RESEARCH ON INFLUENCE OF SHIELD TUNNEL CONSTRUCTION ON DEFORMATION AND SECONDARY INNER FORCE OF CONSTRUCTED PARALLEL TUNNEL
盾构隧道施工对已建平行隧道变形和附加内力的影响研究

Taking the assembly lining structure of shield tunnel as object of study,the continuum material model with the tunnel circumferential and longitudinal stiffness being discounted is introduced based on equivalent deformation principle.With the Dali interzone of the project Guangzhou metro line 3 as research background,laboratory model test and 3D finite element analysis are both applied to the research on the influence of shield tunnel construction on the constructed parallel one.The longitudinal secondary,longitudinal additional axial force and bending moment,circumferential deformation,circumferential secondary axial force and bending moment of the constructed tunnel brought by the newly parallel one are investigated.Factors such as surrounding soil,clear distance,jacking force,etc.,are also discussed in the distribution and variation of displacement and secondary inner forces of the constructed tunnel during shield tunnel construction.The results indicate that the influence of the newly constructed tunnel mainly occurs on the hance of the constructed tunnel close to the new one,that it is necessary to keep a certain clear distance between two tunnels in the weak stratum and that the jacking force of the shield should be controlled in a certain range,according to surrounding soil,clear distance,possible displacement,relative deformation and secondary inner forces.