Displacement field research of soil beneath shallow foundation based on digital image correlation method

Yadong Chen; Yuexin She; Jiangdong Cai; Jinmin Zai

doi:10.1117/12.839327

25 August 2009 Displacement field research of soil beneath shallow foundation based on digital image correlation method

Yadong Chen, Yuexin She, Jiangdong Cai, Jinmin Zai

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 737550 (2009) https://doi.org/10.1117/12.839327
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

An optical deformation measurement system based on digital image correlation method (DICM) is developed for observing soil displacement patterns beneath a laboratory-scale surface shallow foundation. Reliability and precision of this system are validated by an example, which has a sub-pixel precision when tracking the movement of natural sand. The study results show that it is viable to analyze the displacement field of soil beneath shallow foundation by DICM. As the loading increases, the soil is gotten into the phase of elastoplastic deformation. Then, the first continuous slip surface is generated, which likes the slip surface deduced by the limit balance theory. The shallow foundation is rapidly subsided at the ultimate load phase, then, the second slip surface is generated beneath the footing. The shallow foundation presents the general shear failure. The local bound soil beneath shallow foundation isn't failure and keeps elastic equilibrium state, which likes an elastic kernel moved to the deep of the soil under ultimate load, and these two slip surfaces have the trend of convergence near the earth's surface.

Citation Download Citation

Yadong Chen, Yuexin She, Jiangdong Cai, and Jinmin Zai "Displacement field research of soil beneath shallow foundation based on digital image correlation method", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737550 (25 August 2009); https://doi.org/10.1117/12.839327

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