Effects of skeleton void ratio on the strength and deformation characteristics of coarse-grained soil

Authors

Jia-jun PAN, Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China
Xiang-jun SUN, Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China
Yong-zhen ZUO, Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China
Jun-peng WANG, Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China
Yi-wei LU, Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China
Bing HAN, Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China

Abstract

The strength and deformation characteristics of coarse-grained soil are closely related to the initial gradation and dry density during specimen preparation. To study the strength and deformation characteristics of coarse-grain materials with different gradations and densities, a simple and generalized method for calculating the skeleton void ratio of coarse-grained soil is proposed. The results of laboratory tests show that there is an obvious monotonic variation between the skeleton void ratio obtained by this calculation method and the mechanical properties of coarse-grained soil. When the specimen size is consistent, with the decrease of the skeleton void ratio, the failure shear stress increases, the failure friction angle increases, and the cohesion decreases. Also, as the skeleton void ratio decreases, the average initial tangent elastic modulus increases and the average initial tangent Poisson's ratio decreases. On the whole, the smaller the skeleton void ratio, the greater the strength and stiffness of the coarse-grained soil. Based on this, a scale-down method of coarse-grained soil with equivalent skeleton void ratio is proposed in this paper.

Recommended Citation

PAN, Jia-jun; SUN, Xiang-jun; ZUO, Yong-zhen; WANG, Jun-peng; LU, Yi-wei; and HAN, Bing (2023) "Effects of skeleton void ratio on the strength and deformation characteristics of coarse-grained soil," Rock and Soil Mechanics: Vol. 44: Iss. 8, Article 2.
DOI: 10.16285/j.rsm.2022.6408
Available at: https://rocksoilmech.researchcommons.org/journal/vol44/iss8/2