Sultan Al Shafian, Md. Nafis Imtiyaz, Mostafiz Emtiaz

Abstract: Being one of the densely populated cities in the world, Dhaka is going through massive changes for infrastructure construction. Various mega projects like underground metro have been undertaken by the government in recent years. This kinds of mega projects certainly need huge excavation works for underground stations, ventilation shaft, launching box and for many other reasons. A careful assessment of the excavation work is required to reduce the risk of failure during construction. Finite element analysis (FEM) can support as an excellent tool to understand the soil behaviour during excavation. As Dhaka has a layer of soft soil in the upper strata, the risks are also higher for these kinds of deep excavation works. This paper analyze a specific section in Dhaka city where future metro rail constructions can take place. An idealized section of a tunnel boring machine(TBM) launching shaft is considered for the excavation analysis where the concrete diaphragm wall has been considered as earth retaining system. Along with deformation, the forces have also been studied to understand the impact due to construction.

Keywords: Deep Excavation, FEM, Plaxis 2D, Constitutive Model, Launching Shaft.

Date Published: August 3, 2023
DOI: 10.11159/ijci.2023.005

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