Study on Fractal Characteristics of Pore Structure of Unsaturated Loess Based on NMR

DOI

10.2991/978-94-6463-449-5_19How to use a DOI?

Keywords

unsaturated loess; microscopic pore structure; fractal dimension; nuclear magnetic resonance

Abstract

Under the influence of water and external loads, the microstructure of loess changes, leading to a loss of strength and ultimately frequent engineering accidents. The fractal characteristics and influencing factors of the microscopic pore structure of unsaturated loess were investigated using nuclear magnetic resonance (NMR) test and fractal theories. The results show that the microscopic pore structure of the sample at different dry densities is dominated by small and medium pores, and increasing the dry density can significantly reduce the medium pores and large pores of the soil. However, the effect on the micro and small pores was small, resulting in the fractal dimension of the medium pores (D₃), and the fractal dimension of the large pores (D₄) increased with increasing dry density, whereas the fractal dimension of the small pores (D₂) did not change significantly. The moisture content significantly affected the medium pores and large pores of the soil, decreasing the fractal dimension of small pores (D₂) and large pores (D₄) with increasing moisture content and the fractal dimension of medium pores (D₃) with increasing moisture content. The medium pore structure of the soil was more sensitive to the change in moisture content when the dry density was smaller, and increasing the dry density effectively reduced the effect of moisture content on the large pore structure of the soil.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Yuhan Guo
AU  - Jiandong Li
AU  - Xu Wang
AU  - Yanjie Zhang
AU  - Daijun Jiang
AU  - Daming Zhang
PY  - 2024
DA  - 2024/06/30
TI  - Study on Fractal Characteristics of Pore Structure of Unsaturated Loess Based on NMR
BT  - Proceedings of the 2024 8th International Conference on Civil Architecture and Structural Engineering (ICCASE 2024)
PB  - Atlantis Press
SP  - 189
EP  - 198
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-449-5_19
DO  - 10.2991/978-94-6463-449-5_19
ID  - Guo2024
ER  -