Abstract
A total of 54 groups of direct shear tests are carried out on the interface between concrete and clay to study the interface shear behaviors by using large-scale interfacial direct shear apparatus. The effect of unloading and roughness on the mechanical properties of the interface are discussed. The results show that the interface initial shear modulus and shear strength increases with the interface roughness R for the same residual load ratio η, and there exists an optimal residual load ratio ηb that corresponding with the maximum value of the relative growth rate of shear strength. The effect of unloading and interface roughness on the interface residual ratio of shear strength f r is limited when the value of η is larger than the critical residual load ratio η cs . However, the value of f r increases with the η when the value of η is less than η cs . At last, the shear dilatancy phenomenon is observed during the unloading process, while the strain-softening phenomenon is not be found in the experiment, and the maximum value of shear dilatancy presents a positive relationship with the interface roughness for the same residual load ratio η.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 41672265, No. 41272295 and No. 41572262) and Shanghai Rising-Star Program (No. 17QC1400600). The authors are deeply grateful for this support. The anonymous reviewers’ comments have improved the quality of this paper and are also greatly acknowledged.
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Zhao, C., Wu, Y., Zhao, C., Tao, G. (2018). Experimental Research on the Clay-Concrete Interface Shear Behaviors Considering the Roughness and Unloading Effect. In: Zhou, A., Tao, J., Gu, X., Hu, L. (eds) Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0125-4_58
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