地震荷载作用下大坂盾构隧道管片配筋校核

将盾构隧道管片视为分段曲梁、管片之间为铰接关系、管片与地层之间为非线性接触关系，边界采用无限元吸收地震波的反向与折射，地层服从Mohr-Coulomb弹塑性本构模型，地震波采用EI-Centro波，采用地层-结构法，应用隐式动力有限元分析地震荷载作用下管片轴力与弯矩分布情况。根据有限元计算结果，结合结构力学方法，校核管片配筋是否合理。与荷载结构法相比，其方法可模拟围岩与管片、管片与管片之间的相互关系，并可考虑锚杆等支护结构对管片受力的影响，因而，计算结果更为精确。研究为盾构隧道管片配筋优化设计，降低隧道支护成本，提供了一种管片配筋校核计算方法与设计依据。

Reinforcement check of Daban shield tunnel segment under seismic loads

Taking the shield tunnel segment as a section curved beam, the segment was articulated each other and contacted nonlineariy with the rock stratum. Infinite element was used to absorb the reflection and refraction of seisminc waves in boundary; the Mohr-Coulomb elastoplastic constitutive model and EI Centro seismic wave were used; an implicit dynamic finite element analysis of axial force and bending moment distributions under seismic loads was conducted by stratum structure method. According to the finite element analysis results, the reinforcement of the segment is checked combining with structural mechanics approach. Comparing with the load-structure method, the proposed method can simulate the relationships between the segments, segment and surrounding rock; the supporting structure such as bolt can also be considered; so the method can give more accurate results. The research provides a method of checking calculation and design basis for the optimization design of the shield tunnel and reduces the cost of the support.