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Open Access

ARTICLE

Stability of Saline Soil Subgrade Slopes under Surface Runoff and Seismic Action: A Case Study of the G0711 Urumqi–Yuli Expressway, China

Bingbing Han1,2, Ruidong Li1, Yu Zhang2,3,*, Hui Zhang4
1 Gansu Institute of Engineering Geology, Lanzhou, China
2 School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou, China
3 College of Engineering, University of Alaska Anchorage, Anchorage, AK, USA
4 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, China
* Corresponding Author: Yu Zhang. Email: email
(This article belongs to the Special Issue: Health Monitoring of Transportation Infrastructure Structure)

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2026.075275

Received 28 October 2025; Accepted 04 February 2026; Published online 06 July 2026

Abstract

To explore the impact of seismic action on the stability of saline soil subgrade slopes considering the influence of surface runoff on the strength of saline soil subgrade fillers, this paper first conducted shear tests on saline soil under different moisture contents to determine the influence of moisture content on the shear strength of saline soil. Then, the initial moisture field of the saline soil subgrade was simulated using COMSOL software, and a subgrade moisture content-strength parameter model was established based on the calculated moisture fields under different rainfall intensities. Subsequently, based on the subgrade moisture content-strength parameter model, the cohesion and internal friction angle of different moisture content layers of the subgrade were calculated to analyze the stability of the saline soil subgrade slope. Finally, FLAC3D was used to perform numerical simulations on models with different strength parameters, analyzing the displacement patterns of the saline soil subgrade slope and the internal subgrade under seismic action caused by different rainfall intensities. The following conclusions were drawn: Under seismic action, the moisture content of the subgrade slope is the main factor affecting the stability of the saline soil subgrade slope due to changes in cohesion; the maximum and minimum surface settlements of the subgrade occurred at rainfall intensities of 5 and 1 mm/h, respectively.

Keywords

Subgrade stability; saline soil; surface runoff; earthquake; numerical simulation

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