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Meso and macroscale mechanical behaviors of soil–rock mixtures
Composed of large rock blocks and fine soil particles, the physical and mechanical behaviors of soil–rock mixtures (S–RMs) are quite complex. To develop insight into the S–RM deformation and failure mechanisms on the macro and mesoscales, CT image sequences of the samples were obtained on different stages of the S–RM triaxial test. Then, the 3D mesostructures of the samples were reconstructed based on the developed 3D Meso-Structure Reconstruction and Analysis System (MSRAS3D), and the algorithms required for quantitative analysis of the S–RM mesostructure were provided. The fracture and motion processes of the rock blocks in the S–RM sample were tracked based on the reconstructed 3D models. Because of the influence of the sample preparation method, the primary axes of the rock blocks trended toward the horizontal direction. This led to the initial anisotropy of the S–RM’s mesoscale structure. To compare reconstructed 3D models of the samples from different test stages, three types of the rock-block breakage modes were analyzed: disintegration, fracturing, and edge-corner breakage. The tests results indicated that the influence of the rock blocks makes the S–RM stronger than soil, The S–RM p–q curve was not a straight line due to the rock block breakage. As a result, a modified Mohr–Coulomb strength relationship in the form of a power function was suggested.
Meso and macroscale mechanical behaviors of soil–rock mixtures
Composed of large rock blocks and fine soil particles, the physical and mechanical behaviors of soil–rock mixtures (S–RMs) are quite complex. To develop insight into the S–RM deformation and failure mechanisms on the macro and mesoscales, CT image sequences of the samples were obtained on different stages of the S–RM triaxial test. Then, the 3D mesostructures of the samples were reconstructed based on the developed 3D Meso-Structure Reconstruction and Analysis System (MSRAS3D), and the algorithms required for quantitative analysis of the S–RM mesostructure were provided. The fracture and motion processes of the rock blocks in the S–RM sample were tracked based on the reconstructed 3D models. Because of the influence of the sample preparation method, the primary axes of the rock blocks trended toward the horizontal direction. This led to the initial anisotropy of the S–RM’s mesoscale structure. To compare reconstructed 3D models of the samples from different test stages, three types of the rock-block breakage modes were analyzed: disintegration, fracturing, and edge-corner breakage. The tests results indicated that the influence of the rock blocks makes the S–RM stronger than soil, The S–RM p–q curve was not a straight line due to the rock block breakage. As a result, a modified Mohr–Coulomb strength relationship in the form of a power function was suggested.
Meso and macroscale mechanical behaviors of soil–rock mixtures
Acta Geotech.
Xu, Wen-Jie (author) / Zhang, Hai-Yang (author)
Acta Geotechnica ; 17 ; 3765-3782
2022-09-01
18 pages
Article (Journal)
Electronic Resource
English
Computed tomography (CT) , 3D reconstruction , Mechanical behavior , Meso-structure , Soil–rock mixture (S–RM) Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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