Sensitivity analysis of factors affecting the stability of high fill slopes

Authors

DOI:

https://doi.org/10.32347/2707-501x.2025.55(2).76-89

Keywords:

High-fill slope, Stability analysis, FLAC3D, Numerical simulation, Factor of safety, Parameter sensitivity

Abstract

 

In this study, a systematic analysis of the stability of unsupported tertiary high-fill slopes was carried out using the FLAC3D numerical simulation method, focusing on the nonlinear effects of fill parameters, contact boundary conditions and geometry on the coefficient of safety. The results showed that: Both the fill cohesion and the angle of internal friction showed a marginal decreasing effect on the factor of safety (the growth rate of the factor of safety decreased from 108% to 5.8% when the cohesion was increased from 0 kPa to 40 kPa, and the enhancement efficiency was significantly attenuated after the angle of internal friction exceeded 30°); The contact boundary step height change triggered the slip surface migration mechanism, 1.5m step height formed a localized safety factor recovery anomaly due to the slip surface cutting into the pebble layer, and 3m step width reduced the contact surface shear stress concentration by 65% through stress diffusion; The decrease in the safety factor accelerates when the slope gradient exceeded 45°, and the increase in the width of the unloading platform to 5 m increased the safety factor beyond the critical value of 1.0 by 30.5%. The FLAC3D numerical model realized the visualization prediction of sliding surface migration and stress redistribution, and the critical threshold effect it reveals provided theoretical support for the dynamic construction regulation. The study revealed the threshold effect for the conversion of damage modes of fill slopes, established a stability optimization framework considering the synergistic effect of parameters, and provided a theoretical basis for the design of high-fill slopes based on the regulation of strength parameters, optimization of interface geometry, and platform width proportioning.

References

Wang, J., Zhang, D., Zhang, Y., Chen, H., & Ma, W. (2022). Variations in hydraulic properties of collapsible loess exposed to wetting and shearing. Acta Geotechnica, 17(7), 2995-3015. https://doi.org/10.1007/s11440-021-01427-y

Dong, H., Wang, J., Zhang, D., Li, L., & Xu, Y. (2024). Unstable evolution of railway slope under the rainfall-vibration joint action. Journal of Mountain Science, 21(4), 1419-1431. https://doi.org/10.1007/s11629-023-8352-7

Dong, H., Wang, J., Zhang, D., Xu, Y., & Li, Z. (2022). Microscopic mechanism angle of repose in friable loess and its relationship with slope angle. Frontiers in Earth Science, 9, 777467. https://doi.org/10.3389/feart.2021.777467

Li, Z., Wang, J., & Zhang, D. (2021). Creep behavior of intact loess followed unloading paths. Frontiers in Earth Science, 9, 744864. https://doi.org/10.3389/feart.2021.744864

Zhang, F., Leshchinsky, D., Gao, Y., & Yang, S. (2018). Three-dimensional slope stability analysis of convex turning corners. Journal of Geotechnical and Geoenvironmental Engineering, 144(6), 06018003. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001896

Chang-gen, Y.A.N., Zhe-rui, L.I.A.N.G., Zhuo-long, J.I.A., Heng-Xing, L.A.N., Yu-ling, S.S., & Wan-Li, Y.A.N.G. (2023). Review on surface protection technologies of loess slope. Journal of Traffic and Transportation Engineering, 23(4), 1-22. Doi: 10.19818/j.cnki.1671-1637.2023.04.001

Zhang, F., Gao, Y., Leshchinsky, D., Yang, S., & Dai, G. (2018). 3D effects of turning corner on stability of geosynthetic-reinforced soil structures. Geotextiles and Geomembranes, 46(4), 367-376. https://doi.org/10.1016/j.geotexmem.2018.03.001

Zhang, F., Leshchinsky, D., Gao, Y., & Yang, S. (2019). Corner reinforced slopes: required strength and length of reinforcement based on internal stability. Geotextiles and Geomembranes, 47(3), 408-416. https://doi.org/10.1016/j.geotexmem.2019.01.004

Chongjing, W. A. N. G., ZHANG, L., & Guowei, L. I. U. (2023). Integrated assessment of soil cutting slope stability using fuzzy mathematics and numerical simulation. The Chinese Journal of Geological Hazard and Control, 34(6), 69-76. https://doi.org/10.16031/j.cnki.issn.1003-8035.202209026

Bračko, T., Žlender, B., & Jelušič, P. (2022). Implementation of Climate Change Effects on Slope Stability Analysis. Applied Sciences, 12(16), 8171. https://doi.org/10.3390/app12168171

Yao, Y., Zhang, J., Li, X., Tu, Y., & Zhong, Z. (2024). The Stability of Slopes and Building Structures Using an Energy Visualization Procedure. Buildings, 14(12), 3705. https://doi.org/10.3390/buildings14123705

Liu, L., Liu, J., Zhao, F., & Xu, Z. (2024). Energy-based criterion for slope failure considering groundwater and impact loading. Géotechnique Letters, 1-30. https://doi.org/10.1680/jgele.24.00065.

Raghuvanshi, T. K. (2019). Plane failure in rock slopes–A review on stability analysis techniques. Journal of King Saud University-Science, 31(1), 101-109. https://doi.org/10.1016/j.jksus.2017.06.004

Liu, X., Li, D. Q., Cao, Z. J., & Wang, Y. (2020). Adaptive Monte Carlo simulation method for system reliability analysis of slope stability based on limit equilibrium methods. Engineering Geology, 264, 105384. https://doi.org/10.1016/j.enggeo.2019.105384

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Published

2025-03-28

How to Cite

XIAOBING, C. ., & DZHEDZHULA, V. . (2025). Sensitivity analysis of factors affecting the stability of high fill slopes. Ways to Improve Construction Efficiency, 2(55), 76–89. https://doi.org/10.32347/2707-501x.2025.55(2).76-89

Issue

Vol. 2 No. 55 (2025): Ways to Improve Construction Efficiency

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Papers

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