| 邻近深基坑工程地铁结构位移现场监测与数值模拟分析 |
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| 引用本文： | 陈涛,张敏,耿司,潘小波,张成君.邻近深基坑工程地铁结构位移现场监测与数值模拟分析[J].路基工程,2018,0(6):205-210. |
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| 作者姓名： | 陈涛 张敏 耿司 潘小波 张成君 |
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| 作者单位： | 天津市勘察院, 天津 300191 |
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| 摘 要： | 以天津市某工程为背景，采用有限元分析方法，对地铁隧道管片和车站结构的位移进行计算，并与现场实测结果进行对比，以此来研究基坑开挖施工对地铁结构的影响。研究结果表明:基坑开挖过程中地铁结构产生了一定的水平和竖向位移，其中，隧道管片的位移大于车站主体结构的位移；数值模拟结果与现场实测数据变化趋势基本一致，数值比较接近，二期基坑顶板施工完毕时，隧道管片水平位移最大实测值和模拟值分别为-3.91，-4.97 mm，竖向位移分别为-3.02，-3.41 mm，模拟结果与实测数据均在变形控制标准之内；基坑开挖过程中，隧道管片水平和竖向位移均呈现出两端小、中间大的抛物线变化趋势，最大值出现在邻近基坑开挖侧隧道管片位移监测区段的中点处。
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| 关 键 词： | 深基坑 地铁结构 位移 监测 数值模拟分析 |
| 收稿时间： | 2019-11-09 |
Field Monitoring and Numerical Simulation on Displacement of Metro Structures Adjacent to Deep Foundation Pit Engineering |
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| Abstract: | In relation to the works in Tianjin, finite element analysis was used to calculate the displacement of the metro tunnel segment and station structure, and then by comparing with the measured result, the effect of deep excavation on metro structures was studied. The result shows that, in the course of deep excavation, the metro structures may have certain horizontal and vertical displacement, wherein the tunnel segment has larger displacement than the main structure of station; the result of numerical simulation has basically the same variation trend as the measured data with their numerical values close to each other, for example, at the end of the roof construction in the phase Ⅱ excavation, the tunnel segment has the horizontal displacement values of -3.91 mm(measured, max.) and-4.97 mm(simulated), and the vertical displacement values of-3.02 mm(measured) and-3.41 mm(simulated), respectively, both the simulation result and the measured data are under control of the deformation criterion; in the course of deep excavation, both the horizontal and vertical displacement of tunnel segment present a parabolic trend, i.e. small at two ends and big in the middle, with the maximum value occurring at the midpoint in the displacement monitoring section for the tunnel segment on the side of adjacent foundation pit. |
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