Ground movement due to shaft construction

摘要

Ground movement due to shaft construction can damage surrounding assets. A comprehensive synthesis of case studies of ground surface movement due to the excavation of circular shafts is presented herein. The data highlight the importance of considering shaft construction method when making empirical predictions.After subtracting significant settlement due to dewatering, two shafts at Crossrail's Limmo Peninsula tunnelling site have been added to the existing data set. This has confirmed that when wall installation occurs prior to excavation, shafts typically experience less ground surface settlement than when installation and excavation are concurrent.New design lines which differentiate between construction method are presented.