本文選題：凍土隧道　切入點(diǎn)：凍脹力　出處：《重慶交通大學(xué)》2014年碩士論文

【摘要】：隨著我國經(jīng)濟(jì)建設(shè)的發(fā)展，西部大開發(fā)政策的實(shí)施，交通基礎(chǔ)設(shè)施建設(shè)的需求在不斷增長，尤其是我國藏區(qū)高原鐵路、公路建設(shè)的興起，高海拔寒冷地區(qū)凍土隧道的建設(shè)技術(shù)問題日益受到工程界的關(guān)注和重視。公路隧道—工程建設(shè)中的重要結(jié)構(gòu)物，迎來了空前規(guī)模的建設(shè)熱潮。隧道圍巖中的裂隙水和孔隙水凍結(jié)時(shí)，圍巖發(fā)生體積膨脹，當(dāng)體積膨脹受到凍土隧道襯砌和未凍圍巖體的約束，凍結(jié)圍巖對凍土隧道襯砌產(chǎn)生作用力，凍土隧道襯砌對凍結(jié)圍巖產(chǎn)生抗力，約束其體積膨脹，這就形成圍巖凍脹力。 隧道襯砌受凍脹力與其他的作用力共同作用，可能造成隧底冒水、積冰、凍脹，使隧道襯砌開裂、酥碎、剝落，導(dǎo)致隧道出現(xiàn)漏水、結(jié)冰、掛冰等一系列凍害，威脅隧道的正常運(yùn)營。凍土區(qū)隧道工程作為一個(gè)重要研究課題列入研究計(jì)劃中，因?yàn)閮鐾羺^(qū)隧道工程有其特殊性，一方面反映非凍土區(qū)所沒有的特點(diǎn)與問題，另一方面與非凍土區(qū)在一些問題雖具有共性，，但在凍土區(qū)中反映更為清晰和透徹，因此凍土區(qū)隧道工程問題早己引起凍土區(qū)國家工程界的普遍重視，引起國家工程界科研人士的研究熱潮。凍土區(qū)隧道工程面臨的主要挑戰(zhàn)有：①隧道襯砌層將遭受凍脹力的作用。②凍土區(qū)隧道圍巖與襯砌要遭受反復(fù)的凍融作用，形成各種凍害。凍土隧道凍害的問題以前就己經(jīng)大量發(fā)生，也是長期以來隧道工程界研究的重點(diǎn)課題。對于隧道凍脹力進(jìn)入深入研究，其中襯砌凍脹力是最為重要的研究內(nèi)容，確定凍脹力的影響因素，凍脹力的計(jì)算方法，進(jìn)行凍脹力的敏感度分析，研究圍巖的凍脹機(jī)理，對由凍脹力產(chǎn)生的凍害采取措施防止，探求隧道建設(shè)中的一些保溫防凍措施和工程實(shí)際措施。 本論文的主要研究工作如下： ①調(diào)查凍土隧道的凍害現(xiàn)象及研究凍土凍脹的力學(xué)機(jī)理 ②通過實(shí)測實(shí)際工程隧道建設(shè)中的圍巖溫度，然后進(jìn)行整理和分析，得出隧道圍巖凍融圈的范圍。 ③以凍融巖石圈整體凍脹說為理論基礎(chǔ)和實(shí)測凍融圈的范圍為參考，通過彈性力學(xué)和彈塑性有限元數(shù)值模擬的方法，研究凍脹力及凍脹應(yīng)力的影響因素，研究凍脹應(yīng)力在隧道襯砌的分布規(guī)律； ④研究和總結(jié)防凍保溫技術(shù)在實(shí)際工程中的應(yīng)用。
[Abstract]:With the development of China's economic construction and the implementation of the policy of developing the western region, the demand for the construction of transportation infrastructure is constantly increasing, especially the rise of plateau railway and highway construction in the Tibetan region of China. More and more attention has been paid to the construction technology of frozen earth tunnel in the cold area at high altitude. When the fissure water and pore water in the surrounding rock of the tunnel are frozen, the volume expansion of the surrounding rock occurs, and when the volume expansion is restricted by the tunnel lining and the unfrozen surrounding rock body, the volume expansion of the surrounding rock is restricted by the frozen soil tunnel lining and the unfrozen surrounding rock body. The frozen wall rock exerts force on the tunnel lining of frozen soil, and the tunnel lining of frozen soil produces resistance to the frozen surrounding rock and restricts its volume expansion, which forms the frost heave force of surrounding rock. The combined action of frost heaving force on tunnel lining and other forces may result in water rising, ice accumulation, frost heaving at the bottom of the tunnel, cracking, crumbling and spalling of the tunnel lining, resulting in a series of freezing damage such as leakage, icing and ice hanging in the tunnel. As an important research topic, tunnel engineering in frozen earth region is included in the research plan, because tunnel engineering in frozen earth region has its particularity, on the one hand, it reflects the characteristics and problems that do not exist in non-frozen soil region. On the other hand, although there are some common problems with non-frozen soil regions, they are reflected more clearly and thoroughly in frozen soil regions. Therefore, the tunnel engineering problems in frozen soil regions have long attracted the general attention of the national engineering circles in frozen earth regions. The main challenge of tunnel engineering in frozen soil region is that the lining of tunnel will be subjected to frost heave force. 2. the wall rock and lining of tunnel in frozen soil region will be subjected to repeated freezing and thawing. The problem of freezing injury in frozen soil tunnel has occurred in large quantities before, and it has been a key topic in tunnel engineering for a long time. The frost heave force of tunnel has entered deep research, among which the frost heave force of lining is the most important research content. The influence factors of frost heave force, the calculation method of frost heave force, the sensitivity analysis of frost heave force, the frost heave mechanism of surrounding rock are studied, and the measures to prevent the frost damage caused by frost heaving force are taken. To explore some heat preservation and anti-freezing measures and practical engineering measures in tunnel construction. The main research work of this thesis is as follows:. 1. Investigation of freezing damage phenomenon in frozen soil tunnel and study on mechanics mechanism of frost heave in frozen soil. (2) by measuring the surrounding rock temperature in the tunnel construction, and then arranging and analyzing, the range of the freeze-thaw circle of the tunnel surrounding rock is obtained. (3) based on the theory of frozen-thawing lithosphere and the range of frozen-thawing circle, the influence factors of frost heave force and frost heave stress are studied by means of elastic mechanics and elastic-plastic finite element numerical simulation method. The distribution of frost heave stress in tunnel lining is studied. 4 study and summarize the application of anti-freezing and heat preservation technology in practical engineering.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451.2

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