气压沉箱施工对周边地层环境影响的现场监测与数值模拟

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摘要现代气压沉箱工法以自动化挖排土、地面遥控操作区别于传统气压沉箱工法，在大深度、近距离地下工程建设中有着广泛的应用前景。针对气压沉箱特殊的施工工艺及流程，从现场监测和数值模拟，对上海某气压沉箱竖井施工对周边地层变形的影响进行研究。根据气压沉箱分节下沉特点，对其下沉过程进行力学分析，在仅考虑沉箱竖向受力平衡的前提下，提出用于分析施工全过程的周边地层变形力学模型，并介绍其有限元数值模拟的实现方法。土体采用Hardening-Soil弹塑性模型，可以模拟土体初次加载–卸载–再加载之间的刚度差异。通过对气压沉箱工程实例施工全过程的有限元数值模拟，结合现场监测数据，给出气压沉箱周边土体地面沉降和深层水平位移的分布形式及地表影响范围，同时也证实该力学模型及所采用土体参数的合理性和有效性。最后提出一个适合上海软土地区气压沉箱施工周边地表沉降计算模式，并与其他支撑开挖引起的地表沉降特征进行比较分析。

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	王海林1
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	彭芳乐1
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	徐正良3
	李耀良4
	白廷辉5

关键词 ：土力学, 现代气压沉箱, 隧道竖井, 地层变形, 现场监测, 数值模拟

Abstract：Characterized by unmanned excavation and remote controlling，the new pneumatic caisson(NPC) method has advantages in deep excavation such as deep shield tunnel shafts and some underground construction close to the existing structures or facilities. When adopted in urban areas，it is very important to control the ground deformation during a caisson construction. For this purpose，based on a shaft construction employing the NPC method in Shanghai，field measurement of ground deformation was conducted. Based on the particular construction sequence of pneumatic caisson，a kinematic mechanical model was proposed for evaluating the influence of NPC construction on the surrounding strata. This model was imbedded into a finite element method(FEM) program. In the numerical analysis，the soil was assumed as an elastoplastic material；and the Hardening-Soil(H-S) material model was applied. By comparing the FE predicted results using the proposed model and the field measurement，the accuracy and reliability of this model were verified；and the distribution pattern of soil movements induced by NPC construction was analyzed. It is found that its influence zone on the surface is about 1.5 times sinking depth of caisson. Finally，a ground surface settlement calculation mode during NPC construction in Shanghai soft ground is proposed and compared with that caused by other braced excavation methods.

Key words： soil mechanics new pneumatic caisson(NPC) tunnel shaft ground deformation field measurement numerical simulation

引用本文:

王海林1，2，彭芳乐1，2，徐正良3，李耀良4，白廷辉5. 气压沉箱施工对周边地层环境影响的现场监测与数值模拟[J]. 岩石力学与工程学报, 2010, 29(S2): 3941-3951.
WANG Hailin1，2，PENG Fangle1，2，XU Zhengliang3，LI Yaoliang4，BAI Tinghui5. FIELD MEASUREMENT AND NUMERICAL SIMULATION OF GROUND DEFORMATION INDUCED BY PNEUMATIC CAISSON CONSTRUCTION. , 2010, 29(S2): 3941-3951.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/IS2/3941

[1] KODAKI K，NAKANO M，MAEDA S. Development of the automatic system for pneumatic caisson[J]. Automation in Construction，1997，6(3)：241–255.

[2] 彭芳乐，孙德新，大内正敏，等. 超大深度压气沉箱工法的施工技术[J]. 地下空间与工程学报，2004，24(增1)：699–703.(PENG Fangle，SUN Dexin，OHUCHI M，et al. Pneumatic caisson construction technology for very deep underground engineering[J]. Chinese Journal of Underground Space and Engineering，2004，24(Supp. 1)：699–703.(in Chinese))

[3] 李耀良，姜春辉，邓前锋. 全自动、可遥控的现代气压沉箱施工及其关键技术的研究[J]. 建筑施工，2008，30(1)：2–4.(LI Yaoliang，JIANG Chunhui，DENG Qianfeng. Key construction techniques for modern pneumatic caisson practice with fully automatic and remote control[J]. Building Construction. 2008，30(1)：2–4.(in Chinese))

[4] 梅田法義，藤井直，井上智裕. ニューマチックケーソン施工過程の数値解析[J]. 応用力学論文集，2006，(9)：603–612.

[5] 井上智裕，藤井直，大内正敏. ニューマチックケーソン工法によるトンネル施工時の周辺地盤変形解析について[J]. トンネル工学論文集，2006，(16)：155–164.

[6] HONG W，YEA G G，KIM T H，et al. Evaluation of unit skin friction to large size pneumatic caisson during the process of sinking[C]// Proceedings of the 15th International Offshore and Polar Engineering Conference. Cupertino，California：The International Society of Offshore and Polar Engineers，2005：555–561.

[7] 王红霞，王德禹. 大型沉井结构施工力学模型的研究[J]. 力学季刊，2003，24(1)：68–74.(WANG Hongxia，WANG Deyu. Mechanics model study in large extra caissons construction[J]. Chinese Quarterly of Mechanics，2003，24(1)：68–74.(in Chinese))

[8] PLAXIS B V. Plaxis Professional(version 7.2)，geotechnical finite element code for soil and rock analyses(CD-ROM)[M]. Delft：[s. n.]，1998.

[9] 葛春晖. 钢筋混凝土沉井设计施工手册[M]. 北京：中国建筑工业出版社，2004.(GE Chunhui. Handbook of design and construction of open caisson[M]. Beijing：China Architecture and Building Press，2004.(in Chinese))

[10] TAYLOR W D. Fundamentals of soil mechanics[M]. New York： John Wiley and Sons，Inc.，1963：566–569.

[11] TERZAGHI K，PECK B R. Soil mechanics in engineering practice[M]. New York：John Wiley and Sons，Inc.，1960：167–175.

[12] SCHANZ T，VERMEER P A，BONNIER P G. The hardening soil model—formulation and verification[C]// BRINKGREVE R B J ed. Proceedings of Plaxis-Symposium：beyond 2000 in Computational Geotechnics—10 Years of PLAXIS．Rotterdam：A. A. Balkema，1999：281–296.

[13] KUNG G T C，JUANG C H，HSIAO EVAN C L. Ground settlement caused by excavation in clay—an empirical method[C]// ZHU H H et al. ed. Proceedings of Sessions of Shanghai，Underground Construction and Ground Movement，Geotechnical Special Publication No. 155. New York：American Society of Civil Engineers，2006：363–370.

[14] KUNG G T C，JUANG C H，HSIAO E C L，et al. Simplified model for wall deflection and ground-surface settlement caused by braced excavation in clays[J]. Journal of Geotechnical and Geoenvironmental Engineering，2007，133(6)：731–747.

[15] CLOUGH G W， O¢ROURKE T D. Construction induced movements of in situ walls[C]// LAMBE P and HANSEN L A ed. Proceedings of the 1990 Specialty Conference，Design and Performance of Earth Retaining Structure，Geotechnical Special Publication No.25. New York：American Society of Civil Engineers，1990：439–470.

[16] HSIEH P G，OU C Y. Shape of ground surface settlement profiles caused by excavation[J]. Canadian Geotechnical Journal，1998，35(6)：1 004–1 017.

[17] OU C Y，HSIEH P G，CHIOU D C. Characteristics of ground surface settlement during excavation[J]. Canadian Geotechnical Journal，1993，30(5)：758–767.