Three-dimensional seismic stability analysis of unsaturated soil slopes

JI Yufei; SHAO Shuai; SHAO Shengjun; ZHU Xueliang; YAN Guangyi

doi:10.11779/CJGE20231125

Volume 47 Issue 3

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Chinese Journal of Geotechnical Engineering > 2025 > 47(3): 627-635. > DOI: 10.11779/CJGE20231125

JI Yufei, SHAO Shuai, SHAO Shengjun, ZHU Xueliang, YAN Guangyi. Three-dimensional seismic stability analysis of unsaturated soil slopes[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(3): 627-635. DOI: 10.11779/CJGE20231125

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Three-dimensional seismic stability analysis of unsaturated soil slopes

1.
School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China
2.
State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area, Xi'an University, Xi'an 710048, China
3.
Shaanxi Key Laboratory of Loess Mechanics and Engineering, Xi'an University, Xi'an 710048, China
4.
China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, China

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Received Date: November 20, 2023
Available Online: June 12, 2024

Graphical Abstract

Abstract

Abstract

Slopes are highly susceptible to collapse under seismic action and are often accompanied by distinct three-dimensional (3D) features. The 3D stability of unsaturated soil slopes is investigated based on the principle of limit analysis upper bound and the one-dimensional stable infiltration model. A new 3D horizontal slicing method is proposed, which effectively considers the nonlinear distribution characteristics of unsaturated soil gravity, seismic acceleration and apparent cohesion. The seismic inertia force is expressed by a modified pseudo-dynamics method (MPDM) considering soil damping and resonance. The explicit expression for the slope safety factor is derived by gravity increase method (GIM). Comparison and validation with the existing research results and a series of parameter studies were carried out. The results show that when the slope is subjected to seismic wave action close to the intrinsic frequency of the soil body, resonance phenomenon occurs and the slope safety coefficient decreases rapidly; under the action of the same seismic frequency, the safety coefficient decreases with the increase of seismic acceleration coefficient. When B/H < 3, the 3D effect is obvious, and the 3D effect should be taken into account in the design of the slope; the existence of suction contributes to maintaining slope stability.
- unsaturated soil,
- limit analysis,
- earthquake,
- modified pseudo-dynamic method,
- 3D stability

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References (21)

References

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