本文選題：地表沉降 + 既有隧道車站��； 參考：《湖南科技大學(xué)》2014年碩士論文

【摘要】：隨著城市地鐵隧道的發(fā)展，地鐵的網(wǎng)絡(luò)化已經(jīng)不可避免，新建隧道穿越既有隧道的情況將會(huì)越來越多，在這樣的穿越工程中，新建隧道的開挖必然會(huì)導(dǎo)致地表的沉降，但是由于既有隧道結(jié)構(gòu)的存在，，其相互作用關(guān)系極為復(fù)雜，這樣的地表沉降將不同于天然的地表沉降。而隧道對(duì)于周邊環(huán)境的主要影響表現(xiàn)在地表沉降上面，如何能正確的預(yù)測(cè)這類工程的地表沉降將會(huì)對(duì)此類工程有較大意義。 本文以武漢地鐵6號(hào)線下穿2號(hào)線常青花園工程為背景，通過理論分析、數(shù)值模擬以及現(xiàn)場(chǎng)監(jiān)測(cè)實(shí)驗(yàn)對(duì)既有隧道車站影響下，新建隧道開挖引起的地表沉降進(jìn)行了分析，得出了如下結(jié)論： （1）分析了地層沉降機(jī)理，并且結(jié)合本文工程實(shí)際，對(duì)本文情況進(jìn)行簡(jiǎn)化，結(jié)合Verruijt和Booker解，能夠得出符合工程現(xiàn)場(chǎng)實(shí)際情況的豎直位移計(jì)算公式。 （2）采用精密水準(zhǔn)儀對(duì)現(xiàn)場(chǎng)的施工沉降情況進(jìn)行實(shí)時(shí)監(jiān)控，對(duì)現(xiàn)場(chǎng)量測(cè)數(shù)據(jù)進(jìn)行分析，得出沉降規(guī)律。 （3）運(yùn)用FLAC軟件對(duì)于本工程的施工沉降進(jìn)行模擬，數(shù)值模擬的最大位移比實(shí)測(cè)位移值小了6.70mm，減小了10.3%，雖然比實(shí)際情況略小，但是能正確的反應(yīng)整體變化趨勢(shì)。同時(shí)運(yùn)用FLAC對(duì)既有隧道車站不同剛度、新建隧道不同埋深以及有、無既有隧道車站進(jìn)行模擬分析，結(jié)合理論計(jì)算公式進(jìn)行對(duì)比，發(fā)現(xiàn)既有隧道剛度和施工支護(hù)情況對(duì)地表沉降有較大影響，且由于本工程中既有隧道屬于超淺埋情況下，既有隧道對(duì)于地表沉降的影響范圍是限定在既有隧道本身的尺寸范圍之類的，對(duì)于其他位置的影響情況有限。
[Abstract]:With the development of urban subway tunnel, the subway network is inevitable, the new tunnel will pass through the existing tunnel more and more, in such a crossing project, the excavation of the new tunnel will inevitably lead to the settlement of the surface. However, due to the existence of the existing tunnel structure, the interaction relationship is very complex, such surface subsidence will be different from the natural surface subsidence. The main impact of tunnel on the surrounding environment is the surface subsidence. How to correctly predict the surface settlement of this kind of project will be of great significance to this kind of project. Based on the Changqing Garden Project of Wuhan Metro Line 6 and Line 2, the ground subsidence caused by the excavation of the new tunnel is analyzed by theoretical analysis, numerical simulation and field monitoring experiment. The conclusions are as follows: (1) the mechanism of ground subsidence is analyzed, and the situation of this paper is simplified, combined with Verruijt and Booker solution, combined with the engineering practice in this paper. The calculation formula of vertical displacement in accordance with the actual situation of engineering site can be obtained. The precision level is used to monitor the construction settlement in real time, and the field measurement data are analyzed. The results show that the maximum displacement of the numerical simulation is 6.70 mm smaller than the measured displacement value, which decreases 10.3%, although it is a little smaller than the actual situation, by using FLAC software to simulate the construction settlement of the project. But can correctly reflect the overall trend of change. At the same time, FLAC is used to simulate the different stiffness of the existing tunnel station, the different buried depth of the new tunnel and the station without the existing tunnel, and the comparison is made with the theoretical calculation formula. It is found that the stiffness of the existing tunnel and the condition of the construction support have great influence on the surface settlement, and because the existing tunnel in this project belongs to the condition of super shallow burial, The influence range of the existing tunnel on the surface settlement is limited to the size range of the existing tunnel itself, but the influence on other positions is limited.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U456.3

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