沉管隧道工程关键技术研究与分析

发布时间：2018-05-25 03:02

本文选题：沉管隧道 + 施工技术　；参考：《西南交通大学》2017年硕士论文

【摘要】：随着我国经济和城市及城际交通的快速发展,对穿越江河流域、海湾区域的交通和运输系统的设计、施工提出了新的要求。目前,世界各国一大批跨河口、跨海湾的重大通道工程纷纷酝酿采用沉管隧道的方式,欧美及日本已经有不少成功应用沉管隧道的实例,我国上海、广州和宁波等地区也修建了沉管隧道。虽然沉管隧道在我国发展迅速,但是国内沉管隧道起步较晚,许多技术与国外相比尚未成熟,而建设沉管隧道工程是庞大、复杂、艰巨的任务,涉及到多学科领域,许多关键技术尚未完善,因此必须在沉管隧道工程建设过程中,不断总结、积累建设经验。国内某沉管隧道修建在内河中上游的沉管隧道,也是公路与地铁合建沉管隧道。因特殊的地理环境和施工条件,该隧道建设过程中所采用的技术与国内已修建的沉管隧道较为不同。本文在查阅大量国内外沉管隧道文献和工程研究成果的基础上,以该沉管隧道为研究对象,对其沉管隧道工程施工过程中关键技术进行分析研究。本文主要工作内容和结论如下:1)研究国内外沉管隧道的发展状况,根据发展状况总结沉管隧道的优缺点;2)根据国内外已建或在建的沉管隧道工程,对沉管隧道工程的关键工序进行研究,总结关键施工序所采用的施工工艺,提出各施工工艺的优缺点,为以后修建沉管隧道工程提出参考;3)分析研究国内某沉管隧道工程的干坞、管段预制、基槽开挖、管段浮运沉放、管段基础处理等工序的关键施工技术,研究施工过程中的重难点,并提出应对措施;4)针对管段起浮阶段的浮态和稳态进行研究分析,结果表明管段的压载水位布置对管段的重心偏移有一定影响但影响较小,压载水位应尽量对称布置、对称抽水,管段起浮后应尽量选择较大的干舷值,保证管段的定倾高度较高,同时在设计和施工中采取保护措施保证管段的初稳性最好;5)对管段在荷载作用下的管段应力、位移进行计算分析,结果表明在中隔墙与顶板交接处产生较大的拉应力,应在受拉区配置适当强度的钢筋,满足抗拉和抗弯要求。侧墙与管顶板交接区域产生较大的压应力,应在受压区域增大配筋量。本工程管段属于非对称结构,应力起到控制作用的是管段的对称部分市政廊道。但不对称部分会导致管段的两边的不均匀变形比较明显,因此应采取措施尽量消除该不利影响。本文所进行的研究分析可为以后沉管隧道工程提供参考,具有理论和实际意义。
[Abstract]:With the rapid development of economy, city and intercity traffic in China, new requirements are put forward for the design and construction of traffic and transportation system across river basins and gulf regions. At present, a large number of major tunnel projects across estuaries and bays in various countries in the world are planning to adopt the method of immersed tube tunnels. There have been many examples of successful application of immersed tunnels in Europe, America and Japan. Shanghai, China, Sinking tunnels have also been built in areas such as Guangzhou and Ningbo. Although the immersed tunnel is developing rapidly in our country, the domestic tunnel starts relatively late, many technologies are not mature compared with foreign countries, and the construction of immersed tunnel project is a huge, complex and arduous task, which involves many disciplines. Many key technologies have not been perfected, so it is necessary to sum up and accumulate construction experience in the construction of immersed tunnel. A sinking tunnel built in the upper reaches of inland river is also a tunnel built by highway and subway. Due to the special geographical environment and construction conditions, the technology used in the construction of the tunnel is different from that used in the domestic tunnel. On the basis of consulting a large number of documents and engineering research results of immersed tunnel at home and abroad, this paper analyzes and studies the key technology in the construction process of the immersed tunnel with this tunnel as the research object. The main contents and conclusions of this paper are as follows: (1) to study the development of immersed tunnels at home and abroad, and to summarize the advantages and disadvantages of immersed tunnels according to the development situation. This paper studies the key processes of the immersed tunnel engineering, summarizes the construction technology used in the key construction sequence, and puts forward the advantages and disadvantages of each construction technology. The key construction technology of dry dock, pipe section prefabrication, foundation groove excavation, pipe section floating and sinking, pipe section foundation treatment and so on are analyzed and studied for the future construction of immersed tube tunnel engineering, such as dry dock, pipe section prefabrication, foundation excavation, pipe section floating and sinking, pipe section foundation treatment and so on. This paper studies the heavy and difficult points in the construction process, and puts forward some measures to deal with the floating state and steady state in the floating stage of the pipe segment. The results show that the ballast water level arrangement of the pipe section has a certain influence on the barycenter shift of the pipe section, but the influence is relatively small. Ballast water level should be arranged symmetrically as far as possible, and symmetrical pumping should be carried out, and the larger freeboard value should be chosen after the pipe section floats, so as to ensure that the fixed tilting height of the pipe section is relatively high. At the same time, protective measures are taken in design and construction to ensure the best initial stability of the pipe section. (5) the stress and displacement of the pipe section under load are calculated and analyzed. The results show that there is a large tensile stress at the junction between the middle partition wall and the roof. Steel bars of appropriate strength shall be provided in the tensile area to meet the tensile and bending requirements. The large compressive stress is produced in the interface area between the side wall and the pipe roof, so the reinforcement should be increased in the compression area. The pipe section of the project belongs to asymmetric structure, and the stress is controlled by the symmetrical part of the municipal corridor of the pipe section. However, the asymmetric part will lead to the obvious uneven deformation on both sides of the pipe section, therefore, measures should be taken to eliminate the adverse effects as far as possible. The research and analysis in this paper can provide a reference for the future tunnel engineering, which is of theoretical and practical significance.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455

【参考文献】