寒区隧道衬砌抗冻混凝土试验与防冻技术研究

发布时间：2018-04-11 07:29

本文选题：寒区隧道 + 冻害　；参考：《西南交通大学》2017年硕士论文

【摘要】：我国隧道建设目前正处于高速发展的时期,其前景与重要性不言而喻。我国国土具有很强的跨地域性。目前有大量已修建的、在建的和将要修建的各种形式的隧道。隧道建设在我国乃至世界上都是一个充满朝气,充满机遇和未来的行业。但是,复杂的建设环境让隧道建设行业充满了挑战,比如寒区隧道冻害问题,是行内建设者们必须逾越的难关。通过对寒区隧道的文献调查发现:寒区隧道受冻害程度高、经济浪费大以及存在交通安全隐患。日本,是一个多隧道的亚洲国家。有学者统计,在将近4000座寒区铁路隧道中,大量隧道在运营中受到冻害的影响。虽然国家投入了大量的资金但无法根治问题。我国是一个多冻土国家,工程建设和科研工作者都面临新时代严峻的挑战。由于起初没有认识到冻害的存在,气候、材料、以及隧道施工工艺等的问题导致了隧道冻害的发生,并为此付出的巨大的经济损失。日本曾经对国内铁路隧道线进行调查发现:凡是漏水的寒区隧道,全部形成冻害。寒区隧道工程与一般地区相比,要解决多项复杂的技术性问题,其中最主要的问题是寒区隧道季节性冻融、冻胀作用影响,这种周期性的加卸载作用将对隧道主体结构造成破坏,其最终造成的结果是影响施工人员和运营期间安全性及结构寿命,造成巨大的经济损失和资源浪费。混凝土是隧道建设乃至整个建设行业最为普遍而又重中之重的材料。在建设领域中混凝土的使用己有一个半世纪。研究高性能混凝土,提高混凝土的抗冻性能和改善隧道的温度条件以及水环境条件进行防冻,是如今国内外寒区隧道抗防冻的主要措施。如何在寒冷地区隧道修建中采取有效措施,避免隧道冻害现象的发生,是目前隧道工程界亟待解决的问题。本文针对寒区修建隧道所面临的一系列特殊问题,查阅了大量的参考文献,在现有技术基础上,采用"理论分析、室内试验、数值模拟"的研究方法,着力解决寒区隧道衬砌结构高性能抗冻混凝土研发和寒区隧道冬季综合抗防冻施工技术等攻关难题,并作如下工作:(1)论文通过水化热测试试验,得到水泥水化热的变化规律,在此基础上进行抗冻混凝土的研发,通过相关试验得到抗冻性能良好的混凝土配合比;(2)采用弹性力学方法进行隧道冻胀力的理论求解,采用热固耦合数值模拟方法分析隧道温度场的变化,研究隧道冻胀力。发现理论分析得到的隧道冻胀力比实际工程中测到的冻胀力大,因为实际工程中得到的冻胀力是已经释放能量之后的结果。(3)查阅文献,进行国内外调研,结合实际工程,对冬季施工中的控制和管理措施进行探索,总结冬季隧道施工中的抗防冻研究经验。
[Abstract]:Tunnel construction in China is in a period of rapid development, its prospects and importance are self-evident.The territory of our country has strong cross-regional character.There are a large number of tunnels in various forms that have been built, are under construction and will be built.Tunnel construction in China and even the world is a vibrant, full of opportunities and the future of the industry.However, the complex construction environment makes the tunnel construction industry full of challenges, such as cold tunnel freezing damage, which must be overcome by the builders in the industry.Through the investigation of the tunnel in the cold region, it is found that the tunnel in the cold region has a high degree of frostbite, a large economic waste and a hidden danger of traffic safety.Japan is an Asian country with many tunnels.According to the statistics of some scholars, in nearly 4000 railway tunnels in cold region, a large number of tunnels are affected by freezing injury in operation.Although the state has invested a lot of money, it cannot cure the problem.China is a permafrost country, engineering construction and scientific research workers are facing severe challenges in the new era.Due to the lack of recognition of the existence of freezing injury, climate, materials, and tunnel construction technology, and so on, the freezing injury of tunnel occurred, and the huge economic loss was paid.Japan once investigated the domestic railway tunnel lines and found that all the cold tunnels with leaking water caused freezing damage.Compared with other regions, tunnel engineering in cold region has to solve many complicated technical problems, the most important of which is the seasonal freeze-thaw and frost heave effect of tunnel in cold region.This periodic loading and unloading action will destroy the main structure of the tunnel. The final result is that the safety and life of the structure during construction and operation period will be affected and huge economic loss and waste of resources will be caused.Concrete is the most common and most important material in tunnel construction and even the whole construction industry.Concrete has been used in the field of construction for a century and a half.To study high performance concrete, to improve the frost resistance of concrete and to improve the temperature condition and water environment condition of tunnel is the main measure to protect tunnel from freezing in cold region at home and abroad.How to take effective measures in the construction of tunnels in cold regions and avoid the phenomenon of tunnel freezing damage is a problem to be solved urgently in the tunnel engineering field at present.In view of a series of special problems faced by tunnel construction in cold region, this paper has consulted a large number of references and adopted the research method of "theoretical analysis, indoor test, numerical simulation" on the basis of existing technology.The research and development of high performance antifreeze concrete for tunnel lining structure in cold area and the comprehensive anti-freezing construction technology for tunnel in cold area in winter are solved, and the following work is done: (1) through hydration heat test, the change rule of cement hydration heat is obtained.On this basis, the research and development of antifreeze concrete is carried out. Through the relevant tests, the concrete mixture ratio with good frost resistance is obtained. The elastic mechanics method is used to solve the frost heave force of the tunnel.The temperature field of the tunnel is analyzed by using the thermal-solid coupling numerical simulation method, and the frost heave force of the tunnel is studied.It is found that the frost heave force obtained by theoretical analysis is greater than that measured in the actual project, because the frost heave force obtained in the actual project is the result of the release of energy.This paper probes into the control and management measures in winter construction and summarizes the research experience of anti-freezing in winter tunnel construction.
【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】：U455.91

【参考文献】