Stability of infinite unsaturated soil slopes with tensile strength cut-off

LI Meng-zi; CAI Guo-qing; LI Hao; YANG Bei-bei; ZHAO Cheng-gang

doi:10.11779/CJGE202004013

Volume 42 Issue 4

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Chinese Journal of Geotechnical Engineering > 2020 > 42(4): 705-713. > DOI: 10.11779/CJGE202004013

LI Meng-zi, CAI Guo-qing, LI Hao, YANG Bei-bei, ZHAO Cheng-gang. Stability of infinite unsaturated soil slopes with tensile strength cut-off[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(4): 705-713. DOI: 10.11779/CJGE202004013

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Stability of infinite unsaturated soil slopes with tensile strength cut-off

LI Meng-zi^{1, 2,},
CAI Guo-qing^{1, 2, ,},
LI Hao³,
YANG Bei-bei⁴,
ZHAO Cheng-gang^{1, 2}

1.
Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
2.
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
3.
Bureau of Transport of Henan Province, Zhengzhou 450003, China
4.
Zhengzhou Branch of Beijing Urban Construction Design& Development Group Co., Ltd., Zhengzhou 450000, China

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Received Date: March 14, 2019
Available Online: December 07, 2022

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Abstract

Abstract

Based on the Fredlund strength theory, a nonlinear strength criterion for unsaturated soils is proposed. The tensile strength envelope of the Fredlund strength theory as a result of extrapolation of compressive tests into the tensile regime is partially truncated or eliminated in the new strength criterion. The new tensile strength cut-off criterion (C-F criterion) allows to construct the failure mechanisms including rupture mode and shear deformation mode. Then a generalized framework for the stability of infinite slopes under steady unsaturated seepage conditions is put forward using the C-F criterion, and a uniform expression for the safety factor under nonlinear strength criterion is given. The influences of tensile strength cut-off and seepage on slope stability can be considered. The results show that the stability factors for infinite slopes in unsaturated soils with tensile strength cut-off are reduced compared to those based on the Fredlund strength envelope, with the largest drop for steep slopes particularly subjected to heavy rainfall infiltration.
- unsaturated soil,
- infinite slope,
- tensile strength,
- cut-off

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References (31)

References

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