温度对红砂岩物理力学性能影响的实验研究

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-03-22 DOI:10.1144/qjegh2021-086
Yun Wu, Longxiang Deng, Zhen Huang, Li-Ning Yang
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引用次数: 0

摘要

随着中国交通运输的快速发展,隧道作为主要控制工程的数量也在不断增加。然而,隧道在运行过程中可能会发生火灾事故,高温会对隧道围岩造成不可挽回的破坏。为研究温度对红砂岩物理力学性能的影响,对25℃~ 600℃热处理后的红砂岩进行了物理性能试验和巴西劈裂试验。结果表明:随着温度的升高,红砂岩的表观颜色逐渐加深;纵波速度和Leeb硬度随温度升高而降低,并确定了典型的温度阈值(300℃)。红砂岩的抗拉强度在25℃~ 300℃范围内迅速下降,在300℃~ 600℃范围内下降缓慢。声发射信号与应力时间曲线具有高度的一致性。随着温度的升高,声发射信号变得更加活跃,当红砂岩接近破坏时,声发射信号急剧增加。砂岩的破坏模式主要由贯通的主裂缝和次生裂缝组成,裂缝宽度也逐渐增大。此外,通过偏振光显微镜观察,砂岩中的裂缝数量也随着温度的升高而增加。红砂岩物理力学性能的变化与微观结构密切相关。研究结果表明,温度对砂岩的物理力学性能有明显的减弱作用,为隧道火灾恢复提供了理论指导和工程意义。专题收藏:本文是人类世工程地质学和水文地质学收藏的一部分,可在:https://www.lyellcollection.org/topic/collections/engineering-geology-and-hydrogeology-of-the-anthropocene
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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
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
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.
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