强蠕变软土条件下地铁基坑的施工变形特性分析

上海交通大学学报（自然版） ›› 2013, Vol. 47 ›› Issue (09): 1413-1418.

强蠕变软土条件下地铁基坑的施工变形特性分析

周坤鹏1a，王颖轶1b，朱继文2，黄醒春1a,1b

（1a.上海交通大学船舶海洋与建筑工程学院，上海 200240； 1b.上海交通大学海洋水下工程科学研究院，上海 200231； 2.上海城建市政工程(集团)有限公司, 上海 200092）

收稿日期:2013-01-03 出版日期:2013-09-28 发布日期:2013-09-28

Analysis of Deformation Properties of Subway Station Foundation Pit in Soft Soil with High Creep Property

ZHOU Kunpeng1a,WANG Yingyi1b,ZHU Jiwen2,HUANG Xingchun1a,1b

(1a.School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 1b.Chinese Underwater Technology Institute, Shanghai Jiaotong University, Shanghai 200231, China; 2.Shanghai Urban Construction Municipal Engineering (Group) Co. Ltd., Shanghai 200092, China)

Received:2013-01-03 Online:2013-09-28 Published:2013-09-28

摘要/Abstract

摘要：

以宁波市地铁1号线东环南路站基坑工程为研究对象，分析了基坑工程围护结构变形和外围地表沉降的变化规律.结果表明，基坑开挖对围护结构变形及外围土体沉降的影响具有明显的时间效应，施工过程中应严格控制深层土体的开挖时间，并需要及时架设支撑及浇注混凝土底板.同时，结合有限元数值计算和位移转化系数的方法推算了考虑软土强蠕变性的基坑变形长时位移，所得结果与其监测结果相吻合，从而验证了所采用的监测方法的可行性.

关键词: 软土, 基坑工程, 强蠕变性, 有限元建模, 长时位移

Abstract:

In order to investigate the effect of soft soil with strong creep resistance on the deformation during construction, based on the foundation pit engineering of the South East Outer Ring Road Station in Ningbo, the deformation of the building envelope and the external surface subsidence were analyzed. The results show that the effect of the foundation excavation on the deformation of the building envelope and the external surface subsidence has an obvious time effect. So the time of deeper soil excavation should be strictly controlled followed by timely erection of support and pouring of concrete floor. Meanwhile, the deformation and longterm displacement of the pit were calculated by combining the finite element modeling (FEM) with the displacement aging coefficient and taking the strong creep resistance into account. The numerical results conform to the monitored results,
which verifies the feasibility of the method, and provides reference for similar excavation engineering.

Key words: soft soil, excavation engineering, high creep property, finite element modeling (FEM) simulation, long-term displacement

中图分类号:

TU 447

周坤鹏1a，王颖轶1b，朱继文2，黄醒春1a,1b. 强蠕变软土条件下地铁基坑的施工变形特性分析[J]. 上海交通大学学报（自然版）, 2013, 47(09): 1413-1418.

ZHOU Kunpeng1a,WANG Yingyi1b,ZHU Jiwen2,HUANG Xingchun1a,1b. Analysis of Deformation Properties of Subway Station Foundation Pit in Soft Soil with High Creep Property[J]. Journal of Shanghai Jiaotong University, 2013, 47(09): 1413-1418.

参考文献

［1］刘建航. 基坑工程时空效应理论与实践［R］. 上海市科委课题报告, 1997.

［2］刘涛, 杨国伟, 刘国彬. 上海软土深基坑有支撑暴露变形研究［J］. 岩土工程学报, 2006, 28 (S1): 18421845.

LIU Tao, YANG Guowei, LIU Guobin. Researches on bracing displacement of deep pits in Shanghai soft soil region ［J］. Chinese Journal of Geotechnical Engineering, 2006, 28 (S1): 18421845.

［3］刘国彬, 刘登攀, 刘丽雯, 等. 基坑坑底施工阶段围护墙变形监测分析［J］. 岩石力学与工程学报, 2007, 26 (S2): 43864394.

LIU Guobin, LIU Dengpan, LIU Liwen, et al. Monitoring and analysis of lateral deformation of retaining wall during bottom excavation in deep pit ［J］. Chinese Journal of Rock Mechanics and Engineering, 2007, 26 (S2): 43864394.

［4］郭海柱, 张庆贺, 朱继文, 等. 土体耦合蠕变模型在基坑数值模拟开挖中的应用［J］. 岩土力学, 2009, 30 (3): 688692.

GUO Haizhu, ZHANG Qinghe, ZHU Jiwen, et al. Application of soil coupled creep model to simulate foundation pit excavation ［J］. Rock and Soil Mechanics, 2009, 30 (3): 688692.

［5］孙凯, 许振刚, 刘庭金, 等. 深基坑的施工监测及其数值模拟分析［J］. 岩石力学与工程学报, 2004, 23 (2): 293298.

SUN Kai, XU Zhengang, LIU Tingjin, et al. Construction monitoring and numerical simulation foundation of a analysis pit ［J］. Chinese Journal of Rock Mechanics and Engineering, 2004, 23 (2): 293298.

［6］任建喜, 高立新, 刘杰, 等. 深基坑变形规律现场监测［J］. 西安科技大学学报, 2008, 28 (3): 445449.

REN Jianxi, GAO Lixin, LIU Jie, et al. Insitu monitoring on deformation laws of deep foundation pit ［J］. Journal of Xi’an University of Science and Technology, 2008, 28 (3): 445449.

［7］王増勇. 深基坑地下连续墙开挖施工监测［J］. 技术与市场, 2011, 18 (4): 4445.

WANG Zengyong. Excavation monitoring of diaphragm wall in deep foundation pit ［J］. Technology and Market, 2011, 18 (4): 4445.

[1]	唐建辉，李平，王新浪，金奕潼. 管夯深层加固方法的软基现场工艺试验[J]. 上海交通大学学报, 2019, 53(7): 812-818.
[2]	张硕，叶冠林，甄亮，李明广，陈超斌. 考虑小应变下刚度衰减特征的软土本构模型[J]. 上海交通大学学报, 2019, 53(5): 535-539.
[3]	赵香山, 陈锦剑, 黄忠辉, 王建华. 基坑变形数值分析中土体力学参数的确定方法[J]. 上海交通大学学报, 2016, 50(01): 1-7.
[4]	赖华辉1a，朱继文2，王颖轶1b,黄醒春1a,1b. 考虑流变特性的软土长时位移分析方法及其应用[J]. 上海交通大学学报（自然版）, 2013, 47(09): 1419-1423.
[5]	吴怀娜1, 许烨霜1, 沈水龙1, 刘艳滨2. 软土地区基坑降水对下方越江隧道的影响[J]. 上海交通大学学报（自然版）, 2012, 46(01): 53-57.
[6]	丁春勇, 王建华, 徐中华, 陈锦剑. 上海软土地区地铁车站深基坑的变形特性[J]. 上海交通大学学报, 2008, 42(11): 1871-1875.
[7]	陈锦剑, 王建华, 朱峰. 软土地区单桩沉降的简化计算方法[J]. 上海交通大学学报, 2006, 40(12): 2126-2129.