【摘要】：隨著我國經(jīng)濟(jì)社會的不斷發(fā)展，城市人口迅速膨脹，交通擁堵問題已成為制約城市發(fā)展的瓶頸，修建地鐵是解決該問題的重要途徑。然而由于受到地下空間及線路走向的制約，線路將不可避免的穿越軟弱地層及市政橋梁，在采用淺埋暗挖法施工時很容易對地層造成擾動，改變地層應(yīng)力場和位移場的分布，引起地表沉降，樁基發(fā)生位移，隧道結(jié)構(gòu)產(chǎn)生變形或破壞，尤其是不合理的施工方法和支護(hù)措施，將給工程帶來巨大安全風(fēng)險和經(jīng)濟(jì)損失，因此研究不同的施工方法和支護(hù)措施對地表下沉、隧道結(jié)構(gòu)及鄰近樁基變形的影響具有重要的現(xiàn)實(shí)意義。為分析不同施工方法及支護(hù)措施的影響，，文中依據(jù)一定的判別標(biāo)準(zhǔn)，采用理論分析與數(shù)值計(jì)算的方法對其進(jìn)行了研究，以下為論文的主要內(nèi)容和研究成果： (1)本文歸納了國內(nèi)外淺埋暗挖隧道對地層變形、鄰近樁基影響的現(xiàn)狀，并總結(jié)了注漿加固在軟弱地層中應(yīng)用的案例，然后從隧道施工力學(xué)的角度探討了地層變形、樁基移位的基本原理，最后從隧道施工技術(shù)的角度研究了隧道施工和注漿加固的方法，并依據(jù)規(guī)范、文獻(xiàn)及工程經(jīng)驗(yàn)制定了地表沉降、圍巖失穩(wěn)、結(jié)構(gòu)破壞、樁基變形的判別標(biāo)準(zhǔn)。 (2)結(jié)合蘭州地鐵一號線焦家灣～東崗區(qū)間隧道穿越魚兒溝橋工程，運(yùn)用大型有限元軟件ANSYS建立三維計(jì)算模型，計(jì)算分析臺階法、預(yù)留核心土法、CRD法對地表沉降、圍巖塑性變形、襯砌結(jié)構(gòu)變形和內(nèi)力、樁基變位的影響規(guī)律，最后利用之前建立的判據(jù)分析各工法的優(yōu)劣，從而選擇合理的工法。 (3)在選定工法的基礎(chǔ)上分析討論不同開挖進(jìn)尺對地表沉降、圍巖塑性變形、襯砌結(jié)構(gòu)變形和內(nèi)力、樁基變位的影響規(guī)律，通過一定的判別標(biāo)準(zhǔn)，比較不同開挖進(jìn)尺的施工安全性，從而選擇合理的開挖進(jìn)尺。 (4)在施工工法及開挖進(jìn)尺一定的情況下，計(jì)算分析隧道拱部不同注漿范圍對地表沉降、圍巖塑性變形、襯砌結(jié)構(gòu)變形和內(nèi)力、樁基變位的影響規(guī)律，利用文中建立的判據(jù)比較分析不同注漿范圍的施工安全性、經(jīng)濟(jì)性，從而選擇合理的注漿范圍。
[Abstract]:With the development of our country's economy and society, the urban population is expanding rapidly. Traffic congestion has become the bottleneck of the urban development. The construction of subway is an important way to solve this problem. However, due to the restriction of underground space and route direction, the line will inevitably cross the soft stratum and municipal bridge. It is easy to disturb the formation and change the distribution of stress field and displacement field when using shallow underground excavation method. Ground subsidence, displacement of pile foundation, deformation or destruction of tunnel structure, especially unreasonable construction methods and supporting measures, will bring huge safety risk and economic loss to the project. Therefore, it is of great practical significance to study the influence of different construction methods and supporting measures on the deformation of surface subsidence, tunnel structure and adjacent pile foundation. In order to analyze the influence of different construction methods and supporting measures, the theoretical analysis and numerical calculation methods are used to study them according to certain discriminant standards. The following are the main contents and achievements of the thesis: (1) this paper summarizes the present situation of the influence of shallow tunneling on formation deformation and adjacent pile foundation at home and abroad, and summarizes the case of grouting reinforcement in soft stratum. Then from the angle of tunnel construction mechanics, the basic principles of stratum deformation and pile foundation displacement are discussed. Finally, the methods of tunnel construction and grouting reinforcement are studied from the point of view of tunnel construction technology, and according to the specifications, The criteria of ground subsidence, rock instability, structural damage and pile foundation deformation have been established by literature and engineering experience. (2) combined with the project of crossing Yuergou Bridge of Jiaojiawan-Donggang Tunnel of Lanzhou Metro Line 1, the three-dimensional calculation model is established by using large-scale finite element software ANSYS, and the surface settlement is calculated and analyzed by step method, reserved core soil method and CRD method. The influence law of surrounding rock plastic deformation, lining structure deformation and internal force, pile foundation displacement is analyzed. Finally, the advantages and disadvantages of each construction method are analyzed by using the criteria established before, and the reasonable construction method is selected. (3) on the basis of the selected engineering method, the influence of different excavations on surface subsidence, plastic deformation of surrounding rock, deformation of lining structure and internal force, displacement of pile foundation is analyzed and discussed. Compare the construction safety of different excavation advance, and select reasonable excavation advance. (4) under the condition of certain construction method and excavation advance, the influence of different grouting range of tunnel arch on surface settlement, plastic deformation of surrounding rock, deformation of lining structure and internal force, displacement of pile foundation is calculated and analyzed. By comparing and analyzing the construction safety and economy of different grouting range, the reasonable grouting range is selected by using the criteria established in this paper.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.4;U231.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 黃宏偉;城市隧道與地下工程的發(fā)展與展望[J];地下空間;2001年04期

2 蘇潔;張頂立;牛曉凱;;地鐵淺埋暗挖法穿越既有橋梁施工變形控制[J];北京工業(yè)大學(xué)學(xué)報;2009年05期

3 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

4 徐永福,孫鈞;隧道盾構(gòu)掘進(jìn)施工對周圍土體的影響[J];地下工程與隧道;1999年02期

5 施仲衡,馮愛軍;城市軌道交通技術(shù)發(fā)展戰(zhàn)略探討[J];都市快軌交通;2004年04期

6 侯玉偉;;盾構(gòu)隧道側(cè)向穿越樁基時對樁體土體及地面變形的影響[J];城市軌道交通研究;2010年05期

7 畢露成,朱鍇;雙液注漿錨管加固在滲水軟弱圍巖淺埋偏壓隧道中的應(yīng)用[J];廣州大學(xué)學(xué)報(綜合版);2001年08期

本文編號：2324549