盾构管片结构的力学行为分析

Mechanical behavior analysis of shield segment structure

基于弹性理论建立了管片结构环向刚度模型以及管片环向内力模型,并对管片接头部位的各相关参数进行了分析。研究结果表明,管片结构内力模型的理论计算结果与有限元计算结果相吻合,具有较高的精度。刚度计算模型能准确地揭示出管片结构环向变刚度的分布规律。环向最大正弯矩会随着管片接头处刚度的降低而增加。环向弯矩的分布状态也会随着接头数量和锲块位置的改变而改变。

A circumferential rigidity model and a circumferential inner force model of the shield segment were built based on the elasticity theory,and some related parameters of the segment joint were analyzed.The results showed that the inner forces calculated by the theoretical model coincide with the results by the finite element method,demonstrating a high accuracy.The rigidity model can reveal exactly the circumferential rigidity distribution in the shield segment structure.The maximal circumferential positive bending moment increases along with the reduction of the segment joint rigidity.The distribution of the circumferential bending moment changes with the changes of the joint number and the K block position.