暗挖隧道导致土体及地下结构物变形研究

发布时间：2018-05-27 04:37

本文选题：暗挖隧道 + 影响因素　；参考：《天津大学》2014年硕士论文

【摘要】：地铁作为城市公共交通线路的重要组成部分，近年来在我国处于高速发展阶段，但由于地铁隧道多于城市中进行修建，地上及地下构筑物分布较为密集，，穿越施工涉及区域情况较为复杂，影响因素的多样性导致建设过程对周边土体的影响效果会随隧道的具体设计建造情况存在明显差别，确定实际方案时需对多种设计指标进行综合评估，以达到建设过程对周边结构物和正常社会秩序影响最小的目的。对单一影响因素作用下的土体响应变化规律进行更全面的认识是综合评估各项影响因素作用的前提。因此，地铁建设中普遍存在的主要影响因素及其对土体作用效果影响的变化规律需进一步进行研究整理。本文应用有限元模拟方法，针对影响暗挖隧道建设过程对周边土体作用效果的重要因素，系统研究了土体受影响导致变形的变化规律，以对实际工程的设计与评估工作提供参考建议。主要研究内容和结论如下： 1.归纳相关研究进展，总结了地铁工程施工常用技术，整理了国内外关于地下工程建设对土体影响的研究手段，以有限元模拟方法对暗挖隧道建设对周边土体产生的影响进行了建模分析研究。 2.研究了暗挖隧道施工中开挖沿线土体对隧道半径、埋深等影响因素的响应情况，利用数据结果揭示了暗挖隧道开挖支护过程中土体典型位置的位移发展历程，结果表明：隧道支护结构刚度不变情况下，当开挖步距与隧道埋深均相同时，隧道轴线上方地表土体沉降量随隧道半径增大而不断增大；当开挖步距与隧道半径均相同时，隧道轴线上方地表土体沉降量随埋深增大不断增大。且分析了这种土体变形变化规律的形成原因。 3.通过数值模拟方法证明平行隧道暗挖施工所造成的土体变形与简单单孔隧道暗挖变形在影响因素方面存在很大差别，分析了平行隧道建设中不同隧道间距及埋深下土体代表性位置的最终位移情况，为实际工程问题的解决提供参考。 4.针对南京地铁四号线工程实例，利用分析所得规律性结论确定开挖施工步骤及针对性的土体加固手段，通过有限元分析软件对实际工程进行建模分析，证实了所选工程手段的合理性与有效性，为施工建设提供了有价值的指导。
[Abstract]:As an important part of urban public transportation line, subway is in the high speed development stage in our country in recent years, but because subway tunnel is built more than city, the above ground and underground structures are distributed more intensively. The crossing construction involves complex regional conditions, and the diversity of influencing factors leads to obvious differences in the effect of the construction process on the surrounding soil mass with the specific design and construction of the tunnel. In order to achieve the goal of minimizing the influence of the construction process on the peripheral structures and normal social order, a variety of design indexes should be comprehensively evaluated in order to determine the actual scheme. A more comprehensive understanding of the law of soil response under the action of a single influencing factor is a prerequisite for comprehensive evaluation of the effect of each influencing factor. Therefore, it is necessary to further study the main influencing factors and their effects on soil mass in subway construction. In this paper, the finite element simulation method is used to study the variation law of the deformation caused by the influence of the soil mass, aiming at the important factors that affect the effect of the underground tunnel construction on the surrounding soil. To provide reference for the design and evaluation of the actual project. The main contents and conclusions are as follows: 1. Summarizing the related research progress, summing up the common technology of subway engineering construction, sorting out the domestic and foreign research methods about the influence of underground engineering construction on soil mass, The influence of tunneling construction on surrounding soil is analyzed by finite element method. 2. In this paper, the response of soil mass along the tunnel excavation to the influence factors such as tunnel radius and buried depth is studied, and the displacement development history of typical soil position in the excavation and support process of underground excavation tunnel is revealed by using the data results. The results show that when the stiffness of the tunnel support structure is invariable, when the excavation distance is equal to the depth of the tunnel, the settlement of the surface soil over the tunnel axis increases with the increase of the tunnel radius, and when the excavation step is equal to the tunnel radius, The settlement of the surface soil over the tunnel axis increases with the increase of the buried depth. The formation reason of this kind of soil deformation change law is also analyzed. 3. It is proved by numerical simulation that the deformation of soil caused by the excavation of parallel tunnel is very different from that of simple single hole tunnel in influencing factors. The final displacement of representative soil mass under different tunnel spacing and buried depth in parallel tunnel construction is analyzed in order to provide a reference for solving practical engineering problems. 4. In view of the example of Nanjing Metro Line 4 project, the excavation construction steps and soil reinforcement measures are determined by using the regular conclusion obtained from the analysis, and the actual project is modeled and analyzed by the finite element analysis software. The rationality and validity of the selected engineering means are confirmed and valuable guidance is provided for construction.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231.1;U452

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