浅埋隧道施工对邻近桩基的影响与加固措施

张江涛; 蒲振华; 张玉栋; 李权超; 江杰; 危登涛

doi:10.20265/j.cnki.issn.1007-2993.2023-0794

浅埋隧道施工对邻近桩基的影响与加固措施

doi: 10.20265/j.cnki.issn.1007-2993.2023-0794

1.
中铁隧道局集团建设有限公司，广西南宁　530003
2.
广西大学土木建筑工程学院，广西南宁　530004

基金项目: 国家自然科学基金资助项目（52068004）；广西科技计划（桂科AC20238002）

详细信息

作者简介:
张江涛，男，1982年生，大学本科，工程师，主要从事公路工程、隧道工程、市政工程方面工作与研究。E-mail：156587148@qq.com

通讯作者:
江　杰，男，1979年生，博士，教授，主要从事桩基理论与基坑支护方面的研究工作。E-mail：jie_jiang001@126.com

中图分类号: TU452
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- 文章访问数: 5
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- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-19
- 修回日期: 2024-01-31
- 录用日期: 2024-08-29
- 刊出日期: 2025-02-21

Influence of shallow tunnel construction on adjacent pile foundation and reinforcement measures

1.
China Railway Tunnel Bureau Group Construction Co., Ltd., Nanning 530003, Guangxi, China
2.
School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China

摘要

摘要: 为了研究浅埋隧道施工对邻近桩基的影响与加固措施，依托芦澳路下穿马青路工程建立了有限元模型。分析了浅埋隧道开挖引起的地表沉降以及桩基的变形和内力，发现桩基的最大水平位移（3.63 mm）超过了变形控制指标（3 mm），并对邻近桩基的内力产生了较大影响；在此基础上提出了注浆加固的保护措施，并对比分析不同加固深度的保护效果。研究结果表明：对桩基周围土体进行注浆加固，可显著降低桩基的变形和内力，当注浆加固深度为15 m时，可取得较佳的效果；通过与现场监测数据对比，验证了模型的可靠性与加固措施的合理性。
- 浅埋隧道 /
- 邻近桩基础 /
- 加固措施 /
- 数值模拟
Abstract: To study the influence of the shallow tunnel construction on the adjacent pile foundation and the reinforcement measures, this research relies on the Lu’ao Road underpassing Maqing Road project to establish a finite element model. The surface settlement caused by shallow tunnel excavation and the deformation and internal force distribution law of the pile foundation were analyzed. It was found that the maximum horizontal displacement of the pile foundation (3.63 mm) exceeded the deformation control index (3 mm) and had a large impact on the internal force of the adjacent pile foundation. The protective measures of grouting reinforcement were proposed, and the protective effects of different reinforcement depths were compared and analyzed. The results show that grouting reinforcement of the soil around the pile foundation can significantly reduce the deformation and internal force of the pile foundation, and better results can be achieved when the depth of grouting reinforcement is 15 m. The reliability of the model and the rationality of reinforcement measures are verified by comparing them with the field monitoring data.
- shallow tunnel /
- adjacent pile /
- reinforcement measure /
- numerical simulation

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图 1 YK1+94断面示意图

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图 2 计算模型示意图

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图 3 地表沉降曲线

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图 4 右线、左线隧道开挖完成后桩的位移

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图 5 右线、左线隧道开挖完成后桩的内力

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图 6 注浆加固示意图

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图 7 不同加固深度桩1的位移

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图 8 不同加固深度下桩1的位移加固率

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图 9 不同加固深度下桩1的内力

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图 10 不同加固深度下桩1的内力加固率

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图 11 地表沉降计算值与监测值对比

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图 12 桩的历时沉降曲线

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表 1 各项目控制标准和警戒值 mm　　

项目	控制值	警戒值
地表沉降	30	24
桩基沉降	15	12
桩基水平位移	3	2.4
相邻桩基差异沉降	5	4

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表 2 土层参数

土层	H/m	Γ/(kN·m⁻³)	$ \varphi $/(°)	c/kPa	$ \mathrm{\nu } $	E/(kN·m⁻²)
素填土	3	19.3	16	20	0.3	8×10³
粉质黏土	9	20	13.5	26.4	0.3	20×10³
残积砂质黏性土	5	18.2	26	50	0.25	25×10³
全风化花岗岩	8	19.5	22	18	0.3	60×10³
中等风化花岗岩	18	26	49	32.9	0.25	150×10³
注浆加固区		22	30	70	0.29	300×10³
超前小导加固区		25	32	500	0.25	1.5×10⁶

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表 3 承台、初期支护相关参数

参数	承台	初期支护
单元类型	板	板
EA/(kN/m)	30×10⁶	11.4×10⁶
EI/(kN·m²/m)	2.5×10⁶	85.5×10³
W/(kN/m/m)	24	6
$ \mathrm{\nu } $	0.2	0.2
d/m	1.0	0.3

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表 4 桩相关参数

参数	桩
单元类型	embedded桩
材料类型	线弹性
预定义梁类型	圆弧梁
E/ (kN·m⁻²)	30×10⁶
Γ/(kN·m⁻³)	7
d/m	1.2

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