本文選題：深基坑　切入點(diǎn)：既有隧道　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國(guó)城市化進(jìn)程的發(fā)展,地下空間的開(kāi)發(fā)與利用越來(lái)越受到重視,由此產(chǎn)生的大量位于城市繁華地段的基坑工程。而城市基坑工程周圍往往存在通信線路、地下水管線、地鐵隧道等其他市政設(shè)施,施工環(huán)境非常復(fù)雜。這類基坑的開(kāi)挖不僅涉及到基坑本身的安全與穩(wěn)定,同時(shí)還可能對(duì)臨近的建筑物、構(gòu)筑物造成影響。地鐵隧道有嚴(yán)格的變形限制,而基坑開(kāi)挖勢(shì)必造成周圍土體的變形,如果施工不當(dāng),則會(huì)影響鄰近地鐵隧道的運(yùn)行甚至造成安全問(wèn)題。本文以理論分析為指導(dǎo),采用數(shù)值模擬的方法,對(duì)基坑開(kāi)挖引起鄰近既有隧道的變形問(wèn)題做了分析,主要內(nèi)容及成果如下:1、介紹了基坑開(kāi)挖對(duì)臨近隧道變形的研究現(xiàn)狀,總結(jié)了基坑與隧道變形的理論、影響因素以及相關(guān)的理論計(jì)算方法。2、運(yùn)用單一變量法,保持基坑與隧道的豎向相位置不變,改變水平相對(duì)位置,用FLAC3D軟件進(jìn)行基坑開(kāi)挖全過(guò)程的模擬與分析,研究了隧道水平、豎向變形與兩者水平位置的關(guān)系。結(jié)果表明:隨著隧道與基坑相對(duì)距離的減小,隧道的水平變形和豎向變形逐漸增大;在本文工程的地質(zhì)條件下,2m位置為隧道變形臨界位置,若小于該值,則隧道的變形不滿足規(guī)范要求,需要采取特殊施工方法或是對(duì)基坑及隧道進(jìn)行加固處理。3、運(yùn)用單一變量法,保持基坑與隧道的水平相對(duì)位置不變,分別在基坑位于隧道側(cè)方與正下方時(shí),改變兩者的豎向相對(duì)位置,用FLAC3D進(jìn)行了模擬與分析,研究了隧道水平、豎向變形與兩者豎向位置的關(guān)系。結(jié)果表明:隨著兩者相對(duì)距離的減小,隧道的水平變形和豎向變形均逐漸增大,且水平變形小于豎向變形;隧道位于基坑正下方時(shí),由于土體隆起導(dǎo)致隧道的豎向變形較大;本文工程中4m位置為臨界位置;當(dāng)相對(duì)距離大于10m時(shí),基坑開(kāi)挖對(duì)隧道的變形影響很小。
[Abstract]:With the development of urbanization in China, more and more attention has been paid to the development and utilization of underground space. Other municipal facilities, such as subway tunnels, are constructed in a very complex environment. Such excavation involves not only the safety and stability of the foundation pit itself, but also the adjacent buildings. The subway tunnel has strict deformation limit, and the excavation of foundation pit is bound to cause the deformation of surrounding soil, if the construction is not proper, Based on the theoretical analysis and numerical simulation method, the deformation of adjacent existing tunnels caused by foundation pit excavation is analyzed. The main contents and results are as follows: 1. This paper introduces the research status of the deformation of the adjacent tunnel in foundation pit excavation, summarizes the theory of foundation pit and tunnel deformation, the influencing factors and the related theoretical calculation method .2. the single variable method is used. In order to keep the vertical phase position of foundation pit and tunnel unchanged and change the relative position of level, the whole excavation process of foundation pit is simulated and analyzed by FLAC3D software, and the tunnel level is studied. The results show that with the decrease of the relative distance between the tunnel and the foundation pit, the horizontal and vertical deformation of the tunnel increases gradually, and the 2 m position is the critical position of the tunnel deformation under the geological conditions in this paper. If the value is less than this value, the deformation of the tunnel does not meet the requirements of the code, so it is necessary to adopt special construction methods or reinforce the foundation pit and tunnel. The single variable method is used to keep the horizontal position of the foundation pit and tunnel unchanged. When the foundation pit is located on the side and directly below the tunnel, the vertical relative position of the two is changed, and the tunnel level is studied and simulated by FLAC3D. The results show that with the decrease of the relative distance between them, the horizontal and vertical deformation of the tunnel increases gradually, and the horizontal deformation is smaller than the vertical deformation, and the tunnel is located directly below the foundation pit. The vertical deformation of the tunnel caused by the uplift of the soil mass is larger; the critical position is 4m in this paper; when the relative distance is more than 10m, the excavation of foundation pit has little effect on the deformation of the tunnel.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U231;U456.3;TU753

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