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Study on the Characterization Method and Evolution Law of the Three-Dimensional Pore Structure in Frozen Loess Under Loading

SSRN, ISSN: 1556-5068
2023
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Article Description

In this study, a functional relationship for frozen soil at different temperatures, confining pressures, and triaxial compressive strengths is established through macroscopic and mesoscopic comparative tests. Additionally, a three-dimensional pore network model at the mesoscopic scale is constructed. Morphological characterization parameters are introduced to quantify the pore structure, and the evolution of pore structure in frozen soil during the stress process is analyzed, as well as the influence of temperature and confining pressure on pore characteristics and failure morphologies. The results reveal that at the macroscale, frozen soil exhibits an exponential relationship among temperature, confining pressure, and triaxial compressive strength. During mechanical loading, frozen soil undergoes compaction, pore development, and pore expansion stages, leading to changes in pore size and connectivity. Additionally, temperature and confining pressure significantly impact the pore characteristics and failure morphologies of frozen soil. At lower temperatures, frozen soil experiences severe bulging and brittle failure, accompanied by increased pore size, enhanced connectivity, and complex morphology. Increasing confining pressure reduces the degree of bulging and damage, decreases porosity and connectivity, enhances the complexity of pore morphology, and results in a denser and more stable internal structure of frozen soil. Through this study, a better understanding of the damage behavior of frozen soil under different temperatures and confining pressures is achieved. Furthermore, this research provides a theoretical basis and reference for addressing related engineering problems.

Bibliographic Details

Shijie Chen; Wei Ma; Guoyu Li

Elsevier BV

Multidisciplinary; Frozen loess; CT scanning; three-dimensional pore structure; three-dimensional pore network model

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