What question did this study set out to answer?

The aim is to reinforce the Thames Lee Tunnel to prevent structural failure from HS2 tunnelling activities.

June 15, 2026

HS2 enabling: Thames Lee Tunnel internal strengthening works

OMOwen MillsInstitution of Civil Engineers

Key Points

The aim is to reinforce the Thames Lee Tunnel to prevent structural failure from HS2 tunnelling activities.
Assessment of the Thames Lee Tunnel's structural integrity in relation to HS2's tunnelling activities.
Design and delivery of a structural liner to strengthen the tunnel.
Collaboration between HS2 Ltd and Thames Water for the reinforcement project.
A structural liner was deemed necessary to mitigate risks associated with tunnel boring machine activities.
The design was undertaken by Barhale, utilizing specialist tunnelling and water skills.
The upgraded TLT is now better equipped to handle potential tunnel-induced structural challenges.

Abstract

As part of clearing the way for HS2 (High Speed 2) tunnelling, the Thames Water (TW) Thames Lee Tunnel (TLT) was identified as being within the tunnelling-affected zone. Due to the potential for structural failure caused by factors associated with tunnel boring machine (TBM) activity and the proximity of the TBM path to the TLT, an assessment undertaken by HS2 Ltd and TW identified that a structural liner was required along a section of TLT. Having specialist tunnelling and water skills, Barhale were contracted to undertake design and delivery of a challenging upgrade to reinforce TW’s TLT, a vital source of raw water for East London, against potential damage caused by the passing of HS2’s large TBMs.

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