顶管上穿施工对既有地铁隧道的影响分析

发布时间：2018-01-16 00:02

本文关键词：顶管上穿施工对既有地铁隧道的影响分析　出处：《湘潭大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国城市轨道交通网工程的不断进行，地铁建设在城市轨道交通建设中所占的比例越来越重。而顶管技术作为一种在我国市政管道建设中得到广泛应用的非开挖施工方法，在进行施工时会对顶管四周的土体产生扰动，，引起土体产生位移和变形。因此，当顶管施工面临跨越既有地铁隧道的情况时，将会对地铁隧道产生影响，危及地铁隧道的安全。本文以杭州市某污水管道上穿既有地铁隧道为背景，研究顶管在上穿施工过程中对其下方既有地铁隧道所产生的变形的分布形态和影响规律。主要研究内容和成果如下：（1）从顶管的施工特点入手，系统地探讨了顶管施工引起土体和地下管线的变形特性，分析表明：既有地铁隧道在顶管开挖作用下的变形主要受土体损失的影响。（2）结合杭州市某污水总管上穿地铁一号线车站区间项目工程，针对顶管施工给地铁隧道所造成的影响进行了现场监控量测，分析了地铁隧道在顶管开挖工程中的竖向位移、水平位移规律以及地表沉降规律。研究发现：顶管开挖对既有地铁隧道的扰动范围为既有地铁隧道前后10m左右；既有地铁隧道在顶管开挖的影响下，其变形最大的部分处于顶管轴线下方，其变形曲线近似槽状分布；并且地铁隧道之间的空间位置对地铁隧道的变形有一定的影响。（3）根据工程背景，利用有限差分软件FLAC3D，对顶管上穿既有地铁隧道这一施工过程进行模拟，通过模拟结果与工程现场监测结果进行对比分析，验证了模型的可靠性。并在此基础上探讨了在顶管推进过程中，顶管与地铁盾构隧道的垂直距离、顶管管径、顶管管材以及地铁所处土层的属性等不同工况对地铁盾构隧道的影响。研究表明：数值模拟结果与实测曲线吻合较好，FLAC3D能很好的对顶管上穿既有地铁隧道这一施工过程进行模拟；地铁隧道的变形受不同顶管施工工况的影响较大，在实际工程中，选择合适的施工参数有利于控制地铁隧道的变形。（4）根据研究成果以及工程实际情况，总结归纳了施工控制措施，包括施工风险控制及建议、对扰动区土体加固以及监测控制。从监测的结果来看，这些措施有效的控制了地铁隧道的变形。
[Abstract]:With the development of urban rail transit network in China. Subway construction is more and more important in the construction of urban rail transit. Pipe jacking technology is widely used as a non-excavation construction method in the construction of municipal pipelines in China. During the construction, the soil around the pipe jacking will be disturbed, resulting in the displacement and deformation of the soil. Therefore, when the pipe jacking construction is faced with the situation of crossing the existing subway tunnel, it will have an impact on the subway tunnel. The safety of subway tunnel is endangered. The background of this paper is to pass through the existing subway tunnel on a sewage pipe in Hangzhou. This paper studies the distribution pattern and influence law of the deformation caused by the existing subway tunnel under the pipe jacking in the process of jacking construction. The main research contents and results are as follows: 1) based on the characteristics of pipe jacking construction, the deformation characteristics of soil and underground pipeline caused by pipe jacking construction are systematically discussed. The analysis shows that the deformation of existing subway tunnel under the action of pipe jacking is mainly affected by soil loss. Combined with the project of station section of No. 1 subway line on a sewage pipe in Hangzhou, the site monitoring and measurement of the influence caused by pipe jacking construction on subway tunnel is carried out. The vertical displacement of subway tunnel in pipe jacking excavation is analyzed. It is found that the disturbance range of pipe jacking excavation to the existing subway tunnel is about 10 m before and after the existing subway tunnel; Under the influence of pipe-jacking excavation, the largest deformation of the existing subway tunnel lies below the pipe-jacking axis, and the deformation curve is similar to the groove distribution. And the space position between the subway tunnel has certain influence on the deformation of the subway tunnel. According to the engineering background, the construction process of pipe-jacking through the existing subway tunnel is simulated by using finite-difference software FLAC3D. The reliability of the model is verified. On this basis, the vertical distance and pipe jacking diameter between the pipe jacking and the shield tunnel in the process of pipe jacking are discussed. The effects of pipe jacking material and soil properties of subway on the shield tunneling are studied. The results show that the numerical simulation results are in good agreement with the measured curves. FLAC3D can well simulate the construction process of pipe-jacking through the existing subway tunnel; The deformation of subway tunnel is greatly affected by different pipe-jacking conditions. In practical engineering, choosing appropriate construction parameters is helpful to control the deformation of subway tunnel. 4) according to the research results and the actual situation of the project, summarized the construction control measures, including construction risk control and suggestions, soil reinforcement and monitoring control in disturbed areas. From the monitoring results. These measures effectively control the deformation of subway tunnel.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231.1;TU990.3

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