HS2 Chiltern Tunnels

United Kingdom

Advising on groundborne noise and vibration for the longest tunnels on the HS2

The Chiltern Tunnels are a set of twin bore tunnels 16km long that form part of the HS2. They are the longest tunnels of the HS2, carrying the railway line under the Chiltern Hills northwest of London.


  • The Challenge

    Our client required a team to advise on all technical aspects associated with groundborne noise and vibration during sub-surface tunnel construction activities.

  • Our Approach

    Our team of experts:

    • Conducted screening risk assessments.
    • Performed detailed finite difference modelling of vibration propagation through the chalk strata from the use of Tunnel Boring Machines (TBMs) and from activities involved in the construction of cross passages.
    • Assisted with community and local authority engagement activities prior to the arrival of the TBMs at sensitive receptors overlying the tunnels.
  • The Outcome

    RWDI has completed comprehensive on-site surveys of both groundborne noise and vibration at numerous locations to determine prediction confidence levels and re-calibrate predictions. Sites surveyed have included residential communities, listed buildings, commercial and office premises, and a large hospital.