Our measurements inform your decisions



Geotechnical Observations installed SAA displacement monitoring equipment into the concrete retaining walls at Crossrail’s Tottenham Court Road Western Ticket Hall and monitored the deflections of the walls as the soil was removed from inside the resulting box.



The measured deflections were significantly smaller than those that had been predicted using the specified design parameters.


A decision was taken to remove the lowest supporting prop, which facilitated more room for excavating (11m as opposed to 3m) at the bottom of the excavation and reduced the programme by this saved 28 days on the programme. This brought about a saving of £715,000 after taking account of the cost of the monitoring (approximately £200,000).

-  “Not all companies have an understanding of products and the results that come out but Geotechnical Observations do.”

-  “They don't offer anything to the client until they know that they can make it work and seamlessly help the client.”

-  “If there is ever a problem they are keen to solve it, wouldn't just leave it - very invested in the service that they provide.”

Find out more about the impact of monitoring and how we can help you by getting in touch.