The influence of the interface morphology and stiffness ratio of the deformation modulus of upper and lower layers on the stress-shear displacement curves and shear strength parameters were investigated with numerical shear tests in PFC2D. The shear strength of the specimen increases with the increase of the normal stress. The lager the normal stress, the later the peak shear stress would appear. In case of saw teeth at the interface, the peak values of the shear stress appear in the end of the shear tests. The increase of the stiffness ratio can cause the connection fracture in the lower layer particles with smaller stiffness and reduce the thickness of the shear band. The smaller saw teeth size and stiffness ratio, the larger the shear stress.
Double soil layers Interface Shear test Saw teeth Stiffness ratio
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This work was funded by the National Key R&D Program of China (2016YFC0600903).
Hu, L., Pu, J.: Testing and modeling of soil-structure interfaces. J. Geotech. Geoenviron. Eng. 130(8), 851–860 (2004)CrossRefGoogle Scholar
Hu, L., Zhang, B., Ma, J.: Mechanical characteristics for interface between granular materials. Mech. Res. Commun. 37(1), 42–46 (2010)CrossRefGoogle Scholar
Lashkari, A.: A simple critical state interface model and its application in prediction of shaft resistance of non-displacement piles in sand. Comput. Geotech. 88, 95–110 (2017)CrossRefGoogle Scholar
Kock, I., Huhn, K.: Numerical investigation of localization and micromechanics in a stratified soil specimen. Struct. Geol. 29(10), 1679–1694 (2007)CrossRefGoogle Scholar
Gu, X.Q., Huang, M.S., et al.: Discrete element modeling of shear band in granular materials. Theoret. Appl. Fract. Mech. 72, 37–49 (2014)CrossRefGoogle Scholar
Zhu, H., Zhou, W.H., et al.: Numerical study of the formation of shear bands in soil under interface shearing. Procedia Eng. 175, 102–109 (2017)CrossRefGoogle Scholar
Lei, D., Huang, J., et al.: Deformation analysis of shear band in granular materials via a robust plane shear test and numerical simulation. Powder Technol. 323, 285–392 (2018)CrossRefGoogle Scholar