盾构管片接头转动刚度衰减对衬砌的影响分析

发布时间：2018-05-03 22:08

本文选题：盾构法隧道 + 管片接头　；参考：《郑州大学》2017年硕士论文

【摘要】：盾构法隧道施工具有交通干扰小、施工速度快、便于机械化施工等等优点,在城市地铁建设中发挥着越来越大的作用。盾构法隧道采用预制管片拼装而成,管片接头本身就是盾构管片环的薄弱部位,而盾构隧道渗水、漏水、衬砌掉块、材料劣化等也都会削弱管片和管片接头的力学性能。接头力学性能主要受到转动刚度的影响。接头转动刚度对管片环的变形和内力都有非常大的影响。因此,研究接头转动刚度衰减对盾构管片环的影响,具有非常重要的意义。本文通过对盾构管片环数值分析,分析管片接头转动刚度衰减对管片环的影响,进行了以下研究工作:(1)根据梁-弹簧模型理论建立考虑接头效应的有限元模型。管片用梁单元模拟,管片分块之间的接头等效为弹簧连接,接头处的力学效应由弹簧的转动刚度控制。与惯用法内力计算结果对比,验证了接头有限元模型的合理性。(2)针对单接头和双接头两种分析工况,在接头有限元模型的基础上,研究了接头转动刚度衰减对盾构管片环的影响,总结了接头转动刚度衰减过程中转角和内力的变化规律。(3)研究单接头和双接头转动刚度分别衰减对最大正负转角、弯矩影响最大的单接头或者双接头,以及影响程度。(4)研究了单接头和双接头转动刚度衰减过程中,管片环参考位置处弯矩的变化规律。
[Abstract]:Shield tunneling has the advantages of less traffic interference, faster construction speed and more convenient for mechanized construction. It plays a more and more important role in urban subway construction. The shield tunnel is assembled with prefabricated segments, and the segment joint itself is the weak part of the shield segment ring, and the mechanical properties of the segment and segment joint will be weakened by the seepage, leakage, lining loss and material deterioration of the shield tunnel. The mechanical properties of the joints are mainly affected by the rotational stiffness. The rotation stiffness of the joint has a great influence on the deformation and internal force of the segment ring. Therefore, it is of great significance to study the effect of joint rotational stiffness attenuation on shield segment ring. Through numerical analysis of shield segment ring, the influence of segment joint rotational stiffness attenuation on segment ring is analyzed. The following research work is carried out: 1) based on the beam-spring model theory, a finite element model considering joint effect is established. The segment is simulated by beam element. The joint between segments is equivalent to spring connection, and the mechanical effect at the joint is controlled by the rotational stiffness of spring. Comparing with the internal force calculation results of the inertia method, the rationality of the finite element model of the joint is verified. (2) the finite element model of the joint is based on the finite element model of the joint, aiming at two kinds of analysis conditions of the single joint and the double joint. The effect of joint rotational stiffness attenuation on shield segment ring is studied, and the variation of rotation angle and internal force during joint rotational stiffness attenuation is summarized. The variation of bending moment at the reference position of segment ring is studied in the process of single joint and double joint rotation stiffness attenuation.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43

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