非饱和路堑和路堤边坡地震响应的数值分析

doi:10.16183/j.cnki.jsjtu.2024.181

摘要/Abstract

摘要：

为了探究路堑边坡和路堤边坡地震响应的差异,以及初始含水量对非饱和边坡地震表现的影响,在非饱和土力学框架下开发了一种土-水-气三相耦合数值分析方法.以路堑边坡和路堤边坡为研究对象,采用有限元数值模拟的方法分析了两类边坡在位移模式和加速度响应上的区别,同时探究了土体初始含水量对非饱和边坡地震响应的影响.结果表明,路堑边坡因后方边界的约束,在高含水量下发生滑动破坏的风险较低;而路堤边坡的滑动趋势明显,坡脚位移更大.

关键词: 非饱和土, 路堑边坡, 路堤边坡, 地震响应, 数值分析

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

中图分类号:

TU435

谢轶, 朱文轩, 熊勇林, 叶冠林. 非饱和路堑和路堤边坡地震响应的数值分析[J]. 上海交通大学学报, 2026, 60(3): 473-485.

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