發(fā)布時(shí)間：2018-06-05 04:03

  本文選題：隧道襯砌 + 鋼筋銹蝕　； 參考：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文

【摘要】：隧道工程在世界范圍內(nèi),特別是現(xiàn)今的中國(guó)得到了極大發(fā)展,但是越來越多的襯砌病害問題影響著隧道工程的正常使用。鋼筋銹蝕是引起鋼筋混凝土結(jié)構(gòu)病害的主要原因。如果襯砌鋼筋過早的發(fā)生銹蝕,其維護(hù)不僅耗費(fèi)大量的人力物力,還影響隧道的正常運(yùn)營(yíng),縮短使用壽命,嚴(yán)重時(shí)還會(huì)給隧道內(nèi)車輛的行駛帶來安全問題。開展不同銹蝕條件下混凝土劣化對(duì)襯砌結(jié)構(gòu)穩(wěn)定性影響的研究,對(duì)隧道的健康評(píng)價(jià)具有十分重要的意義。本文以此為主線,采用理論分析、物理試驗(yàn)和數(shù)值模擬多種手段研究襯砌鋼筋銹蝕問題。數(shù)值模擬過程中通過將鋼筋銹蝕問題轉(zhuǎn)化為相應(yīng)混凝土力學(xué)性能退化的問題,對(duì)鋼筋銹蝕引起混凝土劣化作用下的襯砌結(jié)構(gòu)應(yīng)力和變形規(guī)律進(jìn)行研究,分析各因素的影響程度并判斷結(jié)構(gòu)的穩(wěn)定性。取得地主要研究結(jié)果如下:(1)通過實(shí)驗(yàn)室物理試驗(yàn)得到了鋼筋在氯化氫溶液、氯化鈉溶液和純凈水中的平均年腐蝕深度值。(2)拱頂和直墻部位鋼筋銹蝕加大了結(jié)構(gòu)的變形,但對(duì)最大應(yīng)力無影響。拱肩和墻腳部位鋼筋銹蝕使得鋼筋銹蝕處應(yīng)力減小,而周圍應(yīng)力增大,襯砌內(nèi)側(cè)應(yīng)力變化明顯。結(jié)構(gòu)中最大拉應(yīng)力和位移值隨著銹蝕作用的增加而逐漸增大,安全系數(shù)值逐漸降低。(3)各位置在不同范圍銹蝕作用下,軸向增大對(duì)襯砌應(yīng)力的影響大于環(huán)向。不同位置出現(xiàn)銹蝕,混凝土劣化單元處圍巖的位移值基本不變,應(yīng)力值變化較小,襯砌輕度銹蝕對(duì)圍巖穩(wěn)定性影響不大。(4)墻腳是襯砌結(jié)構(gòu)鋼筋發(fā)生銹蝕后最容易出現(xiàn)問題的危險(xiǎn)位置,其次是拱肩,直墻。銹蝕程度是三因素中對(duì)襯砌結(jié)構(gòu)穩(wěn)定性最不利的因素。(5)在實(shí)際工程中,可根據(jù)隧道襯砌主要位置的銹蝕深度、銹蝕程度和銹蝕范圍得到鋼筋銹蝕率并計(jì)算劣化后的混凝土抗拉強(qiáng)度,對(duì)隧道結(jié)構(gòu)穩(wěn)定性作出評(píng)價(jià)。
[Abstract]:Tunnel engineering has been greatly developed in the world, especially in China, but more and more lining problems affect the normal use of tunnel engineering. The corrosion of steel bar is the main cause of the disease of reinforced concrete structure. If the lining steel bar rusts prematurely, its maintenance not only consumes a lot of manpower and material resources, but also affects the normal operation of the tunnel, shortens the service life, and brings safety problems to the driving of the vehicle in the tunnel seriously. It is very important to study the influence of concrete deterioration on the stability of lining structure under different corrosion conditions. In this paper, the corrosion problem of lining steel bar is studied by means of theoretical analysis, physical test and numerical simulation. In the process of numerical simulation, the stress and deformation law of lining structure caused by reinforcement corrosion is studied by transforming the problem of reinforcement corrosion into the degradation of corresponding concrete mechanical properties. Analyze the influence degree of each factor and judge the stability of structure. The main results obtained are as follows: (1) the average annual corrosion depth of steel bars in hydrogen chloride solution, sodium chloride solution and purified water is obtained by physical experiments in laboratory. But it has no effect on the maximum stress. The corrosion of steel bar at the arch shoulder and the foot of the wall makes the stress of the corroded steel bar decrease, while the stress around the wall increases, and the stress inside the lining changes obviously. The maximum tensile stress and displacement increase with the increase of corrosion, and the safety factor decreases gradually. Corrosion occurs in different locations, the displacement of surrounding rock at the deterioration unit of concrete is basically unchanged, and the stress value changes slightly. The slight corrosion of lining has little effect on the stability of surrounding rock. The foot of wall is the dangerous position where the corrosion of steel bar of lining structure occurs most easily, followed by arched shoulder and straight wall. Corrosion degree is the most disadvantageous factor of three factors to the stability of lining structure. In actual engineering, it can be based on the corrosion depth of the main position of tunnel lining. The corrosion degree and corrosion range of the steel bar are obtained and the tensile strength of the degraded concrete is calculated, and the stability of the tunnel structure is evaluated.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U451;U457

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 姬永生;袁迎曙;宋萌;申建立;徐從宇;;不同銹蝕條件下混凝土內(nèi)鋼筋銹蝕物膨脹性能比較和機(jī)理分析[J];北京工業(yè)大學(xué)學(xué)報(bào);2011年11期

2 洪乃豐;混凝土中鋼筋腐蝕與結(jié)構(gòu)物的耐久性[J];公路;2001年02期

3 張克波;張建仁;王磊;;銹蝕對(duì)鋼筋強(qiáng)度影響試驗(yàn)研究[J];公路交通科技;2010年12期

4 羅海順;;淺談圬工梁鋼筋銹蝕的預(yù)防與修復(fù)方法[J];甘肅科技;2007年12期

5 王青;徐港;衛(wèi)軍;劉德富;;混凝土中鋼筋銹蝕深度比值的概率分布模型研究[J];工業(yè)建筑;2011年05期

6 金偉良,趙羽習(xí),鄢飛;鋼筋混凝土構(gòu)件的均勻鋼筋銹脹力的機(jī)理研究[J];水利學(xué)報(bào);2001年07期

7 袁迎曙,賈福萍,蔡躍;銹蝕鋼筋混凝土梁的結(jié)構(gòu)性能退化模型[J];土木工程學(xué)報(bào);2001年03期

8 陳七林;;基于耐久性的隧道結(jié)構(gòu)設(shè)計(jì)的幾個(gè)問題[J];現(xiàn)代隧道技術(shù);2011年04期

相關(guān)會(huì)議論文 前1條

1 高明贊;徐天寧;蔣海平;干偉忠;;混凝土結(jié)構(gòu)鋼筋電解行為的模擬實(shí)驗(yàn)研究[A];第17屆全國(guó)結(jié)構(gòu)工程學(xué)術(shù)會(huì)議論文集（第Ⅱ冊(cè)）[C];2008年

相關(guān)碩士學(xué)位論文 前1條

1 盧珍;銹蝕鋼筋力學(xué)性能及其對(duì)混凝土構(gòu)件的影響[D];沈陽建筑大學(xué);2013年

，

本文編號(hào)：1980409