Numerical Analyses of Seismic Reponses of Unsaturated Slopes from Cuttings and Embankments

doi:10.16183/j.cnki.jsjtu.2024.181

Abstract

Abstract:

This paper explores the seismic response differences between cutting slopes and embankment slopes, with a particular focus on the impact of initial water content on the seismic performance of unsaturated slopes. To achieve this, a soil-water-air three-phase coupled numerical analysis method is developed within the framework of unsaturated soil mechanics. This numerical approach is employed to simulate the deformation patterns and acceleration responses of both slope types during an earthquake. Additionally, the influence of initial water content on the dynamic behavior of the slopes is examined. The results indicate that high initial water content reduces the risk of sliding failure in cut slopes due to the stabilizing effect of the adjacent undisturbed ground. Embankment slopes exhibit a more pronounced sliding tendency, with greater displacement observed at the slope toe.

Key words: unsaturated soils, cutting slope, embankment slope, seismic response, numerical analysis

CLC Number:

TU435

XIE Yi, ZHU Wenxuan, XIONG Yonglin, YE Guanlin. Numerical Analyses of Seismic Reponses of Unsaturated Slopes from Cuttings and Embankments[J]. Journal of Shanghai Jiao Tong University, 2026, 60(3): 473-485.

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参数	取值	参数	取值
λ	0.035	m	0.1
κ	0.008	m^*	1.5
ν	0.3	b_r	1.5
M	1.3	N(S_r)	0.6
N	0.58

参数	取值
${S}_{r}^{s}$	0.88
${S}_{r}^{r}$	0.49
s_d	1
s_w	0.1
${k}_{s1}^{s}$	800
c₁	0.012
c₂	0.1
c₃	50