本文關(guān)鍵詞：通—胡區(qū)間隧道暗挖施工對既有橋梁樁基礎(chǔ)的變形影響規(guī)律　出處：《西安科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地鐵隧道 暗挖施工 CRD法 地表變形 橋梁樁基礎(chǔ) FLAC模擬 控制措施 注漿加固 現(xiàn)場監(jiān)測

【摘要】：開展西安黃土地區(qū)地鐵區(qū)間隧道淺埋暗挖施工對既有橋梁基礎(chǔ)的變形影響規(guī)律研究具有重要的理論意義和工程參考價值。本文以西安地鐵三號線通化門~胡家廟區(qū)間隧道淺埋暗挖施工為依托工程，采用理論分析、數(shù)值模擬和現(xiàn)場監(jiān)測相結(jié)合的方法開展論文的研究工作，并提出相應(yīng)的變形控制技術(shù)。主要工作和結(jié)論有： （1）從理論方面分析了地層特性、地下水、隧道埋深、施工工法和開挖進(jìn)尺等因素對地表變形的影響規(guī)律和淺埋暗挖施工引起的地層變形特征。研究表明，鄰近樁基礎(chǔ)的埋深越大，淺埋暗挖隧道施工越容易引起基礎(chǔ)發(fā)生傾斜，同時淺埋暗挖隧道施工誘發(fā)的地層變形主要通過水平變形和豎向變形兩方面影響鄰近的橋梁樁基礎(chǔ)產(chǎn)生不同形式的變形�？偨Y(jié)歸納了隧道暗挖施工中常用的地表和橋梁樁基礎(chǔ)的變形控制措施，同時結(jié)合西安地區(qū)施工經(jīng)驗，提出了通—胡區(qū)間隧道暗挖施工誘發(fā)的地表和橋梁基礎(chǔ)的變形控制標(biāo)準(zhǔn)。 （2）采用FLAC3D軟件，研究通—胡區(qū)間隧道暗挖施工對既有橋梁樁基礎(chǔ)的變形影響規(guī)律。對比分析臺階法和CRD法兩種暗挖施工方法誘發(fā)的地表和東二環(huán)長樂橋的變形規(guī)律，模擬結(jié)果表明，相比于臺階法施工，CRD法施工誘發(fā)地表和長樂橋產(chǎn)生的變形均比較小，但施工中還是需要對橋梁提出變形控制措施。通過暗挖施工方案的比選，且考慮到飽和黃土地層施工降水困難問題，應(yīng)采用對橋梁樁基礎(chǔ)變形影響較小的CRD工法進(jìn)行濕陷性黃土地層的隧道施工。 （3）為控制CRD法施工所引起地表和既有橋梁基礎(chǔ)的變形，采用袖閥管注漿加固技術(shù)加固橋梁樁基礎(chǔ)周圍的地層土。結(jié)合實際工程，制定施工現(xiàn)場變形監(jiān)測方案，對比分析現(xiàn)場監(jiān)測結(jié)果和預(yù)測結(jié)果。研究表明，實測的地表沉降曲線和模擬預(yù)測的變形趨勢基本一樣，采用袖閥管注漿加固措施后，地表和長樂橋的變形控制在允許范圍內(nèi)，確保了暗挖隧道施工期間橋梁的安全運營。
[Abstract]:It is of great theoretical significance and engineering reference value to study the influence of shallow tunneling construction on the deformation of existing bridge foundation in Xi'an Loess region. This paper uses Tonghua Gate ~ Hujiamiao of Xi'an Metro Line 3 as a reference. The construction of shallow burying and digging in interval tunnel is based on the project. Theoretical analysis, numerical simulation and field monitoring are used to carry out the research work in this paper, and the corresponding deformation control techniques are put forward. The main work and conclusions are as follows: 1) the influence of ground characteristics, groundwater, tunnel depth, construction method and excavation rule on surface deformation and formation deformation characteristics caused by shallow underground excavation are analyzed theoretically. The larger the buried depth of the adjacent pile foundation, the more prone to the slope of the foundation caused by the shallow excavation tunnel construction. At the same time, the formation deformation induced by shallow excavation tunnel mainly affects the adjacent bridge pile foundation through horizontal deformation and vertical deformation. The paper summarizes and summarizes the ground surface commonly used in tunneling construction. And the deformation control measures of bridge pile foundation. Combined with the construction experience in Xi'an area, the deformation control standard of ground surface and bridge foundation induced by tunneling construction in Tonghu region is put forward. FLAC3D software is used. The influence of tunneling construction on the deformation of existing bridge pile foundation is studied, and the deformation law of surface and east second ring Changle bridge induced by step method and CRD method are compared and analyzed. The simulation results show that the deformation induced by the CRD method is smaller than that of the step method. However, it is still necessary to put forward deformation control measures for the bridge during construction. Through the comparison and selection of the construction scheme of the underground excavation, and considering the difficult problem of the construction of saturated loess layer, the problem of dewatering is also taken into account. The CRD method, which has little influence on the deformation of bridge pile foundation, should be used for tunnel construction of collapsible loess stratum. In order to control the deformation of the ground surface and the existing bridge foundation caused by the CRD method, the soil layer around the bridge pile foundation is strengthened with sleeve valve pipe grouting. The results of field monitoring and prediction are compared and analyzed. The results show that the measured surface settlement curve is basically the same as the simulated deformation prediction. The deformation of the ground surface and the Changle bridge is controlled within the allowable range after the sleeve valve pipe grouting is adopted to ensure the safe operation of the bridge during the construction of the underground excavation tunnel.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.15;U456.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 侯學(xué)淵,廖少明;盾構(gòu)隧道沉降預(yù)估[J];地下工程與隧道;1993年04期

2 張云;一維地面沉降模型及其求解[J];工程地質(zhì)學(xué)報;2002年04期

3 陳昆;;城市飽和水軟弱地層淺埋隧道施工地面沉降的控制[J];工程科技;2007年02期

4 史寶童;肖均;;風(fēng)積砂圍巖淺埋暗挖隧道施工技術(shù)[J];施工技術(shù);2011年07期

5 周誠;周少東;林濤;劉惠濤;;城市地鐵隧道區(qū)間淺埋暗挖施工地表沉降控制研究[J];施工技術(shù);2011年19期

6 吳波;劉維寧;索曉明;史玉新;;城市地鐵轉(zhuǎn)彎段施工對近鄰橋基的影響研究[J];探礦工程(巖土鉆掘工程);2006年02期

7 李懷鑒;張桂揚;;大斷面連拱隧道暗挖工法數(shù)值模擬研究[J];石家莊鐵道大學(xué)學(xué)報(自然科學(xué)版);2013年02期

8 李林;深圳地鐵區(qū)間隧道過軟弱地層的超前預(yù)加固施工技術(shù)[J];現(xiàn)代城市軌道交通;2005年04期

相關(guān)博士學(xué)位論文 前1條

1 趙衍發(fā);淺埋暗挖法下穿既有地鐵車站的風(fēng)險控制[D];北京交通大學(xué);2013年

，

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