Reliability-Based Design of Pile Foundations in Layered Soil

Abstract

The design of pile foundations founded on reliability principles within layered soil constitutes a significant issue in the field of geotechnical engineering. This research thesis seeks to enhance the formulation of a methodology dedicated to the reliability-oriented design of pile foundations in layered soil, whilst addressing the uncertainties pertaining to soil characteristics and applied loads. The methodological approach employed in this research incorporates finite element analysis (FEA) alongside reliability analysis to investigate the performance of pile foundations situated in layered soil. The investigation initiates with a thorough examination of existing literature concerning the reliability-based design of pile foundations in layered soil. This literature review underscores the imperative for a more resilient and precise design framework that integrates the uncertainties linked to soil characteristics and loads. The total displacement recorded for a load of 1000 KN is 2 mm, which increases to 3 mm when subjected to a load of 1500 KN .Upon reaching the maximum tested load. These results imply that settlement is significantly influenced by the consistency of the soil. Thereafter, the research advances towards the development of a finite element analysis model, which emulates the performance of pile foundations in layered soil. This model meticulously accounts for the effects of soil stratification, as well as the parameters of pile length, diameter, spacing, and the magnitude and distribution of loads. To ascertain its validity, the finite element analysis model is subjected to validation through comparison with experimental data derived from prior investigations. Subsequently, a reliability analysis is conducted to assess the likelihood of failure concerning pile foundations situated in layered soil. This reliability analysis incorporates the uncertainties associated with soil properties and loads, thereby providing a measurable assessment of the safety margin inherent in the design of pile foundations. In summary, this research thesis advocates for a holistic methodology for the reliability-based design of pile foundations within layered soil. The proposed methodology acknowledges the uncertainties related to soil characteristics and loads, thereby offering a more precise and resilient approach to design. Geotechnical engineers may utilize this methodology to formulate designs for pile foundations in layered soil that are both secure and dependable.