Study on Shear Properties of Bell and Spigot Joint of Precast Utility Tunnels

The bell and spigot joint shear behavior directly affect the safe operation of underground utility tunnels.In order to study the bell and spigot joint deformation with shear loading,numerical model of bell and spigot joint shear and inverse shear were established by ABAQUS finite element software,the joint shear and inverse shear limit load and limit displacement were obtained,and the joint shear stiffness were further analyzed,finally,the influence of axial force on joint shear deformation was analyzed.The results show that the bell and spigot joints deformation law and failure are different under different shear conditions,the joint deformation can be divided into four stages under the shear condition,and joint is ductile failure;but the joint under inverse shear condition can be divided into three stages,and the joint is brittle failure,the joint ultimate shear bearing capacity can be improved by increasing the axial force.The research results provide scientific basis for the design and safe operation of underground utility tunnels.