本文選題：寒區(qū)隧道 + 凍害　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：我國隧道建設(shè)目前正處于高速發(fā)展的時期,其前景與重要性不言而喻。我國國土具有很強(qiáng)的跨地域性。目前有大量已修建的、在建的和將要修建的各種形式的隧道。隧道建設(shè)在我國乃至世界上都是一個充滿朝氣,充滿機(jī)遇和未來的行業(yè)。但是,復(fù)雜的建設(shè)環(huán)境讓隧道建設(shè)行業(yè)充滿了挑戰(zhàn),比如寒區(qū)隧道凍害問題,是行內(nèi)建設(shè)者們必須逾越的難關(guān)。通過對寒區(qū)隧道的文獻(xiàn)調(diào)查發(fā)現(xiàn):寒區(qū)隧道受凍害程度高、經(jīng)濟(jì)浪費(fèi)大以及存在交通安全隱患。日本,是一個多隧道的亞洲國家。有學(xué)者統(tǒng)計(jì),在將近4000座寒區(qū)鐵路隧道中,大量隧道在運(yùn)營中受到凍害的影響。雖然國家投入了大量的資金但無法根治問題。我國是一個多凍土國家,工程建設(shè)和科研工作者都面臨新時代嚴(yán)峻的挑戰(zhàn)。由于起初沒有認(rèn)識到凍害的存在,氣候、材料、以及隧道施工工藝等的問題導(dǎo)致了隧道凍害的發(fā)生,并為此付出的巨大的經(jīng)濟(jì)損失。日本曾經(jīng)對國內(nèi)鐵路隧道線進(jìn)行調(diào)查發(fā)現(xiàn):凡是漏水的寒區(qū)隧道,全部形成凍害。寒區(qū)隧道工程與一般地區(qū)相比,要解決多項(xiàng)復(fù)雜的技術(shù)性問題,其中最主要的問題是寒區(qū)隧道季節(jié)性凍融、凍脹作用影響,這種周期性的加卸載作用將對隧道主體結(jié)構(gòu)造成破壞,其最終造成的結(jié)果是影響施工人員和運(yùn)營期間安全性及結(jié)構(gòu)壽命,造成巨大的經(jīng)濟(jì)損失和資源浪費(fèi)。混凝土是隧道建設(shè)乃至整個建設(shè)行業(yè)最為普遍而又重中之重的材料。在建設(shè)領(lǐng)域中混凝土的使用己有一個半世紀(jì)。研究高性能混凝土,提高混凝土的抗凍性能和改善隧道的溫度條件以及水環(huán)境條件進(jìn)行防凍,是如今國內(nèi)外寒區(qū)隧道抗防凍的主要措施。如何在寒冷地區(qū)隧道修建中采取有效措施,避免隧道凍害現(xiàn)象的發(fā)生,是目前隧道工程界亟待解決的問題。本文針對寒區(qū)修建隧道所面臨的一系列特殊問題,查閱了大量的參考文獻(xiàn),在現(xiàn)有技術(shù)基礎(chǔ)上,采用"理論分析、室內(nèi)試驗(yàn)、數(shù)值模擬"的研究方法,著力解決寒區(qū)隧道襯砌結(jié)構(gòu)高性能抗凍混凝土研發(fā)和寒區(qū)隧道冬季綜合抗防凍施工技術(shù)等攻關(guān)難題,并作如下工作:(1)論文通過水化熱測試試驗(yàn),得到水泥水化熱的變化規(guī)律,在此基礎(chǔ)上進(jìn)行抗凍混凝土的研發(fā),通過相關(guān)試驗(yàn)得到抗凍性能良好的混凝土配合比;(2)采用彈性力學(xué)方法進(jìn)行隧道凍脹力的理論求解,采用熱固耦合數(shù)值模擬方法分析隧道溫度場的變化,研究隧道凍脹力。發(fā)現(xiàn)理論分析得到的隧道凍脹力比實(shí)際工程中測到的凍脹力大,因?yàn)閷?shí)際工程中得到的凍脹力是已經(jīng)釋放能量之后的結(jié)果。(3)查閱文獻(xiàn),進(jìn)行國內(nèi)外調(diào)研,結(jié)合實(shí)際工程,對冬季施工中的控制和管理措施進(jìn)行探索,總結(jié)冬季隧道施工中的抗防凍研究經(jīng)驗(yàn)。
[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.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U455.91

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