Swelling Damage Evolution of Argillaceous Slate in a Water-Rich Environment

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-08-14 DOI:10.1144/qjegh2022-128
Q. Zuo, Pan Li, Xinyi Li, Fubang Chen
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Abstract

The swelling of rock is a key issue in engineering. With large infrastructure construction trending toward complex geological conditions, an increasing number of projects could suffer from soft rock swelling. To solve this problem, an understanding of the damage evolution during the swelling process is essential. Argillaceous slate is a typical metamorphic rock and shows strong swelling characteristics in a water-rich environment due to its abundance of hydrophilic minerals. In this paper, argillaceous slate was selected as the research object. The damage evolution of argillaceous slate during swelling was explored via laboratory tests including swelling characteristic tests, soft rock needle penetration tests, and scanning electron microscope tests and damage theory. The research findings reveal that the slate swelling process in a water-rich environment could be divided into three stages. The swelling rate was relatively high in the early stage of the tests, slowed over time, and finally stabilized. However, the argillaceous slate strength decreased rapidly in the early stage, and the degradation rate was generally slow in the later stage. After water absorption, the clay mineral particles began to expand, and the microscopic structure of the argillaceous slate became complicated. The pore area increased, and the pore diameter decreased. A low degree of microscopic damage induced a high degree of macroscopic mechanical degradation. Additionally, the damage mechanism of argillaceous slate during swelling was discussed from micro- and macroscopic perspectives. A relationship between macroscopic mechanical degradation and microscopic damage to argillaceous slate was established, which can provide theoretical support for further research on soft rock swelling characteristics: The microscopic damage drove the macroscopic mechanical degradation.
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富水环境下泥质板岩的膨胀损伤演化
岩石膨胀是工程中的一个关键问题。随着大型基础设施建设向复杂地质条件发展,出现软岩膨胀的工程越来越多。为了解决这个问题,了解膨胀过程中的损伤演变是必不可少的。泥质板岩是一种典型的变质岩,富含亲水性矿物,在富水环境中表现出强烈的溶胀特征。本文以泥质板岩为研究对象。通过膨胀特征试验、软岩针刺试验、扫描电镜试验和损伤理论等室内试验,探讨泥质板岩在膨胀过程中的损伤演化规律。研究结果表明,富水环境下板岩溶胀过程可分为3个阶段。试验初期肿胀率较高,随着时间的推移逐渐减缓,最终趋于稳定。但泥质板岩强度在早期迅速下降,后期降解速率普遍较慢。粘土矿物颗粒吸水后开始膨胀,泥质板岩微观结构变得复杂。孔隙面积增大,孔径减小。低程度的微观损伤导致了高程度的宏观力学退化。并从微观和宏观两方面探讨了泥质板岩在膨胀过程中的损伤机理。建立了泥质板岩宏观力学退化与细观损伤之间的关系,为进一步研究软岩膨胀特征提供了理论支持:细观损伤驱动宏观力学退化;
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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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