Design and performance of a basement in Norwich, UK

The design, construction and monitoring of a 12 m deep basement for the Chapelfield Shopping Centre, Norwich, UK are reviewed. The extent to which data and reports from similar nearby construction projects allowed cost savings and reduced risks, particularly regarding solution features in the chalk, has been assessed. By having robust engineering solutions and contingency measures agreed at the start of construction, geotechnical works for the project were completed without delays or significant additional costs. Back-analysis has shown a good fit between actual performance and that predicted using the soil parameters chosen. Using hindsight, an assessment is made of whether all potential benefits from the prior knowledge of the performance of similar excavations in the area were realised.