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Seismic slope stability analysis using modified pseudo dynamic method with uniform random field of initial phases.
Liang Xu1, Hongliang Jing1, Jiahui Wen1
1School of Civil Engineering, Qingdao University of Technology, Qingdao, China.
Plos One
|August 22, 2025
Summary
This study introduces a modified pseudo dynamic Bishop method (MPDBM) for slope seismic stability analysis. It reveals that considering spatial variability in initial phases, unlike traditional methods, provides a more accurate minimum factor of safety, especially for larger slopes.
Area of Science:
- Geotechnical Engineering
- Earthquake Engineering
- Computational Mechanics
Background:
- Seismic slope stability analysis is crucial for infrastructure safety.
- Traditional pseudo dynamic methods often simplify initial phase conditions.
- Spatial variability of soil properties can significantly influence seismic response.
Purpose of the Study:
- To develop an enhanced pseudo dynamic method for seismic slope stability analysis.
- To investigate the impact of initial phase spatial variability on slope safety.
- To evaluate the scale effect on the minimum factor of safety.
Main Methods:
- Development of the modified pseudo dynamic Bishop method (MPDBM).
- Incorporation of a uniform random field for different and correlated initial phases.
- Uniform sampling approach for enhanced analysis.
- Numerical simulations on homogeneous soil slopes of varying scales.
Main Results:
- The MPDBM accurately predicts seismic slope stability by considering initial phase variability.
- Traditional methods underestimate the minimum factor of safety (FSmin) when spatial variability is ignored.
- The underestimation of FSmin increases with slope scale, particularly when subjected to natural frequencies.
Conclusions:
- The modified pseudo dynamic Bishop method offers a more realistic assessment of seismic slope stability.
- Accounting for the spatial variability of initial phases is essential for accurate FSmin determination.
- Scale of fluctuation significantly impacts slope stability under seismic loading.
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