Study on micromechanical behavior and energy evolution of granular material generated by latent diffusion model under rotation of principal stresses--颗粒学报PARTICUOLOGY

Zhong, J., Zheng, J., Gao, L., Wu, Q., Guan, Z., Li, S., & Wang, D. (2025). Study on micromechanical behavior and energy evolution of granular material generated by latent diffusion model under rotation of principal stresses. Particuology, 96, 71-83. https://doi.org/10.1016/j.partic.2024.10.015

Study on micromechanical behavior and energy evolution of granular material generated by latent diffusion model under rotation of principal stresses

Jichen Zhong^a, Junxing Zheng^a *, Lin Gao^a *, Qixin Wu^b, Zhenchang Guan^c, Shuangping Li^d, Dong Wang^{a e}

a School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
b School of Civil Engineering, Wuhan University, Wuhan, 430074, China
c College of Civil Engineering, Fuzhou University, Fuzhou, 350116, China
d Changjiang Spatial Information Technology Engineering Co., Ltd., Wuhan, 430074, China
e Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, 430010, China

10.1016/j.partic.2024.10.015

Volume 96, January 2025, Pages 71-83

Received 15 July 2024, Revised 21 October 2024, Accepted 24 October 2024, Available online 2 November 2024, Version of Record 19 November 2024.

E-mail: junxing@hust.edu.cn; lingao@hust.edu.cn

Highlights

• Sand particles with real morphology were generated by combining image processing technology and LDM.

• A mesoscale model to simulate behavior of granular materials under complex stress paths was established.

• Influence of particle morphology on micromechanical properties and energy evolution of sand was studied.

Abstract

In this study, advanced image processing technology is used to analyze the three-dimensional sand composite image, and the topography features of sand particles are successfully extracted and saved as high-quality image files. These image files were then trained using the latent diffusion model (LDM) to generate a large number of sand particles with real morphology, which were then applied to numerical studies. The effects of particle morphology on the macroscopic mechanical behavior and microscopic energy evolution of sand under complex stress paths were studied in detail, combined with the circular and elliptical particles widely used in current tests. The results show that with the increase of the irregularity of the sample shape, the cycle period and radius of the closed circle formed by the partial strain curve gradually decrease, and the center of the circle gradually shifts. In addition, the volume strain and liquefaction strength of sand samples increase with the increase of particle shape irregularity. It is particularly noteworthy that obvious vortex structures exist in the positions near the center where deformation is severe in the samples of circular and elliptical particles. However, such structures are difficult to be directly observed in sample with irregular particles. This phenomenon reveals the influence of particle morphology on the complexity of the mechanical behavior of sand, providing us with new insights into the understanding of the response mechanism of sand soil under complex stress conditions.

Graphical abstract

Keywords

Pattern recognition; Latent diffusion model (LDM); DEM; Principal stress rotation (PSR); Mechanical response

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