本文關鍵詞：基坑開挖對側方地鐵盾構隧道的變形影響及控制措施研究　出處：《華南理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 基坑 側方開挖 盾構隧道 數(shù)值模擬 變形 控制措施

【摘要】：地鐵沿線高強度、高密度的物業(yè)開發(fā)，必然會產(chǎn)生大量的深基坑工程，鄰近地鐵側方深基坑開挖便是其中最常見的一種外部作業(yè)形式。由于開挖卸荷量大，使得周邊土體的位移場和應力場變化較大，加之所處工程地質條件的復雜性，施工過程中極易誘發(fā)盾構隧道管片開裂、滲漏水、接縫張開等病害，從而影響地鐵的結構安全及正常運營。 目前關于基坑開挖對側方地鐵隧道的影響多針對單一工程實例展開，且以盾構隧道變形量為控制目標的基坑變形控制研究還不夠完善，因此，研究基坑施工對鄰近盾構隧道的變形影響規(guī)律，并根據(jù)盾構隧道保護標準采取針對性的基坑變形控制措施，是有效實現(xiàn)地鐵隧道安全保護的關鍵。 本文采用有限元數(shù)值分析方法，系統(tǒng)地研究了基坑開挖對側方盾構隧道的變形影響，并分析了控制地鐵隧道變形的相關措施及其工程應用。具體作了如下方面的研究： （1）調研了廣州地鐵側方基坑開挖對既有盾構隧道影響的工程實例，分析了盾構隧道的橫向變形及縱向變形特征，總結了基于Mindlin解和Winkler地基梁理論求解盾構隧道縱向變形的方法。 （2）基于有限元法模擬分析了基坑開挖全過程對側方盾構隧道的影響，重點分析了支護結構的變形及受力變化、隧道的橫向變形、縱向變形特點及受力變化情況。 （3）分析了側方地鐵盾構隧道變形的相關影響因素，并研究了基坑水平凈距、盾構隧道埋深變化、基坑開挖深度、基坑支護體系剛度、基坑方位及尺寸變化、逆作法施工的影響；研究了開挖卸荷下不同影響因素對側方盾構隧道的變形影響規(guī)律。 （4）提出了地鐵隧道側方基坑變形控制值的確定流程，并在本文算例基礎上計算特定條件（水平凈距、埋深等）下對應的基坑變形控制值。最后，，總結并分析了地鐵盾構隧道側方基坑的變形控制措施及其工程應用情況。
[Abstract]:High intensity and high density property development along the subway will inevitably produce a large number of deep foundation pit projects, adjacent to the subway side deep foundation pit excavation is one of the most common form of external operation, because of the large amount of excavation unloading. The displacement field and stress field of surrounding soil are changed greatly, in addition to the complexity of the engineering geological conditions, the shield tunnel segment cracking, water leakage, joint opening and other diseases are easily induced in the construction process. Thus affecting the subway structure safety and normal operation. At present, the influence of foundation pit excavation on lateral subway tunnel is mostly focused on a single engineering case, and the research on foundation pit deformation control with shield tunnel deformation as the control target is not perfect, so. It is the key to effectively realize the safety protection of subway tunnel to study the influence of foundation pit construction on the deformation of adjacent shield tunnel and to take appropriate measures to control the deformation of foundation pit according to the protection standard of shield tunnel. In this paper, the influence of excavation on the deformation of side shield tunnel is systematically studied by using finite element numerical analysis method. The paper also analyzes the relative measures of controlling the deformation of subway tunnel and its engineering application. 1) an engineering example of the influence of excavation on the existing shield tunnel is investigated, and the characteristics of transverse and longitudinal deformation of shield tunnel are analyzed. The method of calculating longitudinal deformation of shield tunnel based on Mindlin solution and Winkler foundation beam theory is summarized. 2) based on finite element method, the influence of excavation process on lateral shield tunnel is simulated, and the deformation and stress change of supporting structure and transverse deformation of tunnel are analyzed emphatically. Longitudinal deformation characteristics and mechanical changes. This paper analyzes the influence factors of the deformation of shield tunnel in lateral subway, and studies the horizontal net distance of foundation pit, the change of buried depth of shield tunnel, the excavation depth of foundation pit, and the stiffness of foundation pit support system. The change of orientation and size of foundation pit and the influence of reverse construction; The influence of different factors on the deformation of side shield tunnel under excavation unloading is studied. (4) the flow of determining the deformation control value of tunnel lateral foundation pit is put forward, and the corresponding deformation control value of foundation pit under certain conditions (horizontal net distance, buried depth, etc.) is calculated on the basis of an example in this paper. Finally. This paper summarizes and analyzes the deformation control measures and engineering application of the side foundation pit of shield tunnel.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.43;U231.3

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