Unsupported browser

For a better experience, please update your browser to its latest version.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

Technical paper: Evaluation of prop loads at Channel Tunnel Rail Link Contract 430 – Ashford tunnels

Fleur Loveridge, Mott MacDonald. This paper was first published in GE’s August 2001 edition.

Conventional design methods for braced excavations are commonly found to overestimate the prop loads measured during subsequent construction (Powrie & Batten, 2000, Twine 8r Roscoe, 1999). This may result in the over-design of support systems. The distributed prop load (DPL) method provides an alternative method of estimating temporary prop loads based on case histories.

This paper compares loads found using the DPL method and those given by conventional wall analysis with loads measured during the early stages of construction of the Channel Tunnel Rail Link (CTRL) Contract 430. It demonstrates that the DPL loads are greater than those measured, but significantly less than those found by analysis. The DPL method is then applied to forthcoming areas of construction. The subsequent reduction in prop load predictions allowed review of the method of propping and resulted in cost savings of approximately f.175,000. 

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Links may be included in your comments but HTML is not permitted.