非饱和黄土的力学特性及冻融循环下边坡稳定性的数值模拟
论文题目
Mechanical Characterization of Unsaturated Loess and Numerical Simulation of Slope Stability Under Freeze–Thaw Cycles
1.Key Laboratory of Environmental Geology of Qinghai Province, Qinghai Bureau of Environmental Geology Exploration, Xining 810007, Qinghai, China
2.Qinghai 906 Engineering Survey and Design Institute Co., Ltd., Xining 810007, Qinghai, China
3.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
研究内容
Abstract: The soils in the eastern region of Qinghai, China, are characterized by typical unsaturated loess with poor engineering properties, rendering them susceptible to geological disasters such as landslides. To investigate the mechanical properties of these soils, triaxial and direct shear tests were conducted, followed by simulations of deformation and stability under freeze–thaw cycles using the discrete element software MatDEM, based on the experimental data. The findings indicate that (1) the stress–strain curves from both tests typically exhibit weak strain-softening behavior, with increased matric suction enhancing shear strength; (2) in the direct shear test, both cohesion (c) and the angle of internal friction (φ) rise with matric suction, whereas in the triaxial test; cohesion increases while φ decreases; and (3) an increase in freeze–thaw cycles results in a gradual decline in slope safety factor, though the rate of decline diminishes over time. Additionally, initial water content and slope gradient changes significantly affect slope stability. These insights are essential for geohazard risk assessment and the formulation of prevention and control strategies in Qinghai and similar alpine regions.
Keywords: freezing and thawing cycles; landslides; MatDEM; shear strength; unsaturated loess
Fig.8 The relationship of shear strength and displacement
Fig.13 (a) Stratigraphic level curves; (b) particdle accumulation; and (c) defning the slope stratigraphy and assigning stratigraphic properties to slope models
Fig.14 Variation of landslide displacement: (a) at 25,000 time steps, (b) at 50,000 time steps, (c) at 75,000 time steps, and (d) at 100,000 time steps
Fig.15 Frictional heat of slopes: (a) at 25,000 time steps, (b) at 50,000 time steps, (c) at 75,000 time steps, and (d) at 100,000 time steps
了解详情
Wei, G., Xiao, J., Xia, Y., Peng, W., Wu, X., A, H., Qi, H., & Ren, Z. (2025). Mechanical characterization of unsaturated loess and numerical simulation of slope stability under freeze–thaw cycles. Advances in Civil Engineering, Volume 2025, Article ID 4445101. https://doi.org/10.1155/adce/4445101
