Three-dimensional seismic stability of unsaturated soil slopes using pseudo-dynamic approach

WANG Long; CHEN Guoxing; HU Wei; SUN Dean; LI Jie; LIU Wenhua

doi:10.11779/CJGE20220765

Volume 45 Issue 9

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Chinese Journal of Geotechnical Engineering > 2023 > 45(9): 1859-1867. > DOI: 10.11779/CJGE20220765

WANG Long, CHEN Guoxing, HU Wei, SUN Dean, LI Jie, LIU Wenhua. Three-dimensional seismic stability of unsaturated soil slopes using pseudo-dynamic approach[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(9): 1859-1867. DOI: 10.11779/CJGE20220765

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Three-dimensional seismic stability of unsaturated soil slopes using pseudo-dynamic approach

WANG Long^{1, 2, 3,},
CHEN Guoxing²,
HU Wei^3, ,,
SUN Dean⁴,
LI Jie⁵,
LIU Wenhua¹

1.
School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
2.
Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 211816, China
3.
State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology, Chengdu 610059, China
4.
School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China
5.
School of Engineering, RMIT University, Melbourne 3001, Australia

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Received Date: June 15, 2022
Available Online: March 09, 2023

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Abstract

Abstract

The seismic excitation remains the main factor in triggering the slope failures that present three-dimensional (3D) features universally. The slopes combined with anti-slide piles are the effective reinforcement techniques in improving the slope stability and are widely employed in slope failure preventions. Based on the upper bound limit analysis theorem and the pseudo-dynamic approach, the plasticity deformation theory is extended to unsaturated soils, and a modified horizontal slice method is proposed to calculate the work rates of unsaturated soil gravity, seismic inertial forces and pile lateral resistance forces as well as the energy dissipation rate of apparent cohesion that are all characterized with nonlinear distribution features. The semi-analytical method is validated through comparisons with the analytical solutions. A series of parametric analyses are conducted regarding the seismic responses of unsaturated soil slopes. The improvements in seismic slope stability due to soil suction are studied systematically. The results show that the slope safety is underestimated by 15% ~ 30% when the soil suction is not considered in the analyses. The suction effects depend on the seismic excitations and are enhanced significantly when the seismic wave approaches the peak. The horizontal acceleration coefficient and soil shear modulus both have a great influence on the slope stability. The critical slip surface becomes much shallower under excitation conditions.
- unsaturated soil slope,
- limit analysis,
- pseudo-dynamic approach,
- matric suction,
- 3D effect

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References

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