||The study of behaviour induced by EPB tunneling in Bangkok MRT Blue Line extension Project
||Department of Civil Engineering
MRT Blue Line extension
Hardening Soil model
cohesive and non-cohesive soil
The impact of the ground deformation is one of serious tunneling issues, specifically beneath the urban area. The aim of this thesis is first to explain a ground profile and parameters, which are suitable with MRT Blue Line extension project in Bangkok, Thailand. Secondly, the finite element approach using Plaxis program with Hardening Soil model was conducted to simulate both two-dimensional and three-dimensional tunnelling model. Moreover, the new method named semi-3D was proposed to predict the behaviour of Bangkok soil influenced by the tunnel excavation. This paper represents good coherent results between field measurement data and numerical results for both short-term and long-term surface settlements. Especially, the two-dimensional the back-calculated percentage of volume loss and contraction are compared with simulation results. Finally, the numerical outcomes were also compared with the cohesive and non-cohesive soil in Taipei and Kaohsiung.
Table of Contents
1. Introduction 1
1.1. Background and Motivation 1
1.2. Objectives 3
1.3. Thesis Outline 4
2. Literature Review 6
2.1. Tunnelling Method 6
2.2. Soil Behaviour in Soft Ground induced by Tunnelling 11
2.3. Prediction Methods for Ground Responses occurred by tunnelling 13
3. Tunnels in Bangkok and the Project Selected for Research 22
3.1. Overview of the MRT Blue Line and its extension in Bangkok 22
3.2. Geological Condition in Bangkok 24
3.3. Previous research about tunneling works in Bangkok area 26
3.4. Research Data Collection and Process 31
4. Performances of tunnelling in Bangkok 32
4.1. Observations 32
4.2. Empirical prediction 35
4.3. Software and constitutive model used for finite element analysis (FEA) 37
4.4. Parametric study 60
5. Conclusions and recommendations 66
Appendix A 70
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