ANALYSIS OF LATERAL EARTH PRESSURE DISTRIBUTIONS WITH NUMERICAL AND ANALYTICAL METHODS: THE CASE OF BRACED DEEP EXCAVATION IN ADDIS ABABA CITY

Abstract

The lateral earth pressure distributions caused by braced deep excavation are paramount important to determine in order to assure both safety against displacement, settlement and bending moment of the ground and support systems. The study of the effects of braced deep excavations in different soil types which is located in Kirkos Sub City was presented in this paper. The main objective of this thesis is to investigate the effects of change in soil type and structural parameters on the performance of deep excavation support system and adjacent ground. The parameters considered as an input in software are soil type, excavation depth (12 m, 16 m, and 20 m), embedment depth, stiffness, strut and walling spacing, anchors and grouting. Following this the numerical analysis was proven by experiment as a useful tool for analysis. The results showed that as parameters were varied the recorded average value of the maximum and minimum horizontal displacements of the ground and SPW, , M1-1 and M2-2 were 0.3643 m - 0.03169 m, 0.4891m - 0.03772m, 0.317m - 0.029m, 4237KN m - 85.55KN m and 2061KN m - 14.40KN m respectively. The comparison of empirical and numerical method of analysis result shows that the maximum is recorded by Peck whereas the minimum is recorded by PLAXIS-3D analysis. But the maximum is recorded by PLAXIS-3D whereas the minimum is recorded by Pecks method. Finally, the overall precious summary and sufficient conclusion were made for exact design of braced deep excavation and its retaining system