立柱桩在深基坑分步开挖过程中的上拔位移分析

楼晓明; 杨晶; 李德宁; 刘建航

立柱桩在深基坑分步开挖过程中的上拔位移分析 English Version

1. 同济大学地下建筑与工程系，上海 200092; 2. 上海申通地铁公司，上海 200031

基金项目: 国家自然科学基金项目（50978201）

详细信息

作者简介:
楼晓明（1965- ），男，博士，副教授。E-mail: louhanliang45502@vip.sina.com。

中图分类号: TU432
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出版历程
- 收稿日期: 2012-02-05
- 发布日期: 2013-01-31

Uplift displacement of soldier piles during stepped excavation of deep foundation pits

1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Shanghai Shentong Metro Company, Shanghai 200031, China

摘要

摘要: 基于对坑底地基卸荷应力与回弹变形的新认识和一种可考虑桩间土承受附加荷载与变形的广义荷载传递法，提出了深基坑立柱桩因开挖而隆起的分析方法。该方法可考虑立柱桩的变截面特性以及分步设撑、开挖的施工工况，可分析桩土之间的荷载传递特性。由于支撑立柱桩容易实施位移观测，立柱桩的分析结果便于与实测结果比较，为分析方法的完善、计算参数的合理选取提供基础。通过和2个工程实例对比，验证了用本方法计算立柱桩在开挖过程中受力及位移的合理性，同时对计算值与实测值的差异原因进行了讨论。
- 深基坑 /
- 立柱桩 /
- 荷载传递法 /
- 隆起 /
- 上拔位移
Abstract: Based on the new understanding about rebound stress and deformation at the bottom of deep foundation pits and the generalized load transfer method considering the additional load or deformation of the soil around piles, an analytical method is proposed for the uplift of soldier piles due to excavation. It can take many factors into account, e.g., variable cross-section character of soldier piles, installation and stepped excavation of strut system and construction situation, and it can be employed to analyze the load transfer behaviors of soldier piles. Because the uplift displacement of the soldier piles is easily monitored, the calculated results are easily compared with the measured ones, which can improve the method itself and the parameters to be chosen more reasonably. Through two cases, the rationality of the proposed method to calculate the uplift displacement of soldier piles is validated. The difference between the calculated and the measured values is also discussed.
- deep foundation pit /
- soldier pile /
- load transfer method /
- heave /
- uplift displacement

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参考文献(15)

[1]	朱火根,孙加平. 上海地区深基坑开挖坑底土体回弹对工程桩的影响[J]. 岩土工程界, 2005,8(3):43-46 ZHU Huo-gen, SUN Jia-ping. Impact of subsoil rebound on engineering piles due to deep excavation in soft soil area[J]. Geotechnical Engineering World, 2005,8(3):43-46. (in Chinese))
[2]	POULOS H G, DAVIS E H. Pile foundation analysis and design[M]. New York: Wiley, 1980.
[3]	杨敏,禄建栋. 深开挖基坑回弹引起的坑中桩受力与位移计算[J]. 同济大学学报自然科学版, 2010,38(12):1730-1735 YANG Min, LU Jian-dong. A calculation of behavior of underpinning pile subject to excavation of deep foundation pit[J]. Journal of Tongji University (Natural Science), 2010,38(12):1730-1735. (in Chinese))
[4]	刘国彬,侯学渊. 软土基坑隆起变形的残余应力法[J]. 地下工程与隧道, 1996(2):1-7 LIU Guo-bin, HOU Xue-yuan. Residual stress method of rebound deformation of foundation pit in soft soil area[J]. Underground Engineering and Tunnels, 1996(2):1-7. (in Chinese))
[5]	SEED H B, REESE L C. The action of soft clay along friction piles[J]. Transaction, ASCE,1957, 122:731-754
[6]	楼晓明,孙晓锋. 大面积带垫层刚性桩复合地基的荷载传递分析方法[J]. 岩土工程学报, 2006,28(11):2027-2030 LOU Xiao-ming, SUN Xiao-feng. Analysis on load transfer for large area composite foundation with rigid piles and cushions[J]. Chinese Journal of Geotechnical Engineering, 2006,28(11):2027-2030. (in Chinese))
[7]	胡琦,凌道盛,陈云敏,等. 深基坑开挖对坑内基桩受力特性的影响分析[J]. 岩土力学, 2008,29(7):1965-1970 HU Qi, LING Dao-sheng, CHEN Yun-min,et al. Study of loading characters of pile foundation due to unloading of deep foundation pit excavation[J]. Rock and Soil Mechanics, 2008,29(7):1965-1970. (in Chinese))
[8]	巢斯,王磊,雷小虎,等. 上海软土地区深基坑回弹引起桩拉力的探讨[J]. 结构工程师, 2009,25(5):88-92 CHAO Si, WANG Lei, LEI Xiao-hu,et al. Discussion on tensile force of piles caused by subsoil rebound in soft soil area[J]. Structural Engineers, 2009,25(5):88-92. (in Chinese))
[9]	肖健. 考虑工程桩存在的深基坑回弹空间效应有限元分析[D]. 天津: 天津大学, 2004. XIAO Jian. FEM analysis on 3D behavior of the pit resilience considering foundation piles[D]. Tianjin: Tianjin University, 2004.(in Chinese))
[10]	范巍. 大面积深基坑开挖过程中桩基受力特性研究[D]. 上海: 上海交通大学, 2007. FAN Wei. Behavior of pile foundation during large-scale deep excavation[D]. Shanghai: Shanghai Jiao Tong University, 2007.(in Chinese))
[11]	葛强强. 超深开挖对单桩承载性状的影响性研究[D]. 天津: 天津大学, 2008. GE Qiang-qiang. Impact of ultra-deep excavation on bearing capacity of single pile[D]. Tianjin: Tianjin University, 2008.(in Chinese))
[12]	贺翀. 深基坑的立柱桩隆起计算[J]. 岩土工程学报, 2010,32(增刊1):74-78 HE Chong. Calculation of heave of soldier piles in deep foundation pits[J]. Chinese Journal of Geotechnical Engineering, 2010,32(S1):74-78. (in Chinese))
[13]	楼晓明,李德宁,刘建航. 深基坑坑底地基的回弹应力与回弹变形[J]. 土木工程学报, 2012,45(14):134-138 LOU Xiao-ming, LI De-ning, LIU Jian-hang. Rebound stress and deformation below the bottom of deep excavations[J]. China Civil Engineering Journal, 2012,45(14):134-138. (in Chinese))
[14]	江娟,亓宾,刘国彬. 软土深基坑中立柱桩变形影响因素和变形预测研究[J]. 岩土工程学报, 2008,30(增刊1):363-368 JIANG Juan, QI Bin, LIU Guo-bin. Factors and prediction on deformation of soldier piles in deep foundation pits in soft area[J]. Chinese Journal of Geotechnical Engineering, 2008,30(S1):363-368. (in Chinese))
[15]	刘涛,刘万兰,刘国彬. 超深基坑立柱桩竖向位移引起危害探讨[J]. 土木工程学报, 2007,40(增刊1):387-390 LIU Tao, LIU Wan-lan, LIU Guo-bin. Discussions on vertical displacement of stud piles in deep foundation pit[J]. China Civil Engineering Journal, 2007,40(S1):387-390. (in Chinese))