考虑地层损失的隔离桩对基坑旁侧盾构隧道变形保护研究

魏纲; 木志远; 齐永洁; 郭丙来; 项鹏飞

doi:10.11779/CJGE20221403

考虑地层损失的隔离桩对基坑旁侧盾构隧道变形保护研究 English Version

魏纲^{1, 2,},
木志远³,
齐永洁^4, ,,
郭丙来⁵,
项鹏飞⁶

1.
浙大城市学院浙江省城市盾构隧道安全建造与智能养护重点实验室, 浙江杭州 310015
2.
浙大城市学院城市基础设施智能化浙江省工程研究中心, 浙江杭州 310015
3.
安徽理工大学土木建筑学院, 安徽淮南 232001
4.
浙江大学滨海和城市岩土工程研究中心, 浙江杭州 310058
5.
浙江工业大学岩土工程研究所, 浙江杭州 310014
6.
浙江同济科技职业学院建筑工程学院, 浙江杭州 311200

基金项目:

浙江省基础公益研究计划项目 LGF22E080012

详细信息

作者简介:
魏纲(1977—)，男，教授，博士生导师，从事地下隧道与周边环境相互影响及风险评估与控制等方面的研究。E-mail：weig@hzcu.edu.cn

通讯作者:
齐永洁, E-mail：qyjdaydayup@zju.edu.cn

中图分类号: TU43
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- 文章访问数: 410
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- PDF下载量: 133
出版历程
- 收稿日期: 2022-11-13
- 网络出版日期: 2024-03-14
- 刊出日期: 2024-02-29

Deformation protection of shield tunnels next to foundation pits by isolation piles considering formation loss

1.
Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou City University, Hangzhou 310015, China
2.
Zhejiang Engineering Research Center of Intelligent Urban Infrastructure, Hangzhou City University, Hangzhou 310015, China
3.
School of Civil Engineering and Architecture, Anhui University of Science & Technology, Huainan 232001, China
4.
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
5.
Institute of Geotechnical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
6.
Department of Architectural Engineering, Zhejiang Tongji Vocational College of Science and Technology, Hangzhou 311200, China

摘要

摘要: 基坑的开挖卸载会导致旁侧既有盾构隧道出现变形破坏，工程中常在基坑与隧道之间设置隔离桩来保护既有隧道。为研究基坑开挖影响下隔离桩外既有隧道的水平位移规律，建立基坑、隔离桩、既有隧道的三维力学计算模型，考虑基坑开挖引起的地层损失，推导了基坑卸荷引起的附加应力计算公式，基于Kerr地基模型并对地基系数做出调整，得到隔离桩挠曲变形计算公式，建立隔离桩挠曲变形影响区，根据影响区的地层损失推导了既有隧道水平位移计算公式，同时进行了案例验证与影响因素分析，对隔离桩的“牵引作用”与“保护作用”在理论上做出了解释。研究结果表明：计算结果与工程实测数据及数值模拟结果相互吻合；设置隔离桩能够有效降低隧道水平位移，起到很好的保护作用；保护作用随着隔离桩桩长的增加而逐渐增加；桩长达到临界点后，隔离桩“牵引作用”产生，保护作用随桩长增加而减小；桩间距较小时保护效果较好；隔离桩设置靠近基坑一侧时保护效果明显优于设置在靠近隧道一侧。
- 地层损失 /
- 盾构隧道 /
- 基坑开挖 /
- 隔离桩 /
- Kerr地基模型
Abstract: The excavation and unloading of a foundation pit will lead to the deformation and destruction of the adjacent tunnels. In engineering, the isolation piles are often set between the foundation pit and the tunnel to protect the tunnel. In order to study the horizontal displacement laws of the existing tunnels outside the isolation piles under the influences of excavation of foundation pits, a three-dimensional mechanical model is established. Considering the stratum loss caused by excavation of foundation pits, the formula for the additional stress caused by unloading of the foundation pits is derived. Based on the Kerr foundation model and the adjustment of the foundation coefficient, the formula for the deflection deformation of the isolation piles is obtained. Based on the formation loss in the affected area, the formula for calculating the horizontal displacement of the existing tunnels is deduced. At the same time, the case is verified and the influencing factors are analyzed. The "traction effects" and "protection effects" of the isolation piles are explained theoretically. The results show that the calculated results are consistent with the measured data and numerical results. Setting isolation piles can effectively reduce the horizontal displacement of the tunnels and play a good protective role. The protective effects of the short piles gradually increase with the increase of the length of the isolated piles. After the pile length reaches the critical point, the "traction effects" of the isolation piles occur, and the protective effects decrease with the increase of the pile length. The protection effects are better when the pile spacing is small. When the isolation piles are placed close to the side of the foundation pit, the protection effects are significantly better than those of the side close to the tunnels.
- stratigraphic loss /
- shield tunnel /
- excavation of foundation pit /
- isolation pile /
- Kerr foundation model

HTML全文

图 1 力学模型平面图

Figure 1. Plan of mechanical model

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图 2 力学模型侧面图

Figure 2. Lateral view of mechanical model

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图 3 围护结构变形计算模型

Figure 3. Model for envelope deformation

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图 4 地层位移变形计算模型

Figure 4. Model for displacement deformation of formation

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图 5 桩土相互作用计算模型

Figure 5. Model for pile-soil interaction

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图 6 隔离桩变形示意图

Figure 6. Schematic diagram of deformation isolation piles

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图 7 基坑-隔离桩-隧道三者位移变形示意图

Figure 7. Schematic diagram of displacement deformation of foundation pit-isolation pile-tunnel

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图 8 紧密隔离桩与非紧密隔离桩的对比

Figure 8. Comparison between tight piles and non-tight isolation piles

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图 9 隔离桩挠曲变形形成的空隙区域示意图

Figure 9. Schematic diagram of void area formed by deflection deformation of isolation piles

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图 10 工程案例1隧道水平位移对比

Figure 10. Comparison of horizontal displacements of tunnels with different spacings in project case 1

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图 11 工程案例2隧道水平位移对比

Figure 11. Comparison of horizontal displacements of tunnels in project case 2

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图 12 工程案例3隧道水平位移对比

Figure 12. Comparison of horizontal displacements of tunnels in project case 3

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图 13 不同桩长隔离桩影响下的水平位移

Figure 13. Horizontal displacements of isolation piles under influences of different pile lengths

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图 14 桩间距影响下隧道的水平位移

Figure 14. Horizontal displacements of tunnels under influences of pile spacing

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图 15 设置不同位置桩时隧道水平位移分布曲线

Figure 15. Distribution curves of horizontal displacement of tunnels under different positions of piles

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