地震动作用下浅埋隧道结构响应数值分析与试验研究

发布时间：2018-05-22 20:55

本文选题：浅埋隧道 + 地震响应　；参考：《重庆交通大学》2014年硕士论文

【摘要】：地震灾害的影响随着我国地下工程规模的扩大也越来越严重。地下结构比地上结构的抗震性能佳，但是在某些薄弱部位，抗震性能却往往得不到保证，这一点在浅埋隧道中尤为明显。最近2008年的四川汶川地震和2013年的雅安芦山地震，人们意识到山岭隧道等地下结构也会受到震害。而浅埋隧道对地震的动作用最为敏感，随着浅埋隧道越来越多，如果因为地震而引起浅埋隧道大范围的破坏，人员和经济损失将难以估计。因此,需要对地震动作用下浅埋隧道结构响应数值分析与试验研究，找出地下结构抗震设计的关键要点，为浅埋隧道结构等地下工程结构的优化设计提供科学的依据。故对影响浅埋隧道地震反应的若干因素进行数值分析具有重要意义。本文通过振动台试验研究了地震荷载下浅埋隧道围岩及结构加速度变化情况，为数值模拟的结果的验证提供可靠参考。采用了有限元软件Ansys对地震动作用下隧道结构动力响应建立了有限元模型，以围岩-结构相互作用为核心理论，通过时程分析法进行大量计算，得到一些规律，希望能为浅埋隧道的优化设计和地下结构的对地震响应提供参考，本文主要研究内容有以下几个方面： ①分析了当前地下结构发展趋势，，总结了地下结构抗震研究的历史、主要方法和当前研究的现状，提出了地震动作用下对浅埋隧道结构响应影响的若干因素研究的必要性和价值。 ②通过对振动台介绍和振动台试验的制作，从相似模型研究了地震荷载下隧道围岩及结构加速度变化情况，为下一步数值模拟的结果的验证提供可靠的参考。 ③通过对建立的计算模型采用时程分析方法，对在地震动作用下浅埋隧道的不同参数变化产生的结构响应进行分析，并找出规律和关键因素。通过建立不同的埋深、地震烈度、地质条件、衬砌厚度、衬砌强度等数值模型，对于影响浅埋隧道地震响应的多个参数进行了分析，提出了相应的影响模式。通过分析三维平面条件下浅埋隧道地震反应的解析结果，提出了对浅埋隧道地震反应特点的认识。在上述理论方法和研究结果基础上，进一步对不同的衬砌材料(不同的混凝土标号、不同的衬砌厚度和不同的衬砌强度)和不同的地质条件下对浅埋隧道结构的地震响应进行了探讨。 ④对影响因素计算结果进行分析并总结浅埋隧道抗减震措施的原理和方法。
[Abstract]:The impact of earthquake disasters is becoming more and more serious with the expansion of the scale of underground engineering in China. The seismic performance of the underground structure is better than that on the ground structure, but in some weak parts, the seismic performance is often not guaranteed. This is particularly evident in the shallow buried tunnel. In recent 2008, the Wenchuan earthquake in Sichuan and the Lushan earthquake in Ya'an in 2013, people We realize that the underground structures, such as the mountain tunnel, are also affected by the earthquake, and the shallow tunnel is most sensitive to the earthquake action. With the increasing number of shallow buried tunnels, it is difficult to estimate the damage of shallow buried tunnels, and the loss of personnel and economy will be difficult to estimate. Therefore, the structure response value of shallow tunnel under ground motion is needed. The key points of the seismic design of the underground structure are found out by the analysis and experimental research. It provides a scientific basis for the optimization design of the underground engineering structure, such as the shallow buried tunnel structure. Therefore, it is of great significance to analyze some factors affecting the seismic response of shallow buried tunnels. The acceleration changes of surrounding rock and structure provide a reliable reference for the verification of the results of numerical simulation. Finite element software Ansys is used to establish a finite element model for dynamic response of tunnel structures under ground motion. The core theory of surrounding rock structure interaction is taken as the core theory, and a large number of calculations are carried out by the time history analysis method, and some laws are obtained. It can provide reference for the optimal design of shallow tunnels and the seismic response of underground structures. The main contents of this paper are as follows:
Firstly, the development trend of the underground structure is analyzed, the history of the seismic study of the underground structure, the main methods and the current research status are summarized, and the necessity and value of several factors affecting the structure response of shallow buried tunnel under the action of ground motion are put forward.
Secondly, through the introduction of the vibrating table and the making of the shaking table test, the acceleration changes of the surrounding rock and structure of the tunnel under the earthquake load are studied from the similar model, so as to provide a reliable reference for the verification of the results of the next step numerical simulation.
By using the time history analysis method of the established calculation model, the structural response of different parameters of shallow buried tunnel under ground motion is analyzed, and the rules and key factors are found out. Through the establishment of different depth of buried depth, seismic intensity, geological conditions, lining thickness, lining strength and other numerical models, the influence of shallow tunnel on Shallow Tunnel Several parameters of seismic response are analyzed and the corresponding influence modes are put forward. By analyzing the analytical results of seismic response of shallow buried tunnels under three-dimensional plane conditions, the understanding of seismic response characteristics of shallow buried tunnels is proposed. On the basis of the theoretical method and research results mentioned above, different concrete lining materials (different concrete) are advanced. The seismic response of shallow tunnel structure is discussed under different labelling, different lining thickness and different lining strength and different geological conditions.
(4) analyzing the calculation results of influencing factors and summarizing the principles and methods of anti shock measures for shallow tunnels.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452.28

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