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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)  2017, Vol. 51 Issue (8): 1527-1536    DOI: 10.3785/j.issn.1008-973X.2017.08.007
Civil and Traffic Engineering     
Deformation behaviors of deep top-down metro excavation in Shanghai soft clay
KANG Zhi-jun1,2, HUANG Run-qiu3, WEI Bin4, TAN Yong1,5
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
2. Poly(CHENGDU) Holdings Company Limited, Chengdu 610000, China;
3. National Professional Laboratory of Geological Hazards Prevention and Geological Environment Protection, Chengdu University of Technology, Chengdu 610059, China;
4. China Railway Eryuan Engineering Group Company, East China Survey and Design limited Company, Shanghai 200023, China;
5. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
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Abstract  

The measured deformation behaviors of the excavation and its influences on environment were analyzed based on field instrumentation data from a top-down excavation in Shanghai soft clay. Results showed that excavation behaviors exhibited apparent spatial corner effect. The maximum lateral wall deflections at the central standard segments were (0.25%~0.45%)H, greater than (0.10%~0.25%)H at end shafts. The upper bound of column uplifts was around 0.26%H at the central standard segments, greater than 0.18% H at end shafts. The settlements of utility pipelines near the central standard segments were greater too. The existing underground structures adjacent to the west pit side imposed apparent barrier effect on excavation deformations, i.e., relatively smaller lateral wall deflections were measured along the west pit side. Excavating induced significant settlements of adjacent buildings on shallow-foundation. The monitored wall cracking indicated that structural integrity of these buildings was damaged to different extents. Noticeable post-excavation settlements were observed at adjacent buildings and utility pipelines, due to creeping of soft clay.

Received: 28 January 2016      Published: 16 August 2017
CLC:  TU447  
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Cite this article:

KANG Zhi-jun, HUANG Run-qiu, WEI Bin, TAN Yong. Deformation behaviors of deep top-down metro excavation in Shanghai soft clay. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(8): 1527-1536.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2017.08.007     OR     http://www.zjujournals.com/eng/Y2017/V51/I8/1527


上海软土地区某逆作法地铁深基坑变形

以上海软土地区某逆作法地铁车站深基坑项目为工程背景，通过分析现场监测数据，研究逆作法深基坑的变形性状及对周围环境的影响.研究结果发现：该基坑变形表现出显著的空间效应：中间标准段围护结构最大侧移的统计范围为（0.25%~0.45%）H，明显大于端头井的（0.10%~0.25%）H，中间标准段立柱隆起的上限为0.26%H，明显大于端头井的上限0.18%H，中间标准段开挖引起的管线沉降明显大于端头井开挖引起的管线沉降；既有地下结构对基坑变形有明显的遮拦效应，导致中间标准段西侧的围护结构侧向变形较小；基坑开挖导致邻近浅基础建筑物发生较大的沉降，甚至破坏建筑物的结构整体性，引发墙体开裂；受软土流变特性的影响，浅基础建筑物和地下管线都产生一定程度的工后沉降.

[1] PECK R B. Deep excavations and tunneling in soft ground[C]//Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering. Mexico City:International Society for Soil Mechanics and Geotechnical Engineering, 1969:225-290.
[2] CLOUGH G W, O'ROURKE T D. Construction induced movements of in situ walls[C]//Proceedings of the Design and Performance of Earth Retaining Structures. New York:ASCE, 1990:439-470.
[3] HSIEH P G, OU C Y. Shape of ground surface settlement profiles caused by excavation[J]. Canadian Geotechnical Journal, 1998, 35(6):1004-1017.
[4] BOSCARDIN M D, CORDING E J. Building response to excavation-induced settlement[J]. Journal of Geotechnical Engineering, ASCE, 1989, 115(1):1-21.
[5] 俞建霖,龚晓南.基坑工程变形性状研究[J].土木工程学报,2002,35(4):86-90. YU Jian-lin, GONG Xiao-nan. Research on deformation of foundation-pit engineering[J]. China Civil Engineering Journal, 2002, 35(4):86-90.
[6] 刘国彬,王卫东.基坑工程手册[M].2版.北京:中国建筑工业出版社,2009:149-153.
[7] WANG J H, XU Z H, WANG W D. Wall and ground movements due to deep excavations in Shanghai soft soils[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010, 136(7):985-994.
[8] TAN Y, WEI B, ZHOU X, et al. Lessons learned from construction of shanghai metro stations:importance of quick excavation, prompt propping, timely casting, and segmented construction[J]. Journal of Performance of Constructed Facilities, 2015, 29(4):04014096(1-15).
[9] TAN Y, WANG D L. Characteristics of a large-scale deep foundation pit excavated by the central-island technique in Shanghai soft clay.I:bottom-up construction of the central cylindrical shaft[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 139(11):1875-1893.
[10] XU C J, CHEN Q Z, WANG Y L, et al. Dynamic deformation control of retaining structures of a deep excavation[J]. Journal of Performance of Constructed Facilities, 2015, 04015071(1-11).
[11] 郑刚,李志伟.不同围护结构变形形式的基坑开挖对邻近建筑物的影响对比分析[J].岩土工程学报,2012,34(6):969-977. ZHENG Gang, LI Zhi-wei. Comparative analysis of responses of buildings adjacent to excavations with different deformation modes of retaining walls[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(6):969-977.
[12] 徐长节, 成守泽, 蔡袁强, 等. 非对称开挖条件下基坑变形性状分析[J]. 岩土力学, 2014, 35(7):1929-1934. XU Chang-jie, CHENG Shou-ze, CAI Yuan-qiang, et al. Deformation characteristic analysis of foundation pit under asymmetric excavation condition[J]. Rock and Soil Mechanics, 2014, 35(7):1929-1934.
[13] 应宏伟, 章丽莎, 谢康和, 等. 坑外地下水位波动引起的基坑水土压力响应[J]. 浙江大学学报:工学版, 2014, 48(3):492-497. YING Hong-wei, ZHANG Li-sha, XIE Kang-he, et al. Pore and earth pressure response to groundwater fluctuation out of foundation pit[J]. Journal of Zhejiang University:Engineering Science, 2014, 48(3):492-497.
[14] 徐中华, 王卫东, 王建华. 逆作法深基坑对周边保护建筑影响的实测分析[J]. 土木工程学报, 2009, 42(10):88-96. XU Zhong-hua, WANG Wei-dong, WANG Jian-hua. Considerations on foundation pit engineering[J]. China Civil Engineering Journal, 2009, 42(10):88-96.
[15] TAN Y, WANG D L. Characteristics of a large-scale deep foundation pit excavated by the central-island technique in Shanghai soft clay.Ⅱ:top-down construction of the peripheral rectangular pit[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 139(11):1894-1910.
[16] TAN Y, WEI B, DIAO Y P, et al. Spatial corner effects of long and narrow multi-propped deep excavations in shanghai soft clay[J]. Journal of Performance of Constructed Facilities, 2014, 28(4):04014015(1-17).
[17] TAN Y, LI X, KANG Z J, et al. Zoned excavation of an oversized pit close to an existing metro line in stiff clay:case study[J]. Journal of Performance of Constructed Facilities, 2014, 04014158(1-19)
[18] 朱炎兵,周小华,魏仕锋,等.临近既有地铁车站的基坑变形性状研究[J].岩土力学, 2013, 34(10):2997-3002. ZHU Yan-bing, ZHOU Xiao-hua, WEI Shi-feng, et al. Investigation on deformation behaviors of foundation pit adjacent to existing metro stations[J]. Rock and Soil Mechanics, 2013, 34(10):2997-3002.
[19] 付艳斌,朱合华,杨骏.软土卸荷时效性及其孔隙水压力变化试验研究[J].岩石力学与工程学报, 2009, 28(增刊1):3244-3249. FU Yan-bin, ZHU He-hua, YANG Jun. Experimental study on time-dependent properties and pore water pressure of soft soil under unloading[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(suppl1):3244-3249.
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