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修正惯用法作为一种实用的设计计算方法被广泛应用于盾构隧道结构设计领域。其关键参数——弯曲刚度有效率的取值对于计算结果具有至关重要的影响。本文基于荷载结构法,采用有限元方法建立带接头和不带接头的衬砌管片圆环模型。根据弯曲刚度有效率的定义,分析了接头数量、接头角度、接头抗弯刚度和地基抗力系数对于弯曲刚度有效率的影响。研究表明当接头数量较少,接头刚度较大和地基抗力较大时,弯曲刚度有效率较大。同时,不同的接头角度对于弯曲刚度有效率也存在明显影响。根据数值模拟结果,给出了盾构隧道结构的弯曲刚度有效率计算方法。该方法综合考虑接头数量、接头角度、接头抗弯刚度和地基抗力系数对弯曲刚度有效率的影响。一系列计算对比验证了该计算公式具有较广的适用性和较高的准确性。
As a practical design and calculation method, modified idiom is widely used in the design of shield tunnel structure. The key parameter - the value of bending stiffness efficiency is crucial to the calculation results. Based on the load structure method, the finite element method is used to establish the annular model of lining segment with and without joints. According to the definition of effective efficiency of bending stiffness, the influence of the number of joints, the angle of joints, the bending stiffness of joints and the coefficient of foundation resistance on the efficiency of bending stiffness are analyzed. The results show that bending stiffness is more efficient when the number of joints is smaller, the joint stiffness is larger and the foundation resistance is larger. At the same time, different joint angles have obvious influence on the bending stiffness efficiency. According to the numerical simulation results, an effective method to calculate the bending stiffness of the shield tunnel structure is given. The method takes into account the influence of the number of joints, the angle of joints, the bending stiffness of joints and the coefficient of foundation resistance on the efficiency of bending stiffness. A series of computational comparisons verify that this formula has wider applicability and higher accuracy.