpeak becomes gentler, and the specimens show ductile damage characteristics. The damage of the coal samples changed more after 30 freeze-thaw cycles, when deterioration of the coal samples was highest. The elastic modulus of the coal sample after freeze-thawing decreases continuously with the increase of the number of freeze-thaw cycles, and its trend decreases approximately linearly. Dynamic compressive strength of the coal samples decreases after freeze-thaw cycles, and this trend is consistent with the quasistatic loading conditions.
format	article
author	Shuang Gong Wen Wang Furui Xi Wenlong Shen
author_facet	Shuang Gong Wen Wang Furui Xi Wenlong Shen
author_sort	Shuang Gong
title	Investigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions
title_short	Investigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions
title_full	Investigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions
title_fullStr	Investigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions
title_full_unstemmed	Investigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions
title_sort	investigation of dynamic mechanical properties of coal after freeze-thaw cyclic conditions
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/84fcdbc285684f25839fd5c023200ea1
work_keys_str_mv	AT shuanggong investigationofdynamicmechanicalpropertiesofcoalafterfreezethawcyclicconditions AT wenwang investigationofdynamicmechanicalpropertiesofcoalafterfreezethawcyclicconditions AT furuixi investigationofdynamicmechanicalpropertiesofcoalafterfreezethawcyclicconditions AT wenlongshen investigationofdynamicmechanicalpropertiesofcoalafterfreezethawcyclicconditions
_version_	1718443201480622080

Investigation of Dynamic Mechanical Properties of Coal after Freeze-Thaw Cyclic Conditions

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