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| 地铁车站深基坑开挖全过程的三维数值模拟分析 |
| Three‑dimensional Numerical Simulation Analysis of the Whole Process of Excavation of Deep Foundation Pits in Metro Stations |
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| DOI：10.16018/j.cnki.cn32-1650/n.202303006 |
| 中文关键词: 基坑开挖 数值模拟 支护结构内力 基坑变形 |
| 英文关键词: foundation pit excavation numerical simulation retaining structure internal force foundation pit deformation |
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| 中文摘要: |
| 为研究地铁车站基坑围护结构的力学性状及周边土体变形情况，运用ABAQUS软件建立地铁深基坑开挖全过程的三维数值模型，在充分考虑材料非线性的基础上，结合特定断面分析基坑开挖全过程中支护结构和基坑的变形情况。结果表明: 坑底竖向位移与开挖深度呈正相关，整体表现为“鼓肚子”的变形形式；随着开挖深度的增加，支护结构侧向位移先增大后减小，最大位移出现在墙体顶部以下0. 7H~0. 8H处，且端头井处侧向位移明显小于标准段；基坑开挖导致地连墙周边10 m范围内出现明显的地面倾斜，会对既有建筑物造成不利影响，距离基坑边缘30 m以外的地面倾斜则不会对地面建筑造成明显影响。 |
| 英文摘要: |
| In order to study the mechanical properties of the retaining structure of the foundation pit of the subway station and the deformation of the surrounding soil, the three-dimensional numerical model of the whole process of the excavation of the deep foundation pit of the subway is established by using ABAQUS software. On the basis of fully considering the nonlinearity of materials, the deformation of supporting structure and foundation pit in the whole process of foundation pit excavation is analyzed in combination with specific sections. The results show that the vertical displacement of the bottom of the pit is positively correlated with the excavation depth, and the overall performance is the deformation form of "drum belly"; with the increase of excavation depth, the lateral displacement of the supporting structure increases first and then decreases. The maximum displacement appears at 0. 7H ~ 0. 8H below the top of the wall, and the lateral displacement at the end well is significantly smaller than that of the standard section. The excavation of the foundation pit leads to obvious ground tilt within 10 m around the diaphragm wall, which will adversely affect the existing buildings. The ground tilt beyond 30 m from the edge of the foundation pit will not have a significant impact on the ground buildings. |
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