Abstract
The earthquake-induced landslides frequently occur in weakly cemented soil or along the interface between two soil layers of different weathering levels. However, the investigation regarding the test procedure for determining the residual strength of weakly cemented soil is still limited. Thus, this study aims to investigate and compare the results obtained from single- and multi-stage procedures in ring shear tests, in which the multi-stage procedure was carried out by increasing and reducing normal stress as well as shear rate. In this study, the weakly cemented soil was created by mixing a small content of cement with kaolin clay. The combined specimens of two halves with different cementation were used to simulate the interface between two soil layers with different weathering levels. Accordingly, a series of single- and multi-stage procedures were performed under various test conditions on intact samples of non-cemented, weakly cemented kaolin clay, and combined samples of different cementation in ring shear apparatus. The results showed that the residual stress ratios obtained from different test methods tended to decrease as the normal stress increases, especially up to 294 kPa, except for the kaolin sample. The residual strength parameters obtained from different test methods were significantly different corresponding to sample types, with a range of difference in residual friction angle from 0.1° to 6.1°, in residual cohesion intercept from 1.5 to 39.3 kPa. In general, the residual stress ratios increased as the shear rates increased, except for the 4% cemented kaolin sample in the single-stage procedure.
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Acknowledgements
This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant No. 105.08-2019.315. The authors also would like to thank the staff at the Geotechnical Lab., Yamaguchi University, Japan, for helping us during conducting the experiments.
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Duong, N.T., Van Hai, N. Residual Strength of Weakly Cemented Kaolin Clay in Multi-stage Ring Shear Test. Arab J Sci Eng 47, 4437–4451 (2022). https://doi.org/10.1007/s13369-021-06132-2
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DOI: https://doi.org/10.1007/s13369-021-06132-2