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Published in: Bulletin of Engineering Geology and the Environment 2/2024

01-02-2024 | Original Paper

Evaluation of correlation between plasticity indicator and residual friction angle of fine-grained soils based on the flow index

Authors: Zhongnian Yang, Zhengyi Xu, Xipeng Qin, Guojun Cai, Xianzhang Ling, Wei Shi

Published in: Bulletin of Engineering Geology and the Environment | Issue 2/2024

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Abstract

The residual friction angle (\(\varnothing_r'\)) is an important indicator used to evaluate the stability of soil slopes, and most of its correlation studies are based on one or more parameters such as the plasticity index, clay fraction, and normal stress. Existing methods for residual friction angle prediction involving plastic limit measurements have the drawbacks of complicated procedures and excessive errors. In this paper, the flow index is used instead of the plasticity index, the plasticity index of fine-grained soil based on the flow index (FI) is proposed, and the correlation of the residual friction angle is studied. The results indicate that (1) both the flow index and plasticity index can reflect the plasticity capacity of fine-grained soil, but the flow index is simple to obtain and more accurate. (2) Flow index, flow clay factor, flow plasticity angle, and the vertical distance of A-Line (\(\Delta\) FI) can characterize the residual shear properties of fine-grained soils, which generally show that the residual friction angle gradually decreases with increasing plasticity. (3) To address the problem of scattered or excessive data in the existing calculation models, an improved model for calculating the residual friction angle is proposed based on the clay fraction and flow index, and its fitting results are significantly better than those of the existing calculation models. (4) The correlation between residual friction angle and flow index is suitable for predicting the accuracy of residual shear test results, but has limitations when used to predict the residual friction angle.

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Appendix
Available only for authorised users
Literature
go back to reference BSI (1990) BS 1377: methods of test for soils for civil engineering purposes. The British Standards Institute, London BSI (1990) BS 1377: methods of test for soils for civil engineering purposes. The British Standards Institute, London
go back to reference Wu TH (1996) Soil strength properties and their measurement. Landslides: Investigation and Mitigation, Special Report 247, Transportation Research Board, National Research Council, Washington, DC Wu TH (1996) Soil strength properties and their measurement. Landslides: Investigation and Mitigation, Special Report 247, Transportation Research Board, National Research Council, Washington, DC
Metadata
Title
Evaluation of correlation between plasticity indicator and residual friction angle of fine-grained soils based on the flow index
Authors
Zhongnian Yang
Zhengyi Xu
Xipeng Qin
Guojun Cai
Xianzhang Ling
Wei Shi
Publication date
01-02-2024
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 2/2024
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-023-03526-4

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