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IF 3.1 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2024-12-09 DOI:10.3390/ma17236018

Qiunan Chen, Xiaodi Xu, Ao Zeng, Yunyang Yan, Yan Feng, Kun Long, Chenna Qi

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引用次数: 0

摘要

对中国广东（GD）疏浚填土的研究对填海工程具有重要意义。目前，对广东地区疏浚填土的研究相对较少，而通过填海造地形成的疏浚填土地基与天然地基在工程特性上存在诸多差异。为了更全面地了解广东沿海地区吹填土的物理力学性质，了解其长期蠕变行对建筑物长期沉降和变形的影响，需要对其材料性质、微观结构、元素组成、三轴剪切力等进行研究、通过室内土工试验、扫描电子显微镜（SEM）、X 射线衍射（XRD）、常规三轴剪切试验和三轴蠕变试验，对广东疏浚填土的材料性能、微观结构、元素组成、三轴剪切性能和三轴蠕变性能进行了研究和分析。试验结果表明，广东疏浚填料具有高含水率、高孔隙比、高液限粘砂的特点，矿物成分以石英和白云石为主。扫描电镜结果表明，疏浚填土的颗粒呈现团聚形态，试验土样表面有鳞片状细小薄片，结构破碎。在三轴剪切试验中，广东疏浚填土表现出应变硬化特征，有效应力路径表现出连续加载特征；固结不排水剪切试验表明，广东疏浚填土在低围压条件下具有剪切膨胀特征。研究发现，随着偏应力的增加，在相同周压条件下，固结不排水三轴蠕变试验的轴向应变逐渐超过固结排水三轴蠕变试验的轴向应变。该研究结果对于进一步了解该地区淤泥质土的力学性质以及在实际工程设计中合理选择土体强度参数具有重要的理论和实践意义。

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Study on the Macro-/Micrometric Characteristics and Mechanical Properties of Clayey Sandy Dredged Fill in the Guangdong Area.

The study of dredged fill in Guangdong (GD), China, is of great significance for reclamation projects. Currently, there are relatively few studies on dredged fill in Guangdong, and there are many differences in the engineering characteristics of dredged fill foundations formed through land reclamation and natural foundations. In order to have a more comprehensive understanding of the physico-mechanical properties of blowing fill in the coastal area of GD and to understand the effect of its long-term creep row on the long-term settlement and deformation of buildings, the material properties, microstructure, elemental composition, triaxial shear properties, and triaxial creep properties of dredged fill in Guangdong were studied and analyzed through indoor geotechnical tests, scanning electron microscopy (SEM), X-ray diffraction (XRD), and conventional triaxial shear tests and triaxial creep tests. The test results showed that the Guangdong dredged fill is characterized by a high water content, high pore ratio, and high-liquid-limit clayey sand, and the mineral composition is dominated by quartz and whitmoreite. The scanning electron microscopy results showed that the particles of the dredged fill showed an agglomerated morphology, and the surface of the test soil samples had scaly fine flakes and a fragmented structure. In the triaxial shear test, the GD dredged fill showed strain hardening characteristics, and the effective stress path showed continuous loading characteristics; the consolidated undrained shear test showed that the GD dredged fill had shear expansion characteristics under low-perimeter-pressure conditions. It was found that, with an increase in bias stress, the axial strain in the consolidated undrained triaxial creep test under the same perimeter pressure conditions gradually exceeded the axial strain in the consolidated drained triaxial creep test. The results of this study are of theoretical and practical significance for further understanding the mechanical properties of silty soils in the region and for the rational selection of soil strength parameters in practical engineering design.

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.