【作者】 刘丽；

【导师】 李大勇；

【作者基本信息】 山东科技大学 ， 岩土工程， 2006， 硕士

【摘要】 地铁工程建设多滞后修建于高层建筑、高架桥梁等已高度密集的城市环境中。高层建筑、高架桥梁等建筑物多采用桩基基础，由于受线路、地下空间等的限制，地铁隧道不可避免的要近接基桩施工，施工中不可避免会引起周围土体的移动，土体的移动又会引起基桩产生附加变形和内力。基桩产生附加变形及内力又常会引起上部建筑物倾斜、墙体开裂等，给建筑物的正常使用及安全带来隐患。因此，研究地铁施工对邻近既有建筑基桩的影响，具有重要的现实意义。 在大型有限差分软件FLAC^3D平台上进行二次开发，利用内嵌FISH语言编写程序，模拟地铁隧道盾构法三维动态施工，研究盾构掘进过程中临近建筑物基桩的反应。考虑研究盾构掘进过程中土体位移变化规律是研究基桩反应的前提，论文第3章结合南京地铁工程实例，研究了盾构施工中周围土体的位移规律。论文第4章考虑地铁隧道与基桩的不同相对空间位置，研究了盾构法地铁隧道动态施工过程中基桩的反应，并研究了桩体弹性模量、桩长、桩径等因素对桩基反应的影响，得出了一些对实践有参考价值的结论。论文第5章提出了地铁隧道近接基桩施工的控制要点，总结了隧道近接基桩施工的保护措施，为实践中的类似施工提供工程借鉴。更多还原

【Abstract】 Tunnel projects usually occur in city where high-rise building and elevated bridge etc have badly concentrated. High-rise building’ foundations usually are pile foundation. Due to restrictions made by tunnel line and underground space, tunnels are built inevitably adjacent to pile foundations of present building. Construction of tunnels aroses inevitably displacement of around soils and soils displacement can bring additional internal force and displacement to pile foundation, which can bring hidden troubles to regular service and safety of building, such as building lean and wall crazing. It bears important practical signification to study influences which tunnel construction brings to present building pile foundation adjacent to tunnel.This thesis further develops finite difference software-FLAC^3D basing on it and compiles program using FISH language included in FLAC^3D software to simulate 3-dimension dynamic shield tunnel construction. Considering study of soil displacements law is precondition to study responses of pile foundation, soil displacements law around shield tunnel during tunnel construction have been studyed in chapter 3 of this thesis. Considering different relative space position between tunnel and pile foundation, the responses of pile foundation adjacent to tunnel to dynamic shield tunnel construction have been studyed in chapter 4 of this thesis. Moreover influences of Young’ modulus, length and radius of pile to pile foundation adjacent to tunnel have been studyed in chapter 4 of this thesis. Some conclusions have been educed which may guide practical project. In the end matters need attention when tunneling adjacent to pile foundation have been brought forward and construction measures of tunneling adjacent to pile foundation have been summed up in chapter 5 of this thesis, which can be used for reference of similar project in practice.更多还原