Cracking in compacted expansive soils under unidirectional wet-dry cycles: insights from X-ray computed tomography

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Xun Zhu, Zheng Chen, Pengpeng Ni, Zheng-Yin Cai, Ying-Hao Huang, Chen Zhang
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Abstract

Cracking of compacted clays during cyclic wetting–drying poses significant challenges to the stability of channel slopes. This study performed a series of unidirectional wet-dry tests to evaluate the cracking behavior of expansive soils collected from a channel slope in northern Xinjiang, China. Using computed tomography scanning and three-dimensional (3D) reconstruction, the internal crack characteristics of expansive soils were quantitatively described. The results indicate that the penetration depth of the cracks was stabilized after five cycles, reaching 31.4% of the initial specimen height. The morphologies of internal cracks revealed a transition in the cracking mode, form shallow and scattered cracks in the initial stage to deeper and more clustered cracks in the final stage. Centralized cracks were prominent in the first three wet-dry cycles, followed by a shift to crack deflection from the vertical plane in subsequent cycles. Four indices (i.e., slice crack ratio, crack length, branching number, and dead-end point) provided a satisfactory quantitative depiction of the evolution of the spatial distribution and connectivity of the cracks over the number of cycles. Additionally, the crack volume fraction and fractal dimension effectively evaluated the 3D cracking behavior of soil crack networks.

Abstract Image

Abstract Image

单向干湿循环下压实膨胀土的裂缝:X 射线计算机断层扫描的启示
压实粘土在湿-干循环过程中的开裂对渠道边坡的稳定性构成了重大挑战。本研究进行了一系列单向湿-干试验,以评估从中国新疆北部渠道边坡采集的膨胀土的开裂行为。通过计算机断层扫描和三维(3D)重建,对膨胀土的内部裂缝特征进行了定量描述。结果表明,裂缝的渗透深度在五个循环后趋于稳定,达到初始试样高度的 31.4%。内部裂缝的形态显示了开裂模式的转变,从初始阶段的浅而分散的裂缝到最后阶段的深而集中的裂缝。集中裂纹在前三个湿-干循环中比较突出,随后的循环中裂纹偏离了垂直面。四个指数(即切片裂缝率、裂缝长度、分支数和死角)对裂缝的空间分布和连通性随周期数的变化提供了令人满意的定量描述。此外,裂缝体积分数和分形维度也能有效评估土壤裂缝网络的三维开裂行为。
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
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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