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Experimental and numerical modelling of stress redistribution due to construction of cross passages of shallow tunnels.

Project Leader

Wu Wei, Project Leader

Duration:

30.06.2021-29.06.2024

Type of Research

Basic Research

Staff

BOKU Research Units

Institute of Geotechnical Engineering

Funded by

Austrian Society for Geomechanics, Innsbrucker Bundesstrasse 67, 5020 Salzburg, Austria

Abstract

This project deals with the centrifuge model tests on the behaviour at tunnel cross-passages. Long tunnels usually consist of two main tunnel tubes, which are connected by cross-passages in certain distances. The connection between the main tunnel and the cross-passage presents a three-dimensional problem. We use centrifuge model tests to study the stress and strain at the tunnel connection.

The structural analysis of the tunnel tube in the area of the cross passages are usually carried out during the preliminary design stage. Due to the complex three– dimensional stress–strain field at the intersection between main tunnel and cross passages, analytical calculations are not feasible and the literature provides little to no guidance. The design practice is usually based on simplified two–dimensional calculations supplemented by some instrumentation (monitoring). However, simplified 2D calculations cannot account for the complex interaction between the ground and lining, monitoring is mostly performed ex–post and data interpretation is not straightforward. The aim of this research project is to close this knowledge gap.

Keywords

Structural dynamics; Geotechnics; Tunnelling;

centrifuge model tests on the behaviour at tunnel cross-passages;