GROUND MOVEMENT AT DEPTH IN LONDON CLAY

Building damage caused by ground settlement above tunnels can have an important influence on tunnelling projects. The consequences of a part icular tunnelling technique on building damage can be predicted by a s equential process: estimation of surface settlement, settlement at eff ective foundation level, building response and cost of mitigation or r epair. The accuracy of any estimate for building damage is directly re lated to the accuracy of each step of this process. In recent years th e amount of high quality field measurement of settlement as a function of depth has increased, Subsurface measurements of centre-line settle ment have been taken in several locations, By application of these mea surements and development of established theory a simple and accurate model of settlement as a function of depth in London Clay can be devel oped.