考虑时空效应的杭州软黏土超深基坑地表沉降分析方法

doi:10.16183/j.cnki.jsjtu.2023.199

上海交通大学学报 ›› 2025, Vol. 59 ›› Issue (1): 48-59.doi: 10.16183/j.cnki.jsjtu.2023.199

考虑时空效应的杭州软黏土超深基坑地表沉降分析方法

熊一帆¹, 应宏伟¹^,²(), 张金红³, 程康⁴, 李冰河³

1.河海大学岩土力学与堤坝工程教育部重点实验室,南京 210098
2.浙江大学滨海和城市岩土工程研究中心,杭州 310058
3.浙江省建筑设计研究院,杭州 310006
4.中铁十一局集团有限公司,武汉 430061

收稿日期:2023-05-18 修回日期:2023-08-24 接受日期:2024-05-21 出版日期:2025-01-28 发布日期:2025-02-06
通讯作者: 应宏伟,教授,博士生导师;E-mail:ice898@zju.edu.cn.
作者简介:熊一帆(1999—),硕士生,从事地下工程方面的研究.
基金资助:
国家自然科学基金(51678523);浙江省建设科研项目(2018K119);中央高校基本科研业务费资助项目(B200201012)

Analysis Method for Ground Settlement Induced by Ultra-Deep Excavation in Hangzhou Soft Clay Considering Time-Space Effect

XIONG Yifan¹, YING Hongwei¹^,²(), ZHANG Jinhong³, CHENG Kang⁴, LI Binghe³

1. Key Laboratory of the Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
3. Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310006, China
4. China Railway 11th Bureau Group Co., Ltd., Wuhan 430061, China

Received:2023-05-18 Revised:2023-08-24 Accepted:2024-05-21 Online:2025-01-28 Published:2025-02-06

摘要/Abstract

摘要：

利用PLAXIS 3D软件和软土蠕变模型,建立杭州中心项目超深基坑群B2基坑的三维数值模型,深入分析了时空因素对坑外地表沉降的影响.引入互补误差函数和三折线模型,利用数值结果对既有互补误差函数进行修正,提出了考虑时空效应的地表沉降快速分析方法.结果表明:软黏土蠕变既诱发围护墙的附加侧移从而引起土体沉降,又诱发坑外土体产生不依赖于围护墙侧移的沉降;忽略软土蠕变对预测超深基坑坑外地表沉降的影响不弱于其对墙体侧移的影响;基坑深度和开挖速率相同时,开挖面积直接决定施工时间的长短,从而影响软黏土蠕变诱发的地表沉降.

关键词: 软黏土, 超深基坑, 地表沉降, 时空效应, 互补误差函数

Abstract:

The PLAXIS 3D software and the soft soil creep model were used to establish a 3D numerical model of the B2 excavation within an ultra-deep excavation group, allowing for analysis of the effects of time-space factors on ground settlements. Then, the complementary error function and trilinear model were introduced. After that, the numerical results were used to correct the complementary error function. Finally, a rapid approach was proposed for predicting ground settlements while accounting for the temporal and spatial influences. The results indicate that soft soil creep not only causes additional wall deflections resulting in soil settlements but also induces soil settlements independent of these deflections. The impact of ignoring soft soil creep on prediction of ground settlement is not weaker than that of wall deflections. The excavation area determines the construction duration when the excavation depth and rate are identical, impacting ground settlements induced by soft soil creep.

Key words: soft clay, ultra-deep excavation, ground settlement, time-space effect, complementary error function

中图分类号:

TU478

熊一帆, 应宏伟, 张金红, 程康, 李冰河. 考虑时空效应的杭州软黏土超深基坑地表沉降分析方法[J]. 上海交通大学学报, 2025, 59(1): 48-59.

XIONG Yifan, YING Hongwei, ZHANG Jinhong, CHENG Kang, LI Binghe. Analysis Method for Ground Settlement Induced by Ultra-Deep Excavation in Hangzhou Soft Clay Considering Time-Space Effect[J]. Journal of Shanghai Jiao Tong University, 2025, 59(1): 48-59.

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工况	施工内容	时长/d
1	开挖至-8.3 m,第2道支撑形成强度	30
2	开挖至-13.8 m,第3道支撑形成强度	37
3	开挖至-17.9 m,第4道支撑形成强度	43
4	开挖至-22.1 m,第5道支撑形成强度	32
5	开挖至-26.3 m,第6道支撑形成强度	31
6	开挖至-30.2 m,底板形成强度	57

本构模型	土层	l/m	γ/(kN·m^-3)	c'/kPa	φ'/(°)	λ^*	κ^*	μ^*
SSC	②软黏土	20.4	17.8	5	25	0.06	0.006	0.002 5
						$E 50 r e f$ /MPa	$E o e d r e f$ /MPa	$E u r r e f$ /MPa	$G 0 r e f$ /MPa	γ_0.7	m
HS-Small	①填土	6.5	17.0	5	28	4.5	3.8	22.7	79.4	0.000 2	0.80
	③粉质黏土	13.5	19.3	25	30	6.5	5.4	32.4	113.4	0.000 2	0.80
	加固土	23.7	19.3	60	25	15.0	15.0	85.0	170.0	0.002 0	0.12
						E/MPa	υ
MC	④圆砾	2.2	19.0	1	18	36	0.30
	⑤强风化砂岩	6.9	21.0	30	20	90	0.25
	⑥中风化砂岩	20.5	22.0	50	30	3 600	0.25

考虑时空效应的杭州软黏土超深基坑地表沉降分析方法

Analysis Method for Ground Settlement Induced by Ultra-Deep Excavation in Hangzhou Soft Clay Considering Time-Space Effect

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