| 抗拔桩+抗浮板加固体系在上跨盾构隧道基坑开挖中的应用分析 |
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| 引用本文： | 文仁学.抗拔桩+抗浮板加固体系在上跨盾构隧道基坑开挖中的应用分析[J].路基工程,2021,0(4):188-193. |
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| 作者姓名： | 文仁学 |
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| 作者单位： | 中铁南方投资集团有限公司，广东深圳 518000 |
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| 摘 要： | 依托深圳市听海大道某地下基坑工程，通过三维数值模拟计算，研究了基坑采用高压旋喷桩加固软土地层方案、抗拔桩+抗浮板支护体系方案对超近接曲线隧道的变形控制效果及隧道转向造成的非对称力学演变规律。结果表明:抗拔桩+抗浮板支护体系对隧道及坑底上浮、水平位移的约束作用明显，竖向上浮量相比加固地层方案降低64.2 %；受地铁隧道转向及抗浮体系的非对称布置影响，抗浮板拉应力上升，隧道水平位移呈现左右连续摇摆平移的特征。
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| 关 键 词： | 基坑开挖 近接地铁 盾构隧道 抗浮体系 抗拔桩 抗浮板 |
| 收稿时间： | 2021-01-21 |
Application Analysis of Uplift Pile+Anti-floating Plate Reinforcement System in Foundation Pit Excavation of Upper Span Shield Tunnel |
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| Abstract: | Based on an underground foundation pit project in Tinghai Avenue, Shenzhen, through three-dimensional numerical simulation calculation, the scheme of high pressure jet grouting pile to reinforce the soft soil layer and the deformation control effect to ultra-close curve tunnel and the asymmetric mechanical evolution law caused by tunnel turning have been studied. The results show that the supporting system of uplift pile + anti-floating plate has obvious restraining effect on the floating and horizontal displacement of tunnel and pit bottom, and the vertical floating amount is reduced by 64.2 % compared with the scheme of strengthening stratum. Under the influence of subway tunnel steering and the asymmetric arrangement of anti-floating system, the tensile stress of anti-floating plate increases, and the horizontal displacement of the tunnel shows the character of continuous swing translation. |
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