Relationship between void characteristics and re-liquefaction resistance: An image analysis study

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2024-09-23 DOI:10.1016/j.sandf.2024.101506
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Abstract

To scrutinize the impact of void characteristics on re-liquefaction resistance, a series of constant-volume cyclic bi-axial tests was conducted on an assembly of plastic rods. The first and second liquefaction stages involved the application of isotropic compression at 100 kPa followed by constant-volume cyclic loading with the deviator stress set at 30 or 60 kPa. This study introduced an innovative image analysis method to quantify four void characteristics: anisotropy index (Ie) and average void element size (Ae) for the element-based analysis, and local anisotropy index (Ie,ij) and local void ratio (eij) for the grid-based analysis. The newly developed anisotropy index was seen to facilitate the assessment of the primary alignment and degree of anisotropy in void elements. The results confirmed that an increase in re-liquefaction resistance is evident in specimens with lower average eij, coefficient of variation (CV) of eij, and Ie, indicating denser, more homogeneous, and isotropic conditions. Nevertheless, specimens with a greater degree of anisotropy were found to be more susceptible to re-liquefaction. The development of strain in the early stages of cyclic loading was found to be predominantly influenced by the anisotropy index, underscoring the imperative need for an enhanced method that can predict liquefaction resistance, as well as re-liquefaction resistance, and incorporates the anisotropy index.
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空隙特征与抗再液化能力之间的关系:图像分析研究
为了仔细研究空隙特性对抗再液化能力的影响,对塑料棒组件进行了一系列恒容循环双轴试验。第一和第二液化阶段包括施加 100 kPa 的各向同性压缩,然后是恒容循环加载,偏差应力设定为 30 或 60 kPa。本研究引入了一种创新的图像分析方法来量化四种空隙特征:基于元素分析的各向异性指数(Ie)和平均空隙元素尺寸(Ae),以及基于网格分析的局部各向异性指数(Ie,ij)和局部空隙率(eij)。新开发的各向异性指数有助于评估空隙元素的主要排列和各向异性程度。结果证实,平均 eij、eij 变异系数 (CV) 和 Ie 较低的试样抗再液化能力明显增强,这表明试样更致密、更均匀且各向同性。然而,各向异性程度较高的试样更容易发生再液化。在循环加载的早期阶段,应变的发展主要受各向异性指数的影响,这突出表明迫切需要一种能预测抗液化能力和抗再液化能力并包含各向异性指数的增强型方法。
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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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