![]() | Only 14 pages are availabe for public view |
Abstract Analysis of deep braced diaphragm walls subjected to sequential excavations coupling with grouting processes to control hydrostatic pressure and seepage forces of the groundwater outside the diaphragm walls is considered as one of the most sophisticated soil-structure interaction problems. The cut-and-cover construction technique for the construction of subway stations utilizing deep braced diaphragm walls is considered as an effective method for controlling the ground subsidence associated with the construction activities and ensuring the safety measures for the nearby structures and utilities. The main objective of the present study is to numerically evaluate the behavior of a subway station constructed utilizing braced diaphragm walls through typical Greater Cairo water-bearing alluvial deposits. Rod El-Farag subway station, which is one of the Line 2 – of the Greater Cairo Metro, is used in the analysis of the proposed model. Both the soil and the diaphragm walls were extensively instrumented during the construction stages to report the ground subsidence around the station, as well as the mode of diaphragm walls deformation. 2D and 3D finite element analyses were employed to simulate the different stages of construction. The computed back-analyses of the both idealizations were compared with the field measurements compiled during construction phases. Finally, a parametric study concerning some of the important factors which affect the soildiaphragm walls-construction sequence interaction was conducted, and the results were discussed. |