STRUCTURAL ANALYSIS STUDY ON SEGMENTAL LINING TUNNELS USING ANALYTICAL AND NUMERICAL METHODS

• Main Author: Baihaqy Noor, Fikri
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/81577
• Institution: Institut Teknologi Bandung

Segmental lining tunnels constructed using the Tunnel Boring Machine (TBM) method consist of several concrete segments joined with longitudinal and circumferential joints. Several structural analysis methods, including analytical solutions and numerical approaches, have been developed for the design of segmental lining in tunnels. However, Indonesia currently lacks a code or standard that can be used as a reference for tunnel design. Additionally, there are few comprehensive studies discussing the use of tunnel design methods and approaches for case studies in Indonesia. The analysis of seismic effects on underground structures, such as tunnels, differs from that of surface structures, given that underground structures are constrained by the surrounding medium (soil or rock). The aim of this study is to understand the response/behaviour of tunnels subjected to various loads using both analytical and numerical methods. This study will also assess seismic evaluation on tunnels. Different analytical methods are employed to determine the tunnel's behaviour, namely the Conventional Calculation Method, Curtis Muir Wood, and the Beam-Spring Model. For the seismic analysis, both free-field and interaction approaches are used, for both longitudinal and transverse tunnel analyses. Overall, this study presents the behaviour of tunnels using different methods based on the modelled loads. The comparison of methods indicates that analytical methods produce greater internal forces and deformations compared to numerical methods, due to more detailed modelling assumptions in numerical methods. Seismic analysis of tunnels is based on the free-field deformations occurring in the soil. This study also addresses the seismic impact on both ODE (Operating Design Earthquake) and MDE (Maximum Design Earthquake) conditions. The study demonstrates that, in addition to the characteristics of the concrete segments, the mechanical properties and geometry of the segment joints significantly influence the structural behaviour of segmental tunnel linings.