列车荷载下地铁管片及接头动力响应及疲劳寿命研究

发布时间：2018-05-17 06:45

本文选题：盾构隧道 + 动力响应　；参考：《中南大学》2014年硕士论文

【摘要】：随着我国地铁建设快速发展,已经运营地铁里程逐年增加,地铁隧道服役时间逐渐增长。长期的高密度行车运行,以及修建过程中存在的一些初始缺陷,地铁隧道不可避免的会出现一系列的病害问题,影响其正常使用功能,严重的将危及行车安全。为了满足规范中设计使用寿命100年的要求,开展地铁隧道管片疲劳寿命预测显得尤为重要。本文依托国家重点基础研究发展计划973项目(2011CB013802),运用数值计算方法,对盾构隧道管片及接头动力响应规律及其疲劳寿命预测问题进行了深入研究。主要研究内容及成果如下： (1)分析了结构疲劳破坏发生的机理,详细介绍了常用的疲劳寿命分析方法,归纳总结了已有的疲劳累积损伤理论以及应力-寿命曲线(S-N)确定了适合于盾构隧道的疲劳寿命预测方程。 (2)针对地铁盾构隧道管片结构形式,结合隧道-围岩体系振动理论,建立不同埋深错缝拼装的盾构隧道管片精细化模型。从竖向位移、竖向加速度、动应力三个方面分析了列车振动在盾构隧道管片环向的传递规律,明确了衬砌受列车振动影响较大部位。同时分析了不同埋深情况下衬砌结构不同部位动应力响应变化规律。 (3)建立基底出现脱空的盾构隧道计算模型,分析了不同基底脱空范围对衬砌结构不同部位动应力响应的影响规律及其受影响程度,并将其与埋深造成的影响进行对比分析。 (4)应用疲劳寿命分析软件,对不同埋深、不同基底脱空条件下,盾构隧道疲劳危险部位进行了寿命计算与分析,根据设计寿命要求,对结构是否满足要求进行了判断。
[Abstract]:With the rapid development of subway construction in China, the mileage of subway has been increasing year by year, and the service time of subway tunnel is increasing gradually. Because of the long-term operation of high-density traffic and some initial defects in the construction process, a series of diseases will inevitably appear in the subway tunnel, which will affect its normal use function, and will seriously endanger the safety of driving. In order to meet the requirement of 100 years design life in code, it is very important to predict the fatigue life of subway tunnel segment. In this paper, the dynamic response law and fatigue life prediction of shield tunnel segments and joints are studied by using numerical calculation method, relying on 973 project of national key basic research and development plan (973). The main contents and results of the study are as follows: 1) the mechanism of fatigue failure of structures is analyzed, and the commonly used fatigue life analysis methods are introduced in detail. The existing fatigue cumulative damage theory and the stress-life curve S-N) are summarized and the fatigue life prediction equation suitable for shield tunnel is determined. (2) aiming at the segment structure of shield tunnel of subway, combined with the vibration theory of tunnel and surrounding rock system, the fine model of segment of shield tunnel with different buried depth dislocation joint is established. From three aspects of vertical displacement, vertical acceleration and dynamic stress, the transmission law of train vibration in the annular direction of shield tunnel segment is analyzed. At the same time, the dynamic stress response of different parts of lining structure under different burying depth is analyzed. (3) the calculation model of shield tunnel with void on the base is established, and the influence law and degree of dynamic stress response of different parts of lining structure are analyzed, and the influence caused by the depth of burying is compared and analyzed. 4) the fatigue life analysis software is used to calculate and analyze the fatigue life of shield tunnel under different burying depth and void condition. According to the requirement of design life, whether the structure meets the requirement is judged.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;U231.3

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