Abstract
In case of the design of the neighbouring construction of tunnel, it is necessary to take into account of the influences of tunnelling on the pre-existing structures. These influences are experimentally investigated using model test apparatus of a pair of tunnels. Stacks of the aluminium rods are used as the model materials of the ground and the stress states within the model tunnel made of photoelastic material (Epoxy resin) are analysed. The change of the pressure applied to the model tunnel is also examined using the numerical results obtained from the boundary element analysis. It is shown that the vertical pressure applied to the pre-existing tunnel is increased by 5% of its initial value and the horizontal value is decreased by 13%.
