{"title":"温度对红砂岩物理力学性能影响的实验研究","authors":"Yun Wu, Longxiang Deng, Zhen Huang, Li-Ning Yang","doi":"10.1144/qjegh2021-086","DOIUrl":null,"url":null,"abstract":"With the rapid development of transportation in China, the number of tunnels, as the main control project, is also increasing. However, tunnels may suffer from fire accidents during operation, and the surrounding rock of tunnels will be irreparably damaged by high temperature. To investigate the influence of temperature on the physical and mechanical properties of red sandstone, physical properties as well as Brazilian splitting test were conducted on red sandstone after thermal treatment from 25 ℃ to 600 ℃. The results show that with the increasing temperature, the apparent color of red sandstone is gradually deepened. The P-wave velocity and Leeb hardness decreased with the increase of temperature, and typical temperature threshold (300 ℃) was identified. The tensile strength of red sandstone decreasing quickly from 25 ℃ to 300 ℃ and then decreases slowly from 300 ℃ to 600 ℃. The acoustic emission (AE) signal has a high degree of consistency with the stress time curve. As the temperature increased, the AE became more active, when red sandstone is near to failure, the AE signal increases sharply. The failure mode of sandstone is mainly composed of a through main crack and a secondary crack, and the crack width also grows gradually. Moreover, we observe that the number of fractures in the sandstone also increase as the temperature rise by polarized light microscopy images. The variation of physical and mechanical properties of red sandstone is closely related to microstructure. These findings demonstrate that temperature has an obvious weakening effect on the physical and mechanical properties of sandstone, and provide theoretical guidance and engineering significance for tunnel fire restoration.\n \n Thematic collection:\n This article is part of the Engineering Geology and Hydrogeology of the Anthropocene collection available at:\n https://www.lyellcollection.org/topic/collections/engineering-geology-and-hydrogeology-of-the-anthropocene\n","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":null,"pages":null},"PeriodicalIF":1.3000,"publicationDate":"2023-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental investigation of temperature on the physical and mechanical properties of red sandstone\",\"authors\":\"Yun Wu, Longxiang Deng, Zhen Huang, Li-Ning Yang\",\"doi\":\"10.1144/qjegh2021-086\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"With the rapid development of transportation in China, the number of tunnels, as the main control project, is also increasing. However, tunnels may suffer from fire accidents during operation, and the surrounding rock of tunnels will be irreparably damaged by high temperature. To investigate the influence of temperature on the physical and mechanical properties of red sandstone, physical properties as well as Brazilian splitting test were conducted on red sandstone after thermal treatment from 25 ℃ to 600 ℃. The results show that with the increasing temperature, the apparent color of red sandstone is gradually deepened. The P-wave velocity and Leeb hardness decreased with the increase of temperature, and typical temperature threshold (300 ℃) was identified. The tensile strength of red sandstone decreasing quickly from 25 ℃ to 300 ℃ and then decreases slowly from 300 ℃ to 600 ℃. The acoustic emission (AE) signal has a high degree of consistency with the stress time curve. As the temperature increased, the AE became more active, when red sandstone is near to failure, the AE signal increases sharply. The failure mode of sandstone is mainly composed of a through main crack and a secondary crack, and the crack width also grows gradually. Moreover, we observe that the number of fractures in the sandstone also increase as the temperature rise by polarized light microscopy images. The variation of physical and mechanical properties of red sandstone is closely related to microstructure. These findings demonstrate that temperature has an obvious weakening effect on the physical and mechanical properties of sandstone, and provide theoretical guidance and engineering significance for tunnel fire restoration.\\n \\n Thematic collection:\\n This article is part of the Engineering Geology and Hydrogeology of the Anthropocene collection available at:\\n https://www.lyellcollection.org/topic/collections/engineering-geology-and-hydrogeology-of-the-anthropocene\\n\",\"PeriodicalId\":20937,\"journal\":{\"name\":\"Quarterly Journal of Engineering Geology and Hydrogeology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.3000,\"publicationDate\":\"2023-03-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Quarterly Journal of Engineering Geology and Hydrogeology\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1144/qjegh2021-086\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, GEOLOGICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Quarterly Journal of Engineering Geology and Hydrogeology","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/qjegh2021-086","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
Experimental investigation of temperature on the physical and mechanical properties of red sandstone
With the rapid development of transportation in China, the number of tunnels, as the main control project, is also increasing. However, tunnels may suffer from fire accidents during operation, and the surrounding rock of tunnels will be irreparably damaged by high temperature. To investigate the influence of temperature on the physical and mechanical properties of red sandstone, physical properties as well as Brazilian splitting test were conducted on red sandstone after thermal treatment from 25 ℃ to 600 ℃. The results show that with the increasing temperature, the apparent color of red sandstone is gradually deepened. The P-wave velocity and Leeb hardness decreased with the increase of temperature, and typical temperature threshold (300 ℃) was identified. The tensile strength of red sandstone decreasing quickly from 25 ℃ to 300 ℃ and then decreases slowly from 300 ℃ to 600 ℃. The acoustic emission (AE) signal has a high degree of consistency with the stress time curve. As the temperature increased, the AE became more active, when red sandstone is near to failure, the AE signal increases sharply. The failure mode of sandstone is mainly composed of a through main crack and a secondary crack, and the crack width also grows gradually. Moreover, we observe that the number of fractures in the sandstone also increase as the temperature rise by polarized light microscopy images. The variation of physical and mechanical properties of red sandstone is closely related to microstructure. These findings demonstrate that temperature has an obvious weakening effect on the physical and mechanical properties of sandstone, and provide theoretical guidance and engineering significance for tunnel fire restoration.
Thematic collection:
This article is part of the Engineering Geology and Hydrogeology of the Anthropocene collection available at:
https://www.lyellcollection.org/topic/collections/engineering-geology-and-hydrogeology-of-the-anthropocene
期刊介绍:
Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House.
Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards.
The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.