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Investigation on strength degradation of sandy soil subjected to concentrated particle erosion

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Abstract

There is increasing concern regarding local concentrated erosion scenarios such as piping and underground cavities due to their catastrophic consequences. In this study, local concentrated erosion was reproduced by placing shaped erodible columns within the triaxial specimens during sample preparation. The preplaced erodible columns (made of glucose) were set similar in regard to their volume fraction but different in configurations. Bender element measurements were performed in dry, the erosion on-going, and post erosion states to evaluate the mechanical behavior of the samples subjected to concentrate particle removal. The influence of concentrated particle erosion on the shear wave velocity, shear strength, dilatancy and peak angle of shearing resistance was revealed and discussed. It is generally concluded that the resultant effect on the mechanical behavior of soils is greater when erodible particles are more localized within a limited region, especially for densely packed soils.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51609171), and the Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering (No. 2019492311). The authors would like to thank Prof. Xiaoqiang Gu for his assistance in the bender element measurement. Graduate student Mr. Min Ye performed part of the experiments. The supports mentioned above are greatly appreciated.

Funding

This work is supported by the National Natural Science Foundation of China (No. 51609171), and the Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering (No. 2019492311).

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WM: investigation, writing—original draft. CX: conceptualization, writing—review and editing. YY: conceptualization, investigation, methodology, writing, funding acquisition.

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Correspondence to Yang Yang.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Mao, W., Xu, C. & Yang, Y. Investigation on strength degradation of sandy soil subjected to concentrated particle erosion. Environ Earth Sci 81, 1 (2022). https://doi.org/10.1007/s12665-021-10123-9

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