發(fā)布時(shí)間：2018-03-08 06:40

  本文選題：隧道　切入點(diǎn)：滑坡　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：滑坡及軟弱圍巖的存在給隧道的建設(shè)及后期的運(yùn)營帶來了較大的挑戰(zhàn),如何對軟弱圍巖的變形進(jìn)行有效的控制,確保隧道—滑坡體系在施工及運(yùn)營過程中的安全是工程設(shè)計(jì)與施工面臨的一個難題。本文以渭河隧道下穿北山滑坡段為背景,針對隧道下穿巨型滑坡與軟巖大斷面的工程特點(diǎn),通過資料調(diào)查,工程類比,數(shù)值模擬,現(xiàn)場監(jiān)控量測等方法和手段,展開對圍巖變形控制技術(shù)與隧道—滑坡相互作用關(guān)系的研究,最終提出了一套有效的軟弱圍巖變形控制施工方法。主要研究內(nèi)容及成果如下：(1)通過對工程文獻(xiàn)資料的調(diào)查研究,總結(jié)了軟巖隧道及類似工程常用開挖支護(hù)方法的特點(diǎn)和應(yīng)用現(xiàn)狀。(2)通過隧道開挖與支護(hù)對圍巖穩(wěn)定影響的理論分析,結(jié)合軟巖的力學(xué)特征與渭河隧道下穿滑坡施工段的工程特點(diǎn),對隧道開挖后可能出現(xiàn)的問題進(jìn)行了預(yù)測,并針對以上可能出現(xiàn)的問題提出了3種開挖支護(hù)方案。(3)結(jié)合渭河隧道下穿滑坡段的實(shí)際工程情況,對本文提出的3種開挖支護(hù)方案的地層—結(jié)構(gòu)力學(xué)行為特征進(jìn)行了數(shù)值模擬分析,表明“雙側(cè)壁導(dǎo)坑—加強(qiáng)型復(fù)合式襯砌結(jié)構(gòu)”方案在控制圍巖變形,保證支護(hù)結(jié)構(gòu)安全方面具有明顯的優(yōu)勢,因此,推薦該方案作為渭河隧道下穿滑坡段施工的優(yōu)選方案。(4)通過數(shù)值模擬結(jié)果,分析了隧道—滑坡體系相互作用的兩種表現(xiàn)形式,并指出在渭河隧道下穿滑坡施工段,隧道開挖對滑坡體的影響較小,而極端條件下的降雨會對滑坡體的穩(wěn)定造成較大影響,應(yīng)該作為安全控制的重點(diǎn)。(5)對渭河隧道下穿滑坡施工段進(jìn)行了現(xiàn)場監(jiān)控量測,監(jiān)測結(jié)果表明：本文提出的“雙側(cè)壁導(dǎo)坑—加強(qiáng)型復(fù)合式襯砌結(jié)構(gòu)”方案對軟弱圍巖的變形能起到較好的控制作用。同時(shí),通過監(jiān)測數(shù)據(jù)與數(shù)值模擬結(jié)果的比較,證明了本文采用的數(shù)值模擬方法是可行的,能基本反映工程的實(shí)際情況。
[Abstract]:The existence of landslide and soft surrounding rock brings great challenge to tunnel construction and later operation. How to control the deformation of soft surrounding rock effectively, It is a difficult problem for engineering design and construction to ensure the safety of tunnel-landslide system during construction and operation. This paper takes the Weihe tunnel under the Beishan landslide as the background, aiming at the engineering characteristics of giant landslide and large section of soft rock under the tunnel. Through the methods and means of data investigation, engineering analogy, numerical simulation, field monitoring and measurement, the study on the relationship between the deformation control technology of surrounding rock and the interaction between tunnel and landslide is carried out. Finally, a set of effective construction methods for controlling the deformation of weak surrounding rock are put forward. The main research contents and results are as follows: 1) through the investigation and study of engineering literature, This paper summarizes the characteristics and application status of common excavation and support methods for soft rock tunnel and similar projects. The influence of tunnel excavation and support on the stability of surrounding rock is analyzed theoretically. Combined with the mechanical characteristics of soft rock and the engineering characteristics of the construction section of Weihe tunnel through landslide, the possible problems after tunnel excavation are forecasted. In view of the above possible problems, three kinds of excavation and support schemes are put forward, which are combined with the actual engineering situation of the landslide section under the Weihe tunnel. In this paper, the characteristics of stratigraphic and structural mechanical behavior of three kinds of excavation and support schemes proposed in this paper are numerically simulated and analyzed. The results show that the scheme of "double sidewall guide pit reinforced composite lining structure" is used to control the deformation of surrounding rock. In order to ensure the safety of the supporting structure, it is recommended that the scheme should be used as the optimal scheme for the construction of the underpass landslide section of the Weihe tunnel. Through the numerical simulation results, the two forms of the interaction between the tunnel and the landslide system are analyzed. It is also pointed out that the influence of tunnel excavation on landslide is relatively small, while rainfall under extreme conditions will have a great impact on the stability of landslide. It should be regarded as the key point of safety control.) the construction section of Weihe tunnel under the landslide is monitored and measured on the spot. The monitoring results show that the "double-sidewall guide pit reinforced composite lining structure" scheme proposed in this paper can control the deformation of soft surrounding rock better. At the same time, through the comparison of monitoring data and numerical simulation results, It is proved that the numerical simulation method used in this paper is feasible and can basically reflect the actual situation of the project.
【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】：2015
【分類號】：U455.49

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