Assuming that the foundation soil of the immersed tunnel in soft soil areas was a three parameter Kerr model,and the immersed tunnel pipe joint was equivalent to a Timoshenko beam,a simplified calculation model of the immersed tunnel was established by using vertical and rotating springs to simulate the pipe joint.Based on the Timoshenko beam theory on Kerr foundation,an analytical expression for the overall structure of immersed tunnels was derived.By comparing the numerical simulation results based on spatial entity finite element,the pa-rameters in the Kerr foundation model were determined reasonably and the sensitivity factors of soil thickness and compressive modulus on the Kerr foundation model were analyzed.The results show that reasonable Kerr foundation model parameters can make the longitudinal deformation results of immersed tunnels consistent with reality.In addition,an increase in soil layer thickness and a decrease in soil compression modulus on Kerr foun-dation will both lead to an increase in longitudinal deformation of the entire structure of the immersed tunnel and bending moments at the two ends of the immersed tunnel.
关键词
沉管隧道/Kerr地基模型/Timoshenko梁/纵向变形/弯矩
Key words
immersed tunnel/Kerr foundation model/Timoshenko beam/longitudinal deformation/bending mo-ment
维普
万方数据