考虑蠕变的邻近地铁隧道深基坑开挖工序优化

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Abstract Research purposes:The existing researches about excavating procedures of deep foundation pit on nearby metro tunnel in soft formation are lack of systematicness, and creep characteristics of soft clay are not usually taken into consideration. This paper takes Qianhaiwan station of Metro Line 11 in Shengzhen as engineering background and considers creep characteristics in sludge formation. The influence of step excavation in the transversal,longitudinal and vertical directions on the deformation of foundation pit and nearby subway tunnel are simulated, which may be expected to provide theoretical basis for choosing foundation pit excavation procedure of Qianhaiwan station.Research conclusions:(1) The segment far away from tunnel should be excavated firstly when only transversal step excavation was undertaken along the horizontal direction of foundation pit. (2)The maximum horizontal displacement of the piles show exponential relations with the number of segments when step excavation of foundation pit was undertaken in vertical and transversal or longitudinal. If thickness of every step excavation was limited in 1.5~2 m, the horizontal displacement of the pile near tunnel can be reduced about 9 percent when there is no horizontal step excavation. (3) Transversal step excavation with segments far from tunnel excavated firstly was found to be the best step excavation method under the same condition of step number and support, and longitudinal and transversal step excavation followed while longitudinal step excavation was the last. (4) The research results have guiding significance for foundation pit of Qianhaiwan station and similar projects.

Key words： creep deformation excavating procedure numerical simulation

Received: 04 July 2014

PACS:

TB657

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	Articles by authors
	LIU Ji-qiang
	LI Yuan-hai
	LIN Zhi-bin
	GUI Chang-lin

Cite this article:

LIU Ji-qiang,LI Yuan-hai,LIN Zhi-bin, et al. Deep Foundation Pit Excavation Procedure Optimization Considering Creep Deformation on Nearby Metro Tunnel[J]. 铁道工程, 2014, 31(9): 108-114.

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2014/V31/I9/108

[1] 蒋洪胜,刘国彬,刘建航. 地铁车站软土基坑开挖过程中的时空效应分析[J]. 建筑技术,1999(2):80-82.
Jiang Hongsheng, Liu Guobin, Liu Jianhang. Analysis of Time-space Effect during the Soft Soil Foundation Pit Excavation in a Subway Station Project[J]. Architecture Technology,1999(2):80-82.
[2] 曾远,李志高. 基坑时间效应对临近地铁车站的变形影响[J]. 铁道建筑技术,2008(S):276-280.
Zeng Yuan, Li Zhigao. Time Effect on Deformation of Near the Subway Station Foundation Pit[J]. Railway Construction Technology,2008(S):276-280.
[3] 刘爱华,黎鸿,罗荣武. 时空效应理论在软土深基坑施工中的应用[J]. 地下空间与工程学报,2010(3):571-576.
Liu Aihua, Li Hong, Luo Rongwu. Application of the Space-time Effect Theory in the Soft Soil Foundation Construction[J]. Cheese Journal of Underground Space and Engineering,2010 (3):571-576.
[4] 刘杰. 深基坑开挖优化设计与下穿地铁隧道变形控制研究[D]. 合肥:合肥工业大学,2012.
Liu Jie. The Research on Deep Foundation Pit Excavation Optimization and the Lower Subway Tunnel′s Deformation Control[D]. Hefei: Hefei University of Technology,2012.
[5] 冯帆,张庆,刘哲. 基于FLAC3D的基坑开挖方案优选[J]. 路基工程,2010 (5):69-71.
Feng Fan, Zhang Qin, Liu Zhe. Optimization of Foundation Pit Excavation Program Based on FLAC3D[J]. Subgrade Engineering,2010 (5):69-71.
[6] 张光达. 高铁地下通道深基坑支护结构体系及开挖方案研究[D]. 成都:西华大学,2011.
Zhang Guangda. The Research of Supporting Structure System and Digging Strategies for Deep Foundation Pit in the High-speed Railway Underpass[D]. Chengdu: Xihua University,2011.
[7] 杜金龙,杨敏. 软土基坑开挖对邻近桩基影响的时效分析[J]. 岩土工程学报,2008 (7):1038-1043.
Du Jinlong, Yang Min. Time Effect Analysis of Influence of Excavation on Adjacent Pile Foundations[J]. Chinese Journal of Geotechnical Engineering,2008 (7):1038-1043.
[8] 王坤. 深圳土体蠕变特性在深基坑工程中的应用[J]. 铁道工程学报,2011 (8):53-57.
Wang Kun. Application of Soil Creep Characteristics in Deep Foundation Pit Project in Shenzhen [J]. Journal of Railway Engineering Society,2011 (8):53-57.
[9] 陈卫兵. 考虑岩土材料流变特性的强度折减法研究[D]. 武汉:中国科学院武汉岩土力学研究所,2008.
Chen Weibing. Study on Strength Reduction Technique Considering Rheological Proprety of Rock and Soil Medium[D]. Wuhan: The Chinese Academy of Sciences Wuhan, P. R. China,2008.