地铁盾构隧道近接桩基的施工力学行为研究
摘要
随着高速的社会发展，城市人口量和车流量的不断增多，为缓解交通压力，地下空间的利用被重视，城市地铁成为了最普遍便捷的交通工具。隧道盾构施工由于自动化程度高、对附近建筑、交通干扰较小而被广泛使用。但盾构施工过程中，对周围土体产生的扰动，容易引发地层不同程度的变形和沉降。近接桩基施工时，土层的沉降使桩基产生水平和竖向的内力。本文主要研究盾构施工对地层沉降变形的影响以及盾构施工引起桩基内力变化规律，课题利用有限元分析法选取最优开挖点减少对邻近桩基的影响，通过理论分析，数值模拟试验法开展地层沉降监测工作。对研究盾构施工近接桩基施工力学行为研究有重要意义。
关键词：地铁盾构；近接桩基；有限元分析
Research on mechanics behavior of a shield tunnel construction in metro adjacent to existing pile foundation
Abstract
With the rapid social development, the urban population and traffic flow are increasing. In order to alleviate the traffic pressure, the use of underground space has been paid attention to, and the urban subway has become the most popular and convenient means of transportation. Shield tunneling is widely used for its high degree of automation, less disturbance to nearby buildings and traffic. But in the process of shield tunneling construction, the disturbance to the surrounding soil will lead to different degrees of deformation and settlement of the stratum. During the construction of adjacent pile foundation, the settlement of soil layer causes horizontal and vertical internal forces. This paper mainly studies the influence of shield construction on ground settlement deformation, and the change rule of internal force of pile foundation caused by shield construction. The subject USES the finite element analysis method to select the optimal excavation point to reduce the influence on adjacent pile foundation, and carries out the ground settlement monitoring through theoretical analysis and numerical simulation test method. It is of great significance to study the mechanical behavior of shield construction near pile foundation.
Key word：subway shield ；proximity pile foundation；finite element analysis
第一章 绪论
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