压入式沉井与反力桩对地表沉降的耦合影响研究

张中杰; 王啸翔; 俞剑; 黄茂松; 王浩然

doi:10.11779/CJGE2024S20039

压入式沉井与反力桩对地表沉降的耦合影响研究 English Version

张中杰^1,,
王啸翔^{2, 3},
俞剑^{2, 3, ,},
黄茂松^{2, 3},
王浩然¹

1.
上海市城市建设设计研究总院(集团)有限公司, 上海 200125
2.
同济大学土木工程学院地下建筑与工程系, 上海 200092
3.
同济大学岩土及地下工程教育部重点实验室, 上海 200092

基金项目:

上海市自然科学基金项目 23ZR1468500

详细信息

作者简介:
张中杰(1976—)，男，正高级工程师，主要从事岩土工程方面的设计和研究工作。E-mail: vincentsucdri@126.com

通讯作者:
俞剑, E-mail: 002yujian@tongji.edu.cn

中图分类号: TU43
计量
- 文章访问数: 72
- HTML全文浏览量: 6
- PDF下载量: 17
出版历程
- 收稿日期: 2021-06-21
- 刊出日期: 2024-09-30

Coupling effects of pressed caisson and uplift piles on surface settlement

ZHANG Zhongjie^1,,
WANG Xiaoxiang^{2, 3},
YU Jian^{2, 3, ,},
HUANG Maosong^{2, 3},
WANG Haoran¹

1.
Shanghai Urban Construction Design & Research Institute (Group) Co., Ltd., Shanghai 200125, China
2.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
3.
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

摘要

摘要: 利用压入式连续沉井群建造轨交地下车站是一种新型预制装配建造模式，但相较传统的明挖式基坑车站修建方式，目前尚缺乏对沉井压入过程环境影响的研究。为此，本研究以实际工程案例为背景，通过数值模拟，结合现有实测拟合沉降曲线，对比调查了沉井外侧反力桩的存在与否对地表沉降剖面的影响规律；进一步调查了桩间距对于地表沉降的调控作用；并基于抗拔承载力等效原则，同时探究了桩间距和桩径对周边土体沉降的影响。进而形成了桩外侧和桩间土体沉降剖面的修正归一化曲线，为压入式连续沉井群地下车站在高密度城市中心的实施提供参考支撑。
- 压入式沉井 /
- 地表沉降 /
- 反力桩 /
- 数值模拟
Abstract: Constructing underground railway stations using the pressed continuous caisson group is a new type of prefabricated assembly construction mode. However, compared to the traditional open-pit excavation method of station construction, there is currently a lack of research on the environmental impact of the caisson pushing process. Therefore, taking the actual projects as a background, this study conducted numerical simulations and combined existing measured data to fit subsidence profile curves. The influences of the presence or absence of the reactive piles outside the caissons on the surface settlement profile are investigated. Further investigations are done on the regulation effects of pile spacing on the surface settlement. Based on the principle of the equivalent anti-pulling bearing capacity, the influences of pile spacing and pile diameter on the settlement of the surrounding soil are also explored. Consequently, a modified normalization curve for the settlement profile of the soil outside and between piles is formed, and it may provide reference support for the implementation of the underground stations with pressed continuous caisson group in densely populated urban centers.
- pressed caisson /
- surface settlement /
- uplift pile /
- numerical simulation

HTML全文

图 1 连续沉井车站总平面图

Figure 1. General layout of station with continuous caissons

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图 2 压入式沉井示意图

Figure 2. Schematic diagram of pressed caisson

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图 3 地表沉降结果及剖面示意图（无反力桩）

Figure 3. Contours of surface settlement and cross-section

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图 4 沉井贯入地表沉降剖面

Figure 4. Profile of surface settlement due to penetration of caissons

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图 5 地表沉降结果云图（工况1）

Figure 5. Contours of surface settlement

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图 6 工况1（实际工况）地表沉降剖面

Figure 6. Profiles of surface settlement for actual working condition

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图 7 桩间距对地表沉降剖面的影响

Figure 7. Profiles of surface settlement under different pile distances

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图 8 不同反力桩尺寸对应的地表沉降曲线

Figure 8. Profiles of surface settlement under different pile sizes

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图 9 桩间距对桩间土沉降的影响

Figure 9. Effects of pile spacing on surface settlement

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图 10 桩间距与桩径对桩侧土体沉降的耦合影响

Figure 10. Coupled effects of pile spacing and pile diameter on surface settlement

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表 1 数值模拟工况介绍

Table 1 Case studies for numerical simulation

工况	桩径D/m	桩间距s/m	桩数	评述
0	—	—	—	无反力桩
1	1	3.5	10	实际工况
2	1	2.3	14	桩间距影响
3	1	1.2	20	桩间距影响
4	0.5	1.7	20	与工况1抗拔等效
5	0.25	0.85	40	与工况1抗拔等效

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表 2 沉井、反力桩材料参数

Table 2 Material parameters of caissons and uplift piles

结构物	弹性模量/GPa	泊松比
沉井、反力桩	30	0.3

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表 3 第④层灰色淤泥质黏土材料参数

Table 3 Material parameters of gray silty clay of Layer 4

材料参数	数值
重度/(kN·m^-3)	16.4
弹性模量/kPa	69502
不排水抗剪强度/kPa	27
泊松比	0.49
初始屈服应力A	2.7
运动硬化参数C1	16712
Gamma1	325

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参考文献(5)

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