中文摘要：

为了给盾构隧道管片衬砌结构的设计与施工提供参考,针对大断面盾构隧道,采用非线性有限元方法分析地层抗力系数、地层侧压力系数、管片接头抗弯刚度以及管片拼装方式对隧道稳定性的影响,并与失稳破坏相似模型试验结果进行比较,提出基于极限位移和隧道直径变化率的盾构隧道管片衬砌结构失稳破坏判定的建议。研究结果表明：地层条件对隧道稳定性的影响程度最大,管片接头抗弯刚度次之,拼装方式影响最小;地层抗力越小,隧道发生失稳破坏的概率越大,柔性管片接头和通缝拼装方式降低了管片衬砌结构的整体刚度,减弱了隧道的稳定性;管片衬砌结构失稳时处于塑性带裂缝工作状态,失稳类型属于结构稳定性理论中的第二类失稳（极值点失稳）。

英文摘要：

In order to provide references for the design and construction of segment lining structure of shield tunnel,aimed at large cross-section shield tunnel,the influences of strata resistance coefficient,strata lateral pressure coefficient,bending stiffness of segment joint and segment assembling mode on the stability of shield tunnel were analyzed with nonlinear finite element method.Compared with results of the instability failure model test,the instability failure judgment suggestion based on ultimate displacement and diameter change rate for the segment lining structure of shield tunnel was presented.The results show that the influence of strata condition on stability of shield tunnel is first,segment joint bending stiffness is second and segment assembling mode is third.The smaller the strata resistance is,the greater the probability of instability failure of shield tunnel is.The flexible segment joint and straight joint assembling mode will reduce stiffness of the segment lining structure,and weaken shield tunnel stability.The segment lining structure is in the plastic working condition with cracks when the shield tunnel is instable.The instability type belongs to the second category instability（extreme point instability）of structural stability theory.