盾构管片接头破坏类型及参数敏感性分析

Failure type and parameter sensitivity analysis of shield segment joint

盾构管片接头是整环管片力学性能的薄弱部位,容易发生破坏。通过分析盾构管片接头的受力特性、管片接头的破坏类型以及管片内力和其影响因素之间的关系,再进行人工神经网络敏感性分析,计算得到不同影响因素的相对重要性指数大小。研究结果表明:盾构管片接头的破坏类型为受拉破坏;管片外径(RI=54.4%)对管片最大拉应力影响最大,其次是围岩等级(RI=35.3%),隧道埋深和混凝土强度对管片最大拉应力影响较小,相对重要性指数RI小于6%。

The joints of the lining structure, the weak and key parts of the mechanical properties, are the most vulnerable parts of the whole segment. In this paper, the internal force characteristics of the shield segment joint, failure type of segment joint and the relationship between the tensile stress of the shield segment and influencing factors are presented. An artificial neural network (ANN)-based sensitivity analysis was performed to obtain insight into the relative importance of the influencing factors. The results indicates that the failure type of the pipe joint is tensile failure. The diameter of shield segment and the grade of surrounding rock are the primary influencing factor with RI=54.4% and RI=35.3%, respectively. The tunnel depth and strength of concrete are the secondary influencing factors with RI less than 6%.