Heathrow Express - visual representation of
monitoring data against preset trigger levelsAfter the
ground movement predictions and risk assessments have been carried
out a strategy of monitoring and protective measures is developed
to minimise the potential risk or damage due to ground movements
created by sub-surface construction.
Mott MacDonald has considerable expertise in the specification and
use of very accurate and sensitive instrumentation, which is robust
and reliable and can provide remote output in analogue form
together with a ‘real-time’ on-site facility.
This data is used to monitor the amount of movement and assess the
extent of any possible damage, prior to the introduction of
preventative works. The objectives of monitoring during tunnel
construction normally involve
:
- determining ground movements generated as a result of the
construction works along the route
- assessing the effects of settlement generated as a result of
construction works, on existing structures, services and utilities
both above and below ground
- providing settlement data to be used by the tunnelling
contractor for the purpose of assisting a review of working
methods, thus avoiding damage to structures and services
This expertise extends to remote data capture from robotic total
stations, electrolevels, tiltmeters, inclinometers, extensometers,
piezometers and crack gauges in addition to corresponding manual
data collection equivalents.
