An investigation of aggregate breakup of structured soft clay under one-dimensional compression based on FESEM images

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-01-04 DOI:10.1007/s10064-024-04075-0

Chao Ye, Qian Cheng, Hong Sun, Fujun Niu, Yue Li

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Abstract

The aggregate breakup of structured soft clay has an important influence on the properties of the soil. In this paper, the aggregate breakup of structured soft clay under one-dimensional compression is investigated based on FESEM images, and the relative breakage Br is used to assess the degree of aggregate breakup, and the results show that: The structured soft clay consists of dispersed clay particles, clay aggregates and pores. When the soil is loaded, not only pores change but also clay aggregates breakup occurs. The compression process is divided into three stages: initial structured breakup stage, aggregate breakup stage, and compression stabilization stage. The degree of aggregate breakup is increasing with the increase in vertical load, the greater the degree of breakup, the greater the fractal dimension, and the maximum Br is 0.33. The void ratio decreases nearly linearly with the increase of Br, and the compressive modulus changes exponentially when the Br exceeds 0.20. The empirical formulae established can be utilized to predict the void ratio and compression modulus, and provide a reference for studying the aggregate breakup of structured soft clay.

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基于FESEM图像的结构性软黏土一维压缩下骨料破碎研究

结构性软粘土的团粒破碎对土的性质有重要影响。本文基于FESEM图像研究了结构性软粘土在一维压缩下的骨料破碎，并采用相对破碎率Br来评价骨料破碎程度，结果表明：结构性软粘土由分散的粘土颗粒、粘土团聚体和孔隙组成；在土体加载过程中，不仅孔隙发生变化，粘土团聚体也发生破碎。压缩过程分为三个阶段：初始结构破碎阶段、骨料破碎阶段和压缩稳定阶段。骨料破碎程度随竖向荷载的增大而增大，破碎程度越大，分形维数越大，Br最大值为0.33。孔隙率随Br的增加呈近似线性减小，压缩模量在Br超过0.20时呈指数变化。所建立的经验公式可用于预测孔隙比和压缩模量，为研究结构性软粘土的骨料破碎提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.