Limit Equilibrium Search Analysis for Virtual Back of Cantilever Retaining Walls
Structures · AEC industry
A paper in the Taiwan Professional Civil Engineers bulletin examines virtual wall back inclinations, highlighting safety factor reversals between simplified and search methods.
Civil and structural engineer Hu Zheng-ning analyzes external stability assessments for cantilever RC retaining walls. Conventional practice often assumes a vertical virtual wall back (θv=0°), which can overestimate soil stabilizing weight in static flat cases. Under seismic and backfill slope combinations, the exaggerated soil volume generates excess horizontal inertia, causing safety factors to fall below numerical search values. The author proposes a dual-track design approach.
Key takeaways
- The limit equilibrium search method scans critical slip surfaces, accounting for stabilizing downward components and cutting excess soil inertia during seismic events.
- The traditional vertical assumption overstates stability margins in static flat conditions but yields lower safety factors under combined slope and seismic loads.
Source：台灣省土木技師公會｜技師報 Read the original ↗
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