Analysis Of Secant Pile Wall As Deep Excavation Support System In Silty Sand Soils Incase Of Hawassa Town

Abstract

Control of soil deformation is critical for deep excavation in crowded urban areas to minimize its effect on adjacent structures. Therefore, analysis and parametric study is important for accurately represent the response of the soil to excavation and to predict the magnitude and pattern of ground movement. This thesis presents the analysis of secant pile walls as deep excavation support system in silty sand soils. The objective of this study is to investigate and realistically simulate the effect of different parameters on the prediction of ground movement by numerical analysis and to develop a method of estimating these effects quantitatively. Relevant literatures published in the past were extensively conducted in order to understand the trends and the key developments in this area. It was revealed from the literature review that the concurrent use of the observational method and the finite element method for monitoring and controlling of ground deformations around the excavation has become a norm for deep excavation projects During analysis Parametric study was conducted for the effect of surcharge and its location on horizontal displacement, vertical deformation and bending moment of the supporting system. From the study, analysis results and discussions are presented with details of constitutive models used during deep excavation and provide helpful first estimation of probable damage caused on adjacent structures due to excessive excavation was also presented. Lastly, Recommendations for future works are presented.