鱼腹梁钢支撑体系的基坑变形控制研究与分析

李闯; 王瑞芳

doi:10.20265/j.cnki.issn.1007-2993.2023-0886

鱼腹梁钢支撑体系的基坑变形控制研究与分析

doi: 10.20265/j.cnki.issn.1007-2993.2023-0886

李闯,
王瑞芳

武汉科技大学城市建设学院，湖北武汉　430065

详细信息

作者简介:
李　闯，男，2000年生，在读硕士研究生，主要从事岩土工程研究。E-mail：2234780601@qq.com

中图分类号: TU473
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- 文章访问数: 6
- HTML全文浏览量: 5
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2023-11-26
- 修回日期: 2024-04-24
- 录用日期: 2024-05-09
- 刊出日期: 2025-02-21

Deformation control and analysis of pre-stressed fish-belly beem steel support system pit

School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, Hubei, China

摘要

摘要: 以武汉市某深基坑为例，分析预应力鱼腹梁钢支撑体系对基坑整体变形的控制效果，并在此基础上研究预应力、围护桩桩径和桩间距等因素对鱼腹梁钢支撑体系基坑变形的影响程度。研究表明：鱼腹梁钢支撑结构体系侧向变形、围护结构深层侧向位移以及坑外地表沉降均未超过基坑预警值，预应力的施加能够有效控制围护结构最大侧向位移，且在鱼腹梁位置处控制效果较好，基坑整体施工安全性大大提高；增大预应力、增大围护桩桩径、减小桩间距，均能在一定程度上减小基坑整体变形。在合理范围内，相较于围护桩桩间距，桩径的改变对鱼腹梁钢支撑体系最大侧向变形、围护结构深层最大侧向位移以及坑外地表最大沉降影响程度更大，对基坑整体变形影响效果更为显著。
- 预应力鱼腹梁钢支撑 /
- 深基坑工程 /
- 变形控制 /
- 参数分析
Abstract: Taking a deep foundation pit in Wuhan as an example, the control effectiveness of the pre-stressed fish-bellied beam steel support system on the overall deformation was analyzed. The influence of the degree of pre-stress, the pile diameter of the enclosing piles and the spacing of the piles on the deformation of the fish-belly beam steel support system was studied. The study shows that: the lateral deformation of the steel support structure system of the fish-belly beam, the deep lateral displacement of the enclosure structure and the ground settlement outside the pit do not exceed the warning value of the pit, and the application of pre-stress can effectively control the maximum lateral displacement of the enclosure structure, and the control effect is better at the position of the fish-belly beam, and the overall safety of the construction of the pit is greatly improved. Increasing the degree of pre-stress, the diameter of the enclosing piles, and reducing the pile spacing can reduce the overall deformation of the foundation pit to a certain extent. Within a reasonable range, compared with the spacing of the enclosing piles, the change of pile diameter has a greater influence on the maximum lateral deformation of the fish-belly beam steel support system, the maximum lateral displacement of the deep layer of the enclosing structure, and the maximum settlement of the ground surface outside the pit, which has a more significant effect on the overall deformation of the foundation pit.
- pre-stressed fish-belly beam steel support /
- deep foundation pit construction /
- deformation control /
- parametric analysis

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图 1 基坑周边环境布置简图

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图 2 基坑典型围护剖面图（单位：mm）

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图 3 预应力鱼腹梁组件示意图

1-下弦钢绞线；2-桥架；3-直腹杆；4-连杆；5-连接件；6-上弦梁；7-斜腹杆；8-锚具

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图 4 基坑支护模型

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图 5 基坑监测平面布置图（单位：mm）

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图 6 地表沉降图

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图 7 地表沉降云图

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图 8 南侧鱼腹梁处地表沉降曲线图

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图 9 围护桩深层侧向位移模拟值与实测值对比图

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图 10 钢支撑轴力模拟值与实测值对比图

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图 11 鱼腹梁钢支撑侧向位移云图

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图 12 整体未施加预应力时围护结构深层侧向位移云图

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图 13 整体施加预应力时围护结构深层侧向位移云图

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图 14 南侧鱼腹梁处围护结构深层侧向位移

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图 15 北侧鱼腹梁处围护结构深层侧向位移

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图 16 预应力施加程度与基坑变形关系图

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图 17 围护桩桩径与基坑变形关系图

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图 18 围护桩桩间距与基坑变形关系图

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图 19 围护桩参数与鱼腹梁钢支撑变形关系图

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表 1 地层主要物理力学参数

土层	平均厚度/m	重度 γ/(kN·m⁻³)	内摩擦角 φ/(°)	黏聚力 c/kPa	渗透系数 k/(cm·s⁻¹)
(1)素填土	1.47	17.0	18	8	1.0×10⁻⁴
(2-1)粉质黏土	3.70	19.3	10	19	2.0×10⁻⁵
(2a)粉质黏土	3.40	19.3	6.5	15	2.2×10⁻⁵
(3-1)粉质黏土	4.20	19.3	10	19	2.4×10⁻⁵
(3-2)粉质黏土	3.00	19.3	10.5	21	2.8×10⁻⁵
(4-1)粉砂夹粉黏	4.30	20.1	15	10	6.0×10-4
(4-2)粉砂	10.00	20.0	32	0	6.5×10-4

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表 2 支护构件参数

构件名称	截面尺寸 /mm	弹性模量 E/MPa	泊松比 v	重度 γ/(kN·m⁻³)
钢围檩	H400×400×13×21	206000	0.3	78.5
钢支撑	H350×350×12×19	206000	0.3	78.5
托梁	H300×300×10×15	206000	0.3	78.5
立柱	H350×350×12×19	206000	0.3	78.5

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表 3 预应力鱼腹梁系统参数及预应力设计值

鱼腹梁体系	钢绞线规格	预应力设计值/kN
北侧鱼腹梁	26ϕ^s15.2	3380
南侧鱼腹梁	22ϕ^s15.2	2860
西侧鱼腹梁	22ϕ^s15.2	2860
东侧鱼腹梁	14ϕ^s15.2	1820
角撑		1200
对撑		900

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