Tunnelling-induced response of a jointed pipeline and its equivalence to a continuous structure

摘要

The response of a jointed pipeline to tunnelling-induced ground settlement relies largely on the soil-pipe interaction. An analytical solution incorporating the Pasternak model is formulated here to estimate a jointed pipeline's deflection and bending moment. Subsequently, a procedure is proposed to transform the jointed pipeline to an equivalent continuous structure for a deflection evaluation. Case studies are conducted to verify the analytical solution, followed by parametric studies to assess the effects of the Pasternak model's parameters and the pipe joints. The analytical solution is validated by the experimental results in the literature. The parametric studies show that the number and distribution of the joints have a mild effect on the pipe deflection, whereas their influence on the pipe bending moment is significant. Similarly, the pipe bending moment is more sensitive than the pipe deflection to subgrade shear stiffness. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.