Reliability analysis of geosynthetic-reinforced slopes under rainfall infiltration

The rainfall-induced instability of geosynthetic-reinforced is a time-dependent phenomenon owing to the infiltration process, and is influenced by rainfall patterns. Catering to the inherent uncertainty in soil properties, this study conducted a reliability analysis of three-dimensional (3D) vertica...

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Bibliographic Details
Published in:Geotextiles and geomembranes 2024-02, Vol.52 (1), p.156-165
Main Authors: Hou, C.Q., Xu, Q., Li, Y.X., Sun, Z.B.
Format: Article
Language:English
Subjects:
3D reinforced slope
Probabilistic analysis
Rainfall infiltration
Time-dependent failure
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Summary:The rainfall-induced instability of geosynthetic-reinforced is a time-dependent phenomenon owing to the infiltration process, and is influenced by rainfall patterns. Catering to the inherent uncertainty in soil properties, this study conducted a reliability analysis of three-dimensional (3D) vertical geosynthetic-reinforced slopes, in order to explore how the probabilistic stability of slope evolves over time under different rainfall patterns. A 3D horn-like mechanism incorporating the Conte-Troncone (CT) model is adopted as a framework for deterministic analysis. Through a Fourier transform-based theoretical reasoning, the CT model assesses the time-variable pore-water pressure of soils in response to any continuously varying rainfall intensity over time. Subsequently, the pore water pressure-driven changes in soil unsaturated strength and the corresponding extend power are integrated into the three-dimensional mechanism, enabling a rapid determination of the instantaneous safety factor at discrete time instants. To avoid the tedious computation generated by Monte Carlo simulation, a simplified Hasofer-Lind-Rackwitz-Fiessler (HLRF) algorithm is used to calculate the time-varying reliability indices. Using the implantation of the proposed method, the effects of rainfall pattern, slope width, and reinforcement tensile strength are investigated by parametric analysis. •An analytical reliability approach for 3D geosynthetic reinforced slopes subjected to rainfall infiltration is presented.•The Conte-Troncone model is introduced to evaluate the time-varying pore-water pressure of unsaturated soils.•A simplified Hasofer-Lind-Rackwitz-Fiessler (HLRF) algorithm is used to calculate the reliability indices.
ISSN:0266-1144
DOI:10.1016/j.geotexmem.2023.09.010