Synthesis of numerical methods for the design of segmental tunnel lining

Rim Trad,Hussein Mroueh,Hanbing Bian,Fabrice Cormery

doi:10.1051/matecconf/201929503008

Abstract

This paper presents a numerical study that aims to compare the behavior of the segmental tunnel lining using the direct, indirect and experimental methods. This model is based on a practical case applied in university of Tongji: a project of water conveyance tunnel. A reduction in the bending moment and increasing of the displacement in the tunnel lining is showed in numerical results, when taking into account the effect of the joints. It has been shown that the number of joints in the tunnel-lining structure highly affects the results in terms internal forces and displacements. Furthermore, the internal forces obtained by the continuous method are high compared to the other methods when the effects on segmental joints on tunnel lining behaviour are usually considered. Additionally, the bending moment of the direct method with behaviour of rotation spring linear and experimental method is comparable.

Highlights

The mechanized shield tunnelling method has become more and more popular for the construction of tunnels in recent periods due to its flexibility, cost effectiveness and minor trouble to the surrounding ground [19]
It is observed that the bending moments obtained by the continuous method are higher than those of the direct and experimental methods where the effects on the joints between the segments are taken into account (Fig.5.)
Different methods are applied on a finite element model and compared with the experimental results got in the project of Tongji University

Summary

Introduction

The mechanized shield tunnelling method has become more and more popular for the construction of tunnels in recent periods due to its flexibility, cost effectiveness and minor trouble to the surrounding ground [19]. A research program at Tongji University [22] has been conducted to study the three-dimensional effect through full-scale loading tests on a staggered-fabricated threering structure for rain-water storage and transportation tunnel. Based on their preliminary results, we propose in this paper a comparative numerical analysis of segmental lining modelled as uniform or discontinued segments, either by continuous, indirect and direct https://doi.org/10.10 51/matecconf /201929 503008 methods. In this model, in addition from the soil pressures and the normal external water, inner hydrostatic pressures will applied during strong storms. Results are compared with experimental results obtained from the project of Tongji University [22]

Objectives

Methods

Results

Conclusion