Study on the Strength Properties and Micromechanisms of Nano-Al 2 O 3 -Modified Predisintegrated Carbonaceous Mudstone Based on Orthogonal Design

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-07-05 DOI:10.1144/qjegh2023-018
Hong-yuan Fu, Xiao Yu, Jie Liu, Ling Zeng, Xiao-wei Chen
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Abstract

This study aims to improve the mechanical properties of predisintegrated carbonaceous mudstone (PCM) used as an embankment fill. The four factors used in the orthogonal design test are nano-Al 2 O 3 content, cement content, water content and compaction. Afterward, the strength characteristics and micromechanisms of PCM modified by nano-Al 2 O 3 and cement are studied through triaxial compression tests, X-ray diffraction analysis and SEM observations. The results show that the failure mode of PCM changes from bulging failure to shear failure when the nano-Al 2 O 3 and cement contents are increased. The order in which the factors affected the cohesion of PCM is cement content, nano-Al 2 O 3 content, water content and compaction. At a given cement content, the cohesion of PCM with an optimal compaction of 96% and a water content of 8% increases and then decreases with increasing nano-Al 2 O 3 content. The increase in the internal friction angle is proportional to the nano-Al 2 O 3 content when the cement content is between 0 and 4%. Controlling the contents of nano-Al 2 O 3 and cement to 0.3% and 8% results in a synergistic effect of both materials on shear strength. Nano-Al 2 O 3 improves the cohesion and friction strength of PCM through accelerating the hydration of cement and optimizing the structure of hydration products.
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基于正交设计的纳米al2o3改性预崩解碳质泥岩强度特性及微观机理研究
本研究旨在改善预崩解碳质泥岩(PCM)作为路堤填料的力学性能。正交设计试验采用纳米al2o3含量、水泥含量、含水量和压实度四个因素。随后,通过三轴压缩试验、x射线衍射分析和扫描电镜观察,研究了纳米al2o3和水泥改性PCM的强度特性和微观机理。结果表明:随着纳米al2o3和水泥掺量的增加,PCM的破坏模式由胀形破坏转变为剪切破坏;影响PCM黏聚力的因素依次为水泥掺量、纳米al2o3掺量、含水量和压实度。在水泥掺量一定的情况下,随着纳米al2o3掺量的增加,最优压实度为96%、含水量为8%的PCM的黏聚力先增大后减小。当水泥掺量在0 ~ 4%之间时,内摩擦角的增大与纳米al2o3掺量成正比。将纳米al2o3和水泥的掺量分别控制在0.3%和8%,两种材料的抗剪强度具有协同效应。纳米al2o3通过加速水泥的水化和优化水化产物的结构,提高了PCM的黏聚力和摩擦强度。
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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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