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Bulletin of Engineering Geology and the Environment

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01.01.2023 | Original Paper

New insights into microstructure evolution mechanism of compacted loess and its engineering implications

verfasst von: Panpan Xu, Hui Qian, Jie Chen, Lingbo Wang, Xayda Abliz, Xiaoqiang He, Gaoxiang Ma, Yuan Liu

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 1/2023

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Abstract

As the macroscopic mechanical properties of soil are closely related to its microstructure, and loess historically played an important role in engineering construction, the effect of compaction on the microstructure of compacted loess was investigated using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) in this study. The SEM imaging results showed that as compaction degree increased, the loess microstructure evolved from an overhead weak into an interlocking semi-cementation, and then into a dispersion-strong cementation. Correspondingly, the pore characteristics mainly exhibited a transformation from macropores (diameter > 32 μm) to mesopores (diameter between 8 and 32 μm) and then to small pores (diameter between 2 and 8 μm). The MIP test results showed that the content volume of intragranular pores (diameter between 1.8 and 70 μm) decreased with increasing loess compactness, whereas the contents of intra-particle, interparticle, and intergranular pores were stable, indicating that the compaction of loess was mainly caused by compression of the intragranular pores. Additionally, the variation interval of the dominant pore type (intragranular pore) observed by the MIP test was consistent with the comprehensive variation interval of the pore types (macropore, mesopore, and small pores) observed by SEM imagery. These findings are helpful to explain the linkage law between loess structure, engineering characteristics, and catastrophic effects.

Vorheriger Artikel A brittle-ductile index for transversely isotropic rock based on energy evolution of the characteristic stress and its application

Nächster Artikel Statistical interpolation and spatial mapping of geotechnical soil parameters of District Sargodha, Pakistan

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Titel: New insights into microstructure evolution mechanism of compacted loess and its engineering implications
verfasst von: Panpan Xu
Hui Qian
Jie Chen
Lingbo Wang
Xayda Abliz
Xiaoqiang He
Gaoxiang Ma
Yuan Liu
Publikationsdatum: 01.01.2023
Verlag: Springer Berlin Heidelberg
Erschienen in: Bulletin of Engineering Geology and the Environment / Ausgabe 1/2023
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-022-03058-3

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