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First full scale test completed

Posted by gswift on December 6, 2012

The first full scale test has been carried out at Salford, which is a key milestone towards project delivery. This has involved a combination of cyclic loading to replicate, in this case, highway loading conditions. This was followed by a quasi-static load test to failure.

Monitoring of soil pressures on the arch barrel, displacements at a number of locations on the arch, and strains, as well as acoustic emissions and images for PIV analysis, a substantial amount of data has been collected.

In order to maximise the understanding of the behaviour of this complex arch-soil system, a number of further tests were conducted in addition to those initially programmed. For example, after the load test to failure, the arch barrel was 're-set' before being subjected to a number of cycles of loading followed by another load test to failure, in an effort to explore the residual capacity of these structures.


Posted by Marjorie J. Maddox on
Due to advances in numerical modelling, it is possible to capture complex support-ground interaction in two dimensions and three dimensions for mechanical analysis of complex tunnel support systems, although such analysis may still be too complex for routine design calculations. One such system is the forepole element, installed within the umbrella arch temporary support system for tunnels, which warrants such support measures. A review of engineering literature illustrates that a lack of design standards exists regarding the use of forepole elements.
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