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naocaner捐助貴賓 (初入文壇)
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[求助]
隧道工程中文摘要
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摘要：高應(yīng)力軟巖條件下的小間距隧道因施工過(guò)程的擾動(dòng)，隧道變形及結(jié)構(gòu)受力極其復(fù)雜，易出現(xiàn)支護(hù)結(jié)構(gòu)破壞現(xiàn)象。本文結(jié)合在建成蘭鐵路—楊家坪隧道小間距段，采用理論分析、現(xiàn)場(chǎng)測(cè)試和數(shù)值模擬手段，分析了高應(yīng)力軟巖小間距隧道的變形和結(jié)構(gòu)受力特點(diǎn)，對(duì)支護(hù)破壞原因進(jìn)行了總結(jié)。首先采用數(shù)值模擬方法對(duì)不同間距下后行隧道施工對(duì)先行隧道變形的影響進(jìn)行分析，并與實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比；其次設(shè)置監(jiān)測(cè)斷面對(duì)先行隧道初支結(jié)構(gòu)應(yīng)力受后行隧道影響進(jìn)行測(cè)試；最后結(jié)合變形特點(diǎn)，對(duì)二襯破壞原因進(jìn)行總結(jié)。結(jié)果表明：在高應(yīng)力條件下后行隧道施工使先行隧道拱頂和遠(yuǎn)中巖柱側(cè)邊墻位移增大，近中巖柱側(cè)邊墻位移減小，這必然引起初支及二襯受到偏壓作用；在偏壓作用下，初支鋼架在近中巖柱側(cè)邊墻位置壓應(yīng)力集中，發(fā)生彎曲破壞，同時(shí)后行隧道施工破壞了中巖柱中錨桿與圍巖粘結(jié)力，使近中巖柱側(cè)邊墻錨桿失去作用；后行隧道施工使先行隧道二襯在仰拱和拱頂產(chǎn)生拉破壞，在邊墻位置產(chǎn)生壓破壞，當(dāng)間距較小時(shí)，上述三種破壞同時(shí)發(fā)生，當(dāng)間距增大后，主要發(fā)生仰拱的拉破壞。 關(guān)鍵詞：隧道工程；高應(yīng)力；軟巖；小間距隧道；隧道變形；支護(hù)受力 Abstract：Due to the disturbance of the construction process, the deformation and structure of the small spacing tunnel in the condition of high stress and soft rock are extremely complicated, and the support structure is easy to be destroyed. Based on the theoretical analysis, field test and numerical simulation, the paper analyzes the characteristics of deformation and structural stress of small spacing tunnels in high stress soft rock at Yangjiaping tunnel of Chengdu-Lanzhou Railway, and summarizes the causes of support structure failure. First of all, numerical simulation method is used to analyze the influence of latter tunnel’s construction at different spacing on the deformation of the antecedent tunnel and compare with the measured data. Secondly, the monitoring section was set up to test the influence of latter tunnel’s construction on structure stress of antecedent tunnel. Lastly, combined with the deformation characteristics, the causes of the damage of secondary lining is summarized. The results show that, in the high stress condition, the displacement of the vault and the side wall away from middle rock wall are increased and the displacement of side wall near the middle rock wall is reduced after latter tunnel constructing, which will inevitably cause the primary lining and the secondary lining to be biased; Under the action of bias, the stress of steel frame in primary lining at the side wall near the middle rock wall is concentrated and then occurs bending failure, and the latter tunnel's construction destroys the bonding force between the rock bolt and the surrounding rock, the rock bolt in side wall near the middle rock wall failed; when the spacing is small,the latter tunnel’s construction makes antecedent tunnel’s secondary lining occur tensile failure in the inverted arch and vault, and pressure failure in the side wall, when the spacing increases, the main failure occurred in the inverted arch. Key words：tunnel engineering；high stress；soft rock；small spacing tunnel；tunnel deformation；structural stress |
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