YUAN Quan,SHI Xu,GAO Yan,et al.Lateral deformation and internal stress evolution of calcareous sand with different particle sizes[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(02):1-11.
YUAN Quan,SHI Xu,GAO Yan,et al.Lateral deformation and internal stress evolution of calcareous sand with different particle sizes[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(02):1-11. DOI: 10.13471/j.cnki.acta.snus.ZR20240232.
Lateral deformation and internal stress evolution of calcareous sand with different particle sizes
In the study,lateral compression and creep tests were performed on calcareous sands of varying particle sizes using a self-designed acrylic model box. The research focused on investigating the compression deformation, characteristics of particle breakage, and the evolution of internal stress in calcareous sand under various stress levels. The results indicate that when vertical stress is relatively low, the compression deformation, creep strain, and creep rate of calcareous sand decrease as particle size increases. Conversely, under higher vertical stress, these variables increase with particle size. This behavior is attributed to the fact that the deformation of calcareous sand is controlled by the rearrangement of particle positions and the extent of particle breakage. At low vertical stress, particle breakage is minimal and can be overlooked; as the particle size of calcareous sand increases, the irregularity of particle shapes also increases, which enhances inter-particle locking and thus suppresses deformation. However, as vertical stress increases, considerable particle breakage occurs in calcareous sand; moreover, larger particle sizes lead to more significant particle breakage. This exacerbates deformation, alters the particle contacts, and intensifies stress redistribution. Consequently, the distribution of vertical and lateral stresses within the calcareous sand shifts from a Weibull distribution to a normal distribution. During the creep process, the internal stress distribution of calcareous sand tends to become uniform.
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