Abstract
General elastic solutions for tunnel deformations due to a nearby basement excavation are presented for jointed rock masses that contain two orthogonal joint sets. The method used to obtain these solutions involves a boundary element formulation for planar problems in anisotropic elasticity. The numerical solutions presented here allow predictions to be made of the changes in key tunnel dimensions, i.e. measures of the tunnel distortion, as the basement is excavated over a range of depths. Data that is typical for tunnels, basements and rocks in the central business district of Sydney have been used to illustrate the use of these solutions in geotechnical engineering.
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