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盾构隧道掘进对邻近建筑物影响及变形预测研究
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摘要
盾构法已成国内外地铁隧道建设的主要施工方法之一,但仍将会对施工影响范围内土体产生扰动从而造成土体位移,变形过大会导致邻近建筑物开裂、倒塌等一系列环境问题。本文采用现场测试法与理论分析法对盾构掘进区域内建筑物变形和受力进行了研究。本文主要创新工作如下:
     (1)现场测试方面主要包括:
     对杭州地铁1号线打铁关站—闸弄口站区间工程进行了现场实测,研究了盾构掘进对土体变形及邻近不同基础建筑物的影响,重点实测了盾构下穿短桩基础多层建筑物(第一汽车公司教练大队办公楼)的变形,以及邻近浅基础建筑物(文晖果品市场商铺)及长桩基础高层建筑物(野风现代家园住宅楼)盾构掘进引起的变形。
     (2)理论分析方面主要包括:
     1)土体变形方面:将盾构掘进引起的土体损失认为由开挖面出土平衡引起的土体损失和盾尾间隙及注浆产生的土体损失,推导了半无限空间三维土体变形计算公式,并给出了修正的Sagaseta地面纵向变形计算公式。
     2)纵向变形方面:利用修正的Sagaseta纵向地面变形计算公式,推导出盾构掘进区域浅基础(短桩基础)建筑物地基、基础和结构协同作用的力学模型及理论解。并利用盾构掘进区协同作用力学模型,研究了建筑物刚度、地基基床系数和盾构掘进过程中注浆率等施工参数变化对建筑物变形及内力的影响。
     3)横向变形方面:分析了邻近建筑物盾构掘进引起的土体横向的沉降分布规律,并给出了邻近建筑物工况下盾构隧道掘进引起的地表横向沉降预测公式:“塞形分布曲线”、“偏态分布曲线”和“正态分布曲线”预测公式。并编制了可视化软件“邻近建筑物隧道施工影响系统”,进而可以判断隧道掘进引起的地表横向沉降槽大小,以及其对邻近建筑物造成的损坏程度。
The shield method has been one of the main subway tunnel construction methods in domestic and foreign, however, shield construction may induce disturbance of soil within the construction influence scope and result in ground movements, excessive deformation will result in a series of environmental problems, such as the crack and collapse of the neighboring buildings. This thesis mainly adopts the method of field test and theoretical analysis to study the deformation and stress of the structure within the shield tunneling region. Main innovation work in this dissertation are listed as follows:
     (1) The main content in field test:
     Field test was adopted in the range of Datieguan Station-Zhanongkou Station engineering of Hangzhou metro line No1, this thesis studies the effects of shield tunneling on soil deformation and adjacent structure with different bases, especially the deformation of multistory building with shield tunneling below the short pile foundation(The First Car Company Coach Team office building), the deformation of adjacent building with shallow foundation (Wenhui Fruits Market Shops) and high building with long pile foundation(Yefeng Modern Home Resident Building)caused by shield tunneling.
     (2) The main content in theoretical analysis:
     1)Soil deformation:This thesis argues that the stratum loss caused by shield tunneling mainly includes which caused by the unearthed balance of excavation face, the gap of the shield tail and grouting. This thesis derives the formula of three-dimensional soil deformation in the semi-infinite space, and proposes the modified Sagaseta ground vertical deformation formula.
     2)Vertical deformation:Based on the modified Sagaseta ground vertical deformation formula, proposing the mechanical model and theoretical solution on the soil of shallow foundation building(short pile foundation)-foundation-structure interaction which located in the shield region. According to the shield region synergistic effect mechanical model, it is obtained the factors affects the deformation and internal force of structure, such as the structure stiffness, coefficient of subgrade reaction, the grouting ratio during tunneling, and so on.
     3)Horizontal deformation:This dissertation analyses on the laws of transverse subsidence of ground surface, and put forwarded the prediction formula of transverse subsidence of ground surface caused by shield tunnel construction adjacent buildings, such as:"plug-shaped curve","skewed distribution curve", and "normal distribution curve". Visualization software "The Effect System of Shield Tunnel Construction on Adjacent Structure" is compiled, and then it can judge the size of surface transverse sedimentation tank caused by tunnel excavation and the damage on adjacent structure.
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