Assessing the historic movements of buildings - two case studies from the Jubilee Line Extension Project

摘要

There are several well-documented methods for predicting potential building damage caused by underground excavation (e.g. Burland, 1995). In these methods it is generally assumed that the buildings are initially horizontal and have not undergone previous movement. Buildings where it is considered that damage might occur are usually subject to condition and defect surveys prior to the commencement of any underground construction works in the vicinity, to assess their current state in a qualitative manner. Only in exceptional cases are the buildings surveyed accurately to assess whether they have undergone any significant previous movement (e.g.s Anketell-Jones, 1998 and Anketell-Jones & Burland, 2001). Potentially, such deformation could have a significant influence on the way the building behaves when it is subjected to further movement. This paper presents the results of retrospective historical surveys on two buildings at London Bridge, Southwark, southeast London and discusses the deduced past movements in relation to the responses of the structures to the recent Jubilee Line Extension Project underground works.