Tunnel induced ground movement

Abstract

A tunnel construction facing high risk and being a major concern in the construction of underground structure especially for their stability and settlement. This dissertation study on the influence of various jack forces magnitude to the soiltunnel reaction especially on the tunnel lining behavior and induced ground settlement at various depth above the tunnel crown. In addition, this research also discuss on the tunnel’s global behavior in order to support the surrounding load. A series of soil-tunnel modelling were carried out using ABAQUS as a finite element method (FEM) software. A stand-alone ring method together with all-in-once method was used in this study to simulate the Singapore MRT Circle Line 3 (CCL3). Based on the results obtained and the assessment made in this study, it can be concluded that jack forces of 5 Mpa, 10 MPa,15 Mpa and 20 Mpa shows not significant ground settlement. The soil settlement at various depth show different ground settlement. One of the significant output from this study is one able to manage effectively the tunnel-soil reaction without significant or critical deformation and allow the tunnel to be used in stable and safe condition with deeper understanding of the jack force variations.