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Instrumentation key to LUL value engineering

Monitoring and instrumentation is playing a key role in allowing London Underground to efficiently maintain its geotechnical assets claims Transport for London principal geotechnical engineer Dr Nadar Saffari.

Speaking at yesterday’s GE Instrumentation and Monitoring Conference, Saffari outline how LUL uses long term monitoring of earthworks structures and rainfall patterns to check and predict stability.

“We have over 463km of track route with 239km of earthworks structures on the network. Many are over 100 years old and those in London Clay exhibit stability problems,” he said.

Saffari said that monitoring was a key part of the decision process when it comes to undertaking remediation work and through long term slope stability surveying and checking local rainfall from Met Office data, it is often possible to predict when failure becomes more likely in some areas.

“The information means that it is easier to present the business case for stabilisation,” he said. “Also, when the decision is made to stabilise the slope, we have a much clearer understanding of the failure mechanisms.”

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