【作者】 洪杰；

【导师】 张我华； 魏新江； 魏纲；

【作者基本信息】 浙江大学 ， 岩土工程， 2013， 博士

【摘要】 随着城市建设的发展,土地资源日益减少,交通不断拥堵等问题日益突出。盾构隧道施工在城市地下空间开发中发挥着重要的作用。盾构施工扰动引起的环境效应是城市环境土工学的一个重要课题。盾构隧道在施工过程中不可避免地对周围土体产生扰动,进而危及周围邻近建(构)筑物及其基础和地下管线等的安全和正常使用。目前对于双圆盾构工法引起的注浆效应,土体位移、附加应力等尚缺乏足够的认识,探索双圆盾构工法的引起的土体扰动及其对周边构筑物的影响规律研究既是生产实践需求,也具有一定的理论研究价值。本文围绕双圆盾构其独特的施工工艺,从工厂需求出发,进行了多方面的研究。主要工作和研究成果如下：(1)基于广义达西定理和两类流体方程,对双圆盾构隧道管片同步注浆扩散机理进行分析,分别推导了牛顿流体、非牛顿宾汉姆流体的管片注浆的浆液扩散半径公式,可计算管片同步注浆工艺参数及不同注浆时间盾尾空隙中浆液扩散半径的大小与及管片环向压力分布。(2)基于随机介质理论推导了双圆盾构由于土体损失引起的三维土体变形计算公式、同时运用Mindlin解建立考虑刀盘正面、侧面与土体摩擦所引起的三维土体变形计算公式,结合双圆盾构掘进正面附加推力、侧摩阻力引起的土体变形,盾尾注浆力引起的土体变形叠加得到双圆盾构施工引起的三维土体变形计算公式。(3)应用Sagaseta"源汇法”理论,推导了土体损失产生的三维附加应力计算公式。结合弹性力学的Mindlin解推导了双圆盾构掘进正面附加推力、侧摩阻力引起的土体附加应力,盾尾注浆力引起的土体变形叠加得到双圆盾构施工引起的三维土体附加应力计算公式。(4)在考虑正面附加推力、侧摩阻力引起的土体变形,盾尾注浆力三个因素作用下,分别分析了双圆盾构施工对临近地下管线、建筑物桩基、平行既有隧道的影响。(5)采用三维MIDAS/GTS软件,考虑建筑物-土体-隧道共同作用,模拟了双圆盾构隧道垂直穿越十字交叉梁基础框架结构建筑物的工况,并分析该施工对建筑物的影响。更多还原

【Abstract】 With the development of urban construction, land resources are dwindling, and traffic congestion and other problems have become increasingly prominent. Shield tunneling plays an important role in the development of urban underground space. The effects of shield construction disturbances on surrounding environmental are an important topic of urban environmental geotechnics. Surrounding soil is inevitably disturbed during shield tunneling construction, and thus it endangers the neighboring building (structure) building, its foundation and adjacent underground pipelines and so on. For grouting effect, soil displacement and additional stress caused by the Double-O-Tube (DOT) shield tunnel method, is still a lack of sufficient knowledge, it is important to explore the law of soil disturbance and its impact on the surrounding structures caused by DOT shield tunneling. Not only has it production practice needs, but also has some theoretical research value. From the theoretical research needs, this dissertation focuses on the its unique construction technology of DOT shield tunnel to carry out a wide range of research. The main work and results are as follows:Based on the generalized Darcy and two types of fluid equations, synchronous grouting diffusion mechanism of DOT shield tunnel segment was analyzed. Newtonian fluid, non-Newtonian Bingham fluid segment slurry grouting diffusion radius formula were separately derived, which can calculate the synchronous grouting parameters and size of the slurry diffusion radius in segment shield tail void and the pressure distribution of segment ring at different time.Based on the random medium theory, the three-dimensional (3D) soil deformation calculation formula caused by soil loss is derived in Double-O-Tube (DOT) shield tunneling. Considering the friction between the cutter facade, side and soil, the soil3D soil displacement formulas were deduced by caused by using Mindlin solution. Combined with additional driving positive force, frictional resistance force, shield tail grouting force, the3D soil deformation formula of caused by DOT construction caused by three-dimensional soil displacement formula was deduced.Based on the source-sink method, the three-dimensional additional stress formula caused by DOT shield tunnel construction soil loss was derived. Combined with additional driving positive force, frictional resistance force, shield tail grouting force, the3D soil additional stress formula of caused by DOT construction caused by three-dimensional additional stress formula was deduced.Combined with additional driving positive force, frictional resistance force, shield tail grouting force, the effect of DOT shield tunnel construction on adjacent underground pipelines, buildings pile, parallel existing tunnel were separately analyzed.Considering the interaction of building-soil-tunnel, the grillage beams foundation frame building vertical crossed by DOT shield tunnel was simulated by3D MIDAS/GTS software, and the impact of construction on the building was analyzed.更多还原