This study presents a case analysis of the reconstruction project at a landslide site located at marker 32K on Provincial Highway 159A in Guanghua Village, Chiayi County, Taiwan. The investigation employs the finite difference method using the Fast Lagrangian Analysis of Continua (FLAC) software to perform a two-dimensional stress analysis and a parametric study of retaining piles. A baseline case was established as the foundation for simulation analysis. The road collapse in this case was attributed to a rising groundwater level caused by continuous rainfall. This
study examines the variations in stress distribution and safety factors in pile design under different groundwater table depths. Simulations were conducted for scenarios with and without cantilever-type retaining piles to compare lateral displacement differences under various conditions. The results, presented in graphical form, provide valuable insights for engineers involved in road pile design.
Key Words: Retaining pile, numerical model, slope, stress analysis, FLAC