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  Numerical analysis of the effects of new building constructions on existing tunnels

  From a general engineering point of view, urban development involves among other things the growth of underground transit systems on one side and the continuous increase of new constructions at the ground surface on the other. Several accurate studies have investigated the effects of tunnelling on nearby existing structures, in order to limit or prevent any possible damage to them. Not quite the same attention has been given to the investigation of the effects of new ground surface constructions on existing underground structures. Building construction works are necessarily associated with a certain amount of soil movement. When these constructions are located close to or directly above existing tunnels, additional induced loads and movements may represent a non-negligible risk for the tunnel linings. The present work analyses the influence of new buildings on existing large diameter tunnels, investigating some important aspects of this soil-structure interaction problem. Results from two-dimensional finite element analyses are presented and both bored as well as cut and cover shallow tunnels are considered. The study refers specifically to tunnels with values of cover to diameter ratios (C/D) in the range one (1) to two (2). Different types of building constructions are considered along with various geometric layouts. Tunnel, Soil-structure interaction, Risk Assessment, 2D Numerical Modelling, Finite Element Method, Non-linear constitutive model.

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