Assessment of Slope Stability Considering Pile Effects: A three-dimensional Finite Element Analysis using PLAXIS-3D

Abstract

This thesis focuses on the analysis of slope stability and the effectiveness of pile reinforcement in enhancing slope stability. The comparison between the Limit Equilibrium Method (LEM) using SLOPE/W software and the Finite Element Method (FEM) using PLAXIS-3D software is conducted to evaluate their performance in analyzing slope stability. Factors such as factor of safety (FOS), pile diameter, pile spacing, and soil properties are investigated to understand their impact on slope stability. Extensive literature review is performed, encompassing studies on piled slopes, slope stability analysis, numerical modelling, and the application of PLAXIS-3D in geotechnical engineering. Case studies and experimental validation provide insights into real-life scenarios, validating the accuracy and reliability of numerical models. The results indicate that both software options yield comparable results, with PLAXIS-3D slightly outperforming SLOPE/W. The insertion of piles improves the factor of safety, with the number of rows and pile diameter directly influencing the stability. Optimal design recommendations include the use of 1m diameter piles at a spacing of 3m to 5m for construction purposes. The factor of safety is influenced by cohesion and friction angle, with an increase in cohesion and a moderate increase in the friction angle leading to improved slope stability. This research contributes to the ongoing debate surrounding slope stability analysis and provides valuable insights for geotechnical engineers involved in slope stabilization projects.