TY - THES

T1 - Numerical Methods for Tunneling using ABAQUS and Investigations of Long-Time-Effects of the Shotcrete Shell and its Impact on the Combined Support System

AU - Mödlhammer, Heiko

N1 - embargoed until null

PY - 2011

Y1 - 2011

N2 - This thesis uses the finite element method to investigate the effect of tunnel support deterioration on the performance of tunnels. First, different methods to simulate tunnel excavation and the installation of a dual-lining system (primary shotcrete shell / secondary cast-in-place concrete inner lining) using the general-purpose finite element program ABAQUS are discussed. The second aim of this study is to understand the influence of long-time deterioration of tunnel supports and its impact on the stability of the combined support system (surrounding ground, shotcrete shell and inner liner). Using a parametric study, different deterioration processes are simulated, assuming elastic as well as elasto-plastic material behavior. This includes the simulation of tunnel excavation, the interaction between the shotcrete shell and the ground, and the interaction between the shotcrete shell and the inner lining. This allows one to interpret the main characteristics of the analyzed deterioration processes on the basis of the obtained stress distributions and displacements of the support elements.

AB - This thesis uses the finite element method to investigate the effect of tunnel support deterioration on the performance of tunnels. First, different methods to simulate tunnel excavation and the installation of a dual-lining system (primary shotcrete shell / secondary cast-in-place concrete inner lining) using the general-purpose finite element program ABAQUS are discussed. The second aim of this study is to understand the influence of long-time deterioration of tunnel supports and its impact on the stability of the combined support system (surrounding ground, shotcrete shell and inner liner). Using a parametric study, different deterioration processes are simulated, assuming elastic as well as elasto-plastic material behavior. This includes the simulation of tunnel excavation, the interaction between the shotcrete shell and the ground, and the interaction between the shotcrete shell and the inner lining. This allows one to interpret the main characteristics of the analyzed deterioration processes on the basis of the obtained stress distributions and displacements of the support elements.

KW - Finite Element Method

KW - ABAQUS

KW - Dual-Lining System

KW - Long-Time Deterioration of Tunnel Supports

KW - Shotcrete Shell

KW - Inner Lining

KW - Finite Elemente Methode

KW - ABAQUS

KW - zweischaliger Tunnelvortrieb

KW - Langzeit-Verwitterungsprozesse bestehender Tunnelauskleidung

KW - Spritzbeton

KW - Innenschale

M3 - Master's Thesis

ER -