列车振动荷载下交叉盾构隧道的动力响应特性

发布时间：2018-11-02 14:58

【摘要】：随着我国高速铁路以及盾构法施工的快速发展,在山区和城市出现了大量采用盾构法施工的高速铁路隧道。盾构法施工具有安全、高效、自动化程度高、对周边扰动小等优势,但在盾构隧道中通常会出现较多的交叉结构形式,如联络横通道结构、到发竖井、泵房等,还包括近距离空间交叉的盾构隧道主体结构。因此,本文结合广深港客运专线狮子洋隧道,开展了实测列车振动荷载条件下,联络横通道的隧道交叉结构、近距离空间垂直交叉盾构隧道的塑性损伤理论,和应力、加速度时程分析。主要研究工作和成果如下：(1)阐述了列车振动效应所涉及的相关计算理论,包括：动力学计算原理、混凝土损伤理论、混凝土强度降低理论。并论述了材料阻尼问题、模型动力边界条件、混凝土塑性损伤本构关系等。(2)为了真实的模拟出列车编组在隧道进口段、洞内段、出口段的时间、空间效应,采用了独特的荷载曲线施加方式,将实测列车振动曲线以竖向激振荷载的形式施加在列车轮轴上,同时在列车模型上施加列车自重,二力均由轮轴传递至轨道,同时在列车编组上施加相应的速度,该方式可有效模拟荷载的时空变化。(3)分析了联络横通道隧道交叉结构,以及近距离空间垂直交叉隧道在不同阶段(新建隧道与运营隧道)的振动效应,及其在隧道进口段、洞内段、出口段的响应特征。对比了应力、加速度、压致损伤、拉致损伤等力学参数的差异。(4)针对运营劣化隧道,在获得隧道劣化后主要力学指标的基础上,开展了列车不同行驶速度对应振动荷载的动力响应分析,研究了联络横通道交叉结构关键截面的损伤等动力响应特性。
[Abstract]:With the rapid development of high-speed railway and shield construction in China, there are a large number of high-speed railway tunnels constructed by shield method in mountainous areas and cities. Shield tunneling has the advantages of safety, high efficiency, high automation, low disturbance to the surrounding area, etc. However, there are usually many cross structure forms in shield tunnel, such as connecting cross passage structure, going to shaft, pumping room, etc. The main structure of shield tunnel is also included. Therefore, combined with Lion Yang Tunnel of Guangzhou-Shenzhen passenger dedicated Line, the plastic damage theory and stress of tunnel cross structure, vertical cross shield tunnel in close space, under the condition of train vibration load, are carried out in this paper. Acceleration time history analysis. The main research work and results are as follows: (1) the related calculation theory of train vibration effect is expounded, including: dynamics calculation principle, concrete damage theory, concrete strength reduction theory. The material damping problem, the dynamic boundary condition of the model and the constitutive relation of plastic damage of concrete are discussed. (2) in order to simulate the time and space effect of train formation in the entrance section, the inner section and the exit section of the tunnel, In this paper, a unique load curve is used to apply the measured train vibration curve to the train axle in the form of vertical excited vibration load, and at the same time, the train deadweight is applied on the train model, and the two forces are transferred from the axle to the track. At the same time, the corresponding speed is applied to train formation, which can effectively simulate the space-time variation of load. (3) the cross structure of the tunnel is analyzed. The vibration effect of the vertical cross tunnel in close space at different stages (new tunnel and operating tunnel) and its response characteristics in the entrance section, the inner section and the outlet section of the tunnel are also discussed. The differences of mechanical parameters such as stress, acceleration, compression damage and tensile damage are compared. (4) based on the main mechanical indexes after tunnel deterioration, The dynamic response of the train with different speeds corresponding to the vibration load is analyzed. The dynamic response characteristics of the key sections of the cross section of the connecting cross passage are studied.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.3

【参考文献】