Stress distribution in tunnel openings constructed using the sprayed concrete method in London clay

M. L. Walker,C. Paraskevopoulou, J. Su

PROCEEDINGS OF THE ITA-AITES WORLD TUNNEL CONGRESS 2023, WTC 2023: Expanding Underground-Knowledge and Passion to Make a Positive Impact on the World(2023)

Cited 0|Views1
No score
Abstract
Numerical models of tunnel openings constructed using the Sprayed Concrete Method (SCM) typically utilise plate elements to reproduce the concrete lining behavior. Plate elements rely upon the plane stress assumption, which can result in overly conservative values of stress as indicated by the recent fibre optic strain monitoring by De Battista et al. (2015). This study presents an alternative approach to modelling of SCM constructed tunnel openings incorporating discrete volume elements for the primary and thickening layers of concrete. A series of three-dimensional finite element analyses have been completed using model parameters informed by tunnel openings constructed for London Crossrail. Comparison is made between results from models incorporating plate and volume elements. Findings confirm reduced maximum stress values around an opening using the volume element method. The results of the modelling approach corroborate baseline statements made by De Battista et al. (2015) based on field fibre optic strain monitoring.
More
Translated text
AI Read Science
Must-Reading Tree
Example
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined