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浅埋暗挖法地铁隧道开挖对既有结构变形的影响分析

发布时间:2018-07-21 17:05
【摘要】:随着社会的发展,城市化规模不断扩大,地铁在应对地上交通拥挤上起到了重要作用。在城市地铁隧道的建设中,难免会遇到土质相对软弱并夹杂人工杂填土的第四纪地层,会遇到周边高楼林立、城市车水马龙、地下市政线路冗杂、地下建筑结构浅埋等复杂的交通环境,而浅埋暗挖法由于不干扰地面交通正常运行、工程施工成本较少、无需太多专项工程设备、无需考虑拆迁的难题、工程方法灵活等诸多特点,解决了上述难题,因此成为了一种在地下工程中大量应用的工法。地铁隧道开挖不仅要满足自身安全,同时也要保证周边既有结构不受破坏,然而在实际的施工过程中,注浆加固是在施工过程中简单有效的方式。本文基于查阅国内外大量文献,依托北京地铁7号线九龙山站~大郊亭站区间下穿既有结构大郊亭西人行天桥以及多条市政管线,分析隧道开挖对既有桥桩以及管线变形的影响。同时通过MIDAS-GTS数值模拟计算与监控量测数据进行对比,验证数值模拟计算的可靠性。本文主要研究内容如下:(1)通过查找并整理大量浅埋暗挖法地铁隧洞施工对既有结构影响课题的国内外文献,归纳总结前人在本课题理论的研究现状与理论。(2)依托北京地铁北京地铁7号线九龙山站~大郊亭站区间下穿既有结构大郊亭西人行天桥以及多条市政管线,通过有限元软件按照实际施工工序建立三维计算模型进行分析,分析出浅埋暗挖法隧道开挖和注浆加固对既有桥桩及管线的竖向位移和水平位移影响。(3)通过搜集现场实际监测数据,并与数值模拟数据进行对比分析,证明计算模型的准确可靠。(4)通过对比注浆加固与未注浆加固,浅埋暗挖法隧道开挖对既有结构的不同影响,证明注浆加固的有效性。
[Abstract]:With the development of society and the expansion of urbanization, subway plays an important role in dealing with overground traffic congestion. In the construction of urban subway tunnels, it is inevitable to encounter the Quaternary strata with relatively weak soil quality and mixed with artificial miscellaneous fill, the surrounding high-rise buildings, the traffic jumbled in the city, and the miscellaneous underground municipal lines. In the complicated traffic environment, such as shallow buried underground building structure, but the shallow buried excavation method does not interfere with the normal operation of ground traffic, the construction cost of the project is less, there is no need for too many special engineering equipment, and no need to consider the difficult problem of demolition and relocation. The flexibility of engineering methods has solved the above problems, so it has become a widely used engineering method in underground engineering. The excavation of subway tunnel should not only satisfy its own safety, but also ensure that the existing structures around it are not destroyed. However, grouting reinforcement is a simple and effective way in the actual construction process. Based on consulting a large number of documents at home and abroad, this paper relies on Jiulong Mountain Station ~ Great suburb Pavilion Station of Beijing Metro Line 7 to pass through the existing structure Great suburb Pavilion West pedestrian Flyover and several municipal pipelines. The influence of tunnel excavation on the deformation of existing bridge piles and pipelines is analyzed. At the same time, the reliability of the numerical simulation is verified by comparing the MIDAS-GTS numerical simulation with the monitoring data. The main contents of this paper are as follows: (1) by looking up and sorting out a large number of domestic and foreign literatures on the influence of shallow tunneling on existing structures, The current situation and theory of previous research on the theory of this subject are summarized and summarized. (2) depending on the Jiulong Mountain Station of Beijing Metro Line 7 ~ the Great suburb Pavilion Station, the existing structure of the Great suburb Pavilion West pedestrian Flyover and a number of municipal pipelines are passed under the existing structure. According to the actual construction procedure, the three-dimensional calculation model is established by the finite element software. The vertical displacement and horizontal displacement of existing bridge piles and pipelines are analyzed by excavation and grouting of shallow excavation method. (3) through collecting field monitoring data, and comparing with numerical simulation data, the paper analyzes the effect of tunnel excavation and grouting reinforcement on the vertical displacement and horizontal displacement of existing bridge piles and pipelines. It is proved that the calculation model is accurate and reliable. (4) the effectiveness of grouting reinforcement is proved by comparing grouting reinforcement with non-grouting reinforcement and the different effects of shallow tunneling on existing structures.
【学位授予单位】:中国地质大学(北京)
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:U456.3;U231.3

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