Field instrumentation has been installed to monitor the behaviour of a contiguous bored pile retaining wall founded in over-consolidated clay during and immediately after its construction as part of the A406 North Circular Road Improvement Scheme in Walthamstow. The construction sequence involved installation of the wall followed by excavation below temporary props and casting of a permanent reinforced concrete prop slab below the final carriageway level. Measurements of ground movements, total lateral stresses, and porewater pressures were made both during installation of the wall and construction of the underpass. The wall was instrumented to monitor the development of lateral movements and bending moments, and the permanent prop was instrumented to monitor loads. (A)
Samenvatting