Effect of heat treatment and bedding orientation on the tensile properties of bedded sandstone

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.26.5.477
Xinshuai Shi, Yujing Jiang, H. Jing, Yuanchao Zhang, Yuan Gao, Z. Zhao, Q. Yin
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引用次数: 1

Abstract

The effect of heat treatment and the bedding orientation on the tensile properties, the central strain and failure patterns of bedded sandstone specimens were studied under Brazilian test conditions. The laboratory test results show that the tensile strength decreases with increasing bedding orientation at different temperatures, which indicates the bedded sandstone possesses prominent anisotropy in tensile strength. The anisotropy coefficient first increases and then decreases with the increasing temperature. For all temperatures, both V-strain and S-strain present a decreasing trend with increasing bedding orientation. However, for all bedding orientations, the S-strain first increases and then decreases, but V-strain continues to increase with increasing temperature. Furthermore, the failure patterns of the failed specimens are generally classified into three categories: central across the bedding planes (CF), fracture along the bedding planes (LA) and the mixed fracture patterns of the two. Finally, the evolution of the internal structure of the disk specimens after different heat treatments was investigated by SEM tests. The specimen profile looks smoother and denser at 400oC and 600oC, but at 800oC and 1000oC, the internal structure of the specimen is sharply deteriorated by thermal reactions.
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热处理和层理取向对层理砂岩拉伸性能的影响
在巴西试验条件下,研究了热处理和层理取向对层理砂岩试件拉伸性能、中心应变和破坏模式的影响。室内试验结果表明,不同温度下,层理砂岩抗拉强度随层理取向的增大而减小,表明层理砂岩抗拉强度具有明显的各向异性。各向异性系数随温度的升高先增大后减小。在所有温度下,随着层理方向的增加,v -应变和s -应变均呈减小趋势。各层理方向s应变随温度升高先增大后减小,v应变随温度升高继续增大。破坏试样的破坏模式一般分为中部跨层破坏模式(CF)、沿层理破坏模式(LA)和两种模式的混合破坏模式。最后,通过扫描电镜(SEM)研究了不同热处理后圆盘试样内部组织的演变。在400oC和600oC时,试样轮廓看起来更光滑、致密,但在800oC和1000oC时,试样内部结构因热反应而急剧恶化。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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