【摘要】：21世紀(jì)隨著城市軌道交通及高速鐵路的快速發(fā)展,地鐵穿越高速鐵路的工程不斷出現(xiàn)。因此,在地鐵盾構(gòu)穿越高速鐵路工程施工前,預(yù)測(cè)開(kāi)挖引起的地層、路基和軌道等結(jié)構(gòu)的最大變形和應(yīng)力,研究軌道等結(jié)構(gòu)的變形和應(yīng)力規(guī)律,提出穿越路基型高速鐵路采用的控制措施,對(duì)于地鐵盾構(gòu)穿越既有高速鐵路工程具有非常重要的現(xiàn)實(shí)意義。 本文以地鐵十號(hào)線下穿京滬高鐵和地鐵十四號(hào)線下穿京津城際、京滬高鐵為背景,應(yīng)用大型有限元軟件模擬了地鐵盾構(gòu)穿越高速鐵路的動(dòng)態(tài)施工過(guò)程。通過(guò)理論分析和數(shù)值模擬等方法,研究了地層條件、地鐵埋深、雙線水平間距和盾構(gòu)施工參數(shù)(注漿效果、注漿壓力和掌子面推力)等因素對(duì)地鐵施工引起的地層、路基和軌道結(jié)構(gòu)的變形及應(yīng)力影響程度及其規(guī)律,提出地鐵盾構(gòu)穿越路基型高速鐵路的建議控制標(biāo)準(zhǔn)及關(guān)鍵控制措施。 主要完成以下四方面的工作： (1)闡述了盾構(gòu)施工對(duì)高速鐵路的影響是一個(gè)動(dòng)態(tài)過(guò)程,同時(shí)也是地鐵、地層和高速鐵路結(jié)構(gòu)相互作用的過(guò)程,提出了以地鐵盾構(gòu)、地層土體和高速鐵路為主體三者構(gòu)成了一個(gè)包含多元結(jié)構(gòu)、多因素的綜合作用體系,最終通過(guò)相互作用形成新的平衡。 (2)通過(guò)建立三維有限元模型,研究了地鐵盾構(gòu)穿越高速鐵路工程中地層條件、地鐵埋深、雙線水平間距和盾構(gòu)施工參數(shù)(注漿效果、注漿壓力和掌子面推力)等因素對(duì)結(jié)構(gòu)變形及受力的影響程度及規(guī)律,提出各影響因素與結(jié)構(gòu)變形及應(yīng)力之間的定性關(guān)系。 (3)以相關(guān)規(guī)范及本文研究?jī)?nèi)容為基礎(chǔ),提出了地鐵下穿路基型高速鐵路變形及應(yīng)力的建議控制標(biāo)準(zhǔn)。 (4)提出從穿越工程影響來(lái)源、傳播路徑和保護(hù)對(duì)象三個(gè)方面考慮的施工關(guān)鍵控制措施,通過(guò)數(shù)值計(jì)算分析了三個(gè)方面的控制措施對(duì)高速鐵路結(jié)構(gòu)變形和應(yīng)力控制能力的有效性。
[Abstract]:With the rapid development of urban rail transit and high-speed railway in the 21st century, the project of subway traversing high-speed railway appears constantly. Therefore, before the construction of subway shield through high-speed railway engineering, the maximum deformation and stress of strata, roadbed and track caused by excavation are predicted, and the deformation and stress law of track and other structures are studied. It is of great practical significance to put forward the control measures adopted through the high-speed railway through the base of the subway shield machine for the existing high-speed railway project. Based on the background of Beijing-Shanghai high-speed railway and Beijing-Tianjin high-speed railway under subway line 10 and Beijing-Tianjin intercity and Beijing-Shanghai high-speed railway, the dynamic construction process of subway shield machine passing through high-speed railway is simulated by using large-scale finite element software. By means of theoretical analysis and numerical simulation, the formation conditions, subway buried depth, two-line horizontal spacing and shield construction parameters (grouting effect, grouting pressure and palm surface thrust) are studied. The influence degree and law of deformation and stress of subgrade and track structure are discussed in this paper. The proposed control standard and key control measures for subway shield traversing high-speed railway are put forward. The main work is as follows: (1) the influence of shield construction on high-speed railway is a dynamic process, and it is also a process of interaction among subway, stratum and high-speed railway structure. Stratum and soil mass and high-speed railway as the main body constitute a multi-structural, multi-factor comprehensive action system, finally through the interaction to form a new balance. (2) through the establishment of a three-dimensional finite element model, the ground conditions, the buried depth of subway, the horizontal distance between two lines and the parameters of shield construction (grouting effect) are studied in the project of subway shield crossing through high-speed railway. The influence degree and law of grouting pressure and palm face thrust on the deformation and stress of the structure are discussed, and the qualitative relationship between the influence factors and the deformation and stress of the structure is put forward. (3) on the basis of the relevant codes and the research contents of this paper, the proposed control standards for deformation and stress of subway underpass high-speed railway are put forward. (4) the key control measures are put forward from three aspects: the source of influence, the path of propagation and the object of protection. The effectiveness of the control measures in three aspects to the deformation and stress control ability of high-speed railway structure is analyzed by numerical calculation.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U231.3;U455.43

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