2-dimensional analysis of settlement damage to masonry buildings caused by tunnelling

Abstract

In current practice, estimating the effects of tunnel construction in soft ground beneath an existing building is usually a two-stage procedure, where interaction between the ground and the building is ignored. This paper describes a study of tunnelling-induced settlement damage to masonry buildings, using a numerical model, in which interaction is included. 2-dimensional finite elements(FEs) are used with non-linear material models for the soil and for a masonry facade. The excavation of a tunnel is simulated, and the resulting damage in the facade, principally cracking, can be observed. This study concentrates on the effect of facade weight and stiffness and the horizontal location of the facade with respect to the tunnel axis. The study finds that increasing facade weight tends to increase damage, owing to the larger horizontal strains. Increasing facade stiffness, however, appears to reduce damage, since the differential settlements under the facade are inhibited