【摘要】：地下盾構(gòu)軌道在線路的選擇上，由于受規(guī)劃及建、構(gòu)筑物的制約，通常需要采用小曲率半徑的曲線隧道繞過(guò)城市中密集的建筑物和各種管道等障礙物，從城市地下隧道的長(zhǎng)遠(yuǎn)發(fā)展來(lái)看，小曲率半徑隧道修建任務(wù)必將越來(lái)越多。但小曲率半徑隧道的盾構(gòu)施工過(guò)程中的土體變形、隧道管片應(yīng)力情況以及引起的環(huán)境安全問(wèn)題非常復(fù)雜，是盾構(gòu)隧道施工設(shè)計(jì)和施工安全的關(guān)鍵性問(wèn)題，，直接關(guān)系到工程的施工安全、質(zhì)量和造價(jià)。 本文針對(duì)小曲率半徑轉(zhuǎn)彎段盾構(gòu)施工隧道特性，制定了小曲率半徑轉(zhuǎn)彎段隧道盾構(gòu)施工對(duì)周邊土體變形、土體應(yīng)力與隧道管片應(yīng)力影響的監(jiān)測(cè)方案。通過(guò)現(xiàn)場(chǎng)原位試驗(yàn)，對(duì)小曲率半徑轉(zhuǎn)彎段盾構(gòu)隧道施工時(shí)的土體分層沉降、深層水平位移、孔隙水壓力、土壓力和隧道管片應(yīng)力進(jìn)行監(jiān)測(cè)。結(jié)合現(xiàn)場(chǎng)情況及現(xiàn)有的相關(guān)理論，對(duì)監(jiān)測(cè)數(shù)據(jù)進(jìn)行分析，得出以下成果： （1）小曲率半徑隧道轉(zhuǎn)彎段盾構(gòu)施工引起土體位移、土體孔隙水壓力和土壓力的變化規(guī)律。 （2）小曲率半徑隧道轉(zhuǎn)彎段盾構(gòu)施工引起管片軸向應(yīng)力和環(huán)向應(yīng)力的變化規(guī)律。 同時(shí)，將小曲率半徑隧道轉(zhuǎn)彎段的以上規(guī)律與直線段盾構(gòu)隧道進(jìn)行對(duì)比，得出其特性，可為小曲率半徑隧道的設(shè)計(jì)、施工及環(huán)境安全保護(hù)提供參考。
[Abstract]:In the selection of underground shield track, due to the restriction of planning, construction and structure, it is usually necessary to use a curved tunnel with small curvature radius to bypass the dense buildings and all kinds of pipelines in the city. From the long-term development of urban underground tunnel, the construction task of small curvature radius tunnel will be more and more. However, the deformation of soil, the stress of tunnel segment and the environmental safety problems caused by the shield construction of small curvature radius tunnel are very complex, which are the key problems in the construction design and construction safety of shield tunnel. It is directly related to the construction safety, quality and cost of the project. According to the characteristics of shield construction in the turning section of small curvature radius, the monitoring scheme of the influence of shield construction on the deformation of surrounding soil, soil stress and tunnel segment stress is worked out in this paper. Through in situ test, the layered settlement, deep horizontal displacement, pore water pressure, earth pressure and tunnel segment stress in shield tunnel construction with small curvature radius turning section are monitored. Combined with the field situation and the existing related theories, the monitoring data are analyzed, and the following results are obtained: (1) the variation of soil displacement, soil pore water pressure and soil pressure caused by shield construction of small curvature radius tunnel. (2) the variation of axial stress and circumferential stress of segment caused by shield construction in curved section of tunnel with small curvature radius. At the same time, the above laws of the turning section of the small curvature radius tunnel are compared with those of the straight line shield tunnel, and its characteristics are obtained, which can provide a reference for the design, construction and environmental safety protection of the small curvature radius tunnel.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

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