Relationship between Three-Dimensional Pore Structure and Interlayer Shear Performance of Cemented Sand and Gravel
ZHANG Yanan
CAI Xin
CHEN Xudong
GUO Xingwen
Abstract：To explore the relationship between the internal pore structure and shear strength of cemented sand and gravel(CSG)under different surface treatment methods.Python was used to preprocess and perform 3D reconstruction of X-ray computer tomography images of CSG under three different surface treatment methods,achieving 3D visualization and quantitative characterization of the internal pore structure.Combined with indoor direct shear test,the XGBoost algorithm was used to establish the relationship between 3D pore structure parameters and macroscopic mechanical properties.The results indicate that the surface treatment method significantly affects the 3D pore structure and mechanical properties of CSG.Untreated surfaces have irregular pore distributions,which can lead to stress concentration.In contrast,applying mortar or grout on the surface can effectively improve the pore structure,with grout being the most effective,significantly enhancing the uniformity and complexity of the pores in CSG.The relationship between pore sphericity and pore size distribution follows a double exponential decay,and more spherical pores help to improve friction performance.The research results can provide valuable insights for optimizing the construction process of cemented sand and gravel layers and improving their mechanical properties.
Keywords：cemented sand and gravelthree-dimensional pore structureinterfacial structureshear performanceXGBoost algorithm
Publication Date：2026-02-28
Online Publishing Date：2026-04-07(First online date of this platform, not the publication date of the document)
Pages：10( 223-232 )