Interaction between Tunnel Surrounding Rock and Support

Combined with the construction of a tunnel and using viscoelastic theory,the interaction between tunnel surrounding rock -early support and second lining has been studied,and the load distribution ratio and stress in tunnel surrounding rock -early support and stress in second lining have been calculated in this paper.Firstly,the analytical expression equation of the stress and displacement in tunnel surrounding rock -early support and second lining during the process of circular tunnel construction have been derived by using linear viscoelastic theory.Secondly,the interaction between tunnel surrounding rock -early support and second lining,and load distribution ratio have been derived by compatibility of deformation.The results show if surrounding rock -early support be simulated with viscoelastic fluid then the second lining must be supported whole surrounding rock pressure,and if surrounding rock -early support be simulated with viscoelastic solid then the second lining only be supported a pat of surrounding rock pressure.Finally,the load distribution ratio,displacement and stress in tunnel surrounding rock -early support,displacement and stress in second lining have been calculated by surrounding rock -early support to be simulated with Poyting-Thomson three-parameter solid rheological model and second lining to be simulated with elastic solid,and the displacement and stress in the second lining under different load distribution ratio have been given. These can be provided a reference for the construction and design of the tunnel.