【作者】 李坤；

【导师】 蔡袁强；

【作者基本信息】 浙江大学 ， 岩土工程， 2003， 硕士

【摘要】 城市地下交通系统在世界各国大城市近年来呈现迅速增长的趋势，尤其是那些面临交通问题的城市。地下交通系统的发展需要建设隧道，隧道工程往往引起地层移动和变形。由于城市隧道多建在建筑物已高度集中的地区，这些变形和沉降对邻近固有建(构)筑物和设施的损伤不可忽视。城市中很多高层建筑采用的是桩基础，隧道工程引起的地层移动会对桩基础施加轴向和侧向力。因此研究隧道工程对于周围土体和邻近桩基的影响就显得尤为重要。 本文首先总结了目前国内外隧道工程引起的地层移动以及邻近桩反应研究的现状，简要的介绍了土体本构模型理论以及地层移动理论。然后介绍了论文中所采用的有限元分析软件ABAQUS，并使用该软件进行了二维有限元分析。模型中考虑了土和衬砌、土和桩体之间的接触面作用，采用Mohr-Coulomb弹塑性本构模型进行计算分析。 研究内容主要包括两部分，一是分析自由场的地层竖向和水平向位移，即无桩情况下隧道工程施工对于周围土体的影响，并把用有限元分析得到的结果与用弹性解析解得到的结果进行了比较；二是考虑分析隧道工程对邻近桩体的影响，分析桩体反应。更多还原

【Abstract】 Underground transportation systems have increased rapidly in many large cities these years in the world,especially those facing a problem with traffic. This system requires a tunnel construction which generates ground displacements and deformations which can affect the preexisting buildings and main services in urban sites and could lead to unacceptable damages. In an urban environment,many high-rise buildings are supported by pile foundations and tunneling almost invariably will cause ground movements,which in turn will impose axial and lateral forces on the pile foundations. So it is important to research the effects of tunneling on soil around and adjacent pile foundations.In this thesis,the author first takes a review on the computational theories of the ground movements and pile responses induced by tunnelling. Second,a brief introduction is made about theories of constitutive models and ground movements. Then a few words are said about the Finite Element Analysis Software-ABAQUS,which is used to analyze the ground movements and pile responses in a two-dimension FEA model. The contact interactions between soil and lining,and between soil and pile are taken into account. The constitutive model employed is Mohr-Coulomb plasticity with linear elasticity assumed within the yield strength surface.The main study of this thesis includes two parts. First,estimation of the free-field ground movements induced by tunneling (both vertical and horizontal),i.e.,the effects of tunneling on soil around without the presence of the pile,and comparing the results with the elastic analytical results;second,the imposition of these movements on the adjacent pile and the computation of the consequent pile responses.更多还原