塑料套管现浇混凝土桩倾斜对承载性能影响的模型试验研究

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (382 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要通过模型试验研究竖直桩与倾斜角度为5°，8°，10°和15°倾斜桩的承载性能，分析倾斜对塑料套管现浇混凝土桩(以下简称TC桩)单桩承载力、桩顶沉降、桩身水平位移、桩身弯矩、桩身轴力及侧摩阻力和端阻比的影响。模型试验结果表明：(1) 当TC桩倾斜度不大于8°时，对承载力和桩顶沉降影响不明显，对于倾斜10°，15°的桩，承载力明显降低；(2) 倾斜桩桩身水平位移和弯矩主要发生于1/3桩长范围内，且均随着荷载和倾角的增加而增大；(3) 竖直桩及各倾斜桩的侧摩阻力随深度的增加呈先增大后减小的趋势，随着倾角的增大桩极限侧摩阻力的平均值略有增大，侧摩阻分担比较大；(4) 端阻力和端阻比基本随荷载的增加而增加，随倾角的增加而减小。采用Origin软件应用Sigmoidal函数拟合，得出模型桩极限承载力随桩体倾角的计算公式，并根据现场实测数据，给出现场应用时修正系数的取值范围。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章

关键词 ：桩基工程, 塑料套管现浇混凝土桩, 承载性能, 倾斜, 模型试验

Abstract：The bearing behaviors of vertical pile and inclined piles with inclination angles of 5°，8°，10° and 15° are contrasted according to model test. Effects of inclination on the bearing capacity of single plastic tube cast-in-place concrete pile(TC pile for short)，pile-top settlement，pile shaft horizontal displacement，bending moment along pile shaft，skin friction and the ratio of tip resistance to load on pile top are analyzed. The model test results show that：(1) Effects of pile inclination on the bearing capacity and pile-top settlement are not apparent when the inclination angle of TC pile is less than 8°；but for the inclined piles with inclination angles of 10° and 15°，the reduction of bearing capacity of single pile is significant. (2) Horizontal displacement and bending moment of pile shaft mainly occur in the upper one third of pile length；and both go up with the increase of load and inclination angle. (3) Skin frictions of vertical pile and each inclined pile first increase and then decrease with the increase of pile depth；and the mean values of ultimate skin frictions increase slightly with the increase of inclination angle；and the bearing ratio of skin friction is large. (4) Tip resistance and the ratio of tip resistance to load on pile top go up with the increase of load and fall with the increase of inclination angle. The Origin software is applied to fit the curve between ultimate bearing capacity and inclination angle with Sigmoidal function. The formula is obtained to calculate the ultimate bearing capacity of inclined pile. Based on the field data，the range of correction factor is gained.

Key words： pile foundations plastic tube cast-in-place concrete pile bearing behavior inclination model test

收稿日期: 2010-12-17

引用本文:

王新泉1，陈永辉2，3，安永福4，齐昌广2，3，陈龙2，3. 塑料套管现浇混凝土桩倾斜对承载性能影响的模型试验研究[J]. 岩石力学与工程学报, 2011, 30(4): 834-842.
WANG Xinquan1，CHEN Yonghui2，3，AN Yongfu4，QI Changguang2，3，CHEN Long2，3. MODEL TEST STUDY OF EFFECT OF INCLINATION ON BEARING BEHAVIORS OF PLASTIC TUBE CAST-IN-PLACE CONCRETE PILE. , 2011, 30(4): 834-842.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I4/834

[1]	苏杰. 塑料套管现浇混凝土桩新型地基处理方式的试验研究[硕士学位论文][D]. 南京：河海大学，2008.(SU Jie. In-situ test study on new foundation treatment technique of plastic tube cast-in-place concrete pile[M. S. Thesis][D]. Nanjing：Hohai University，2008.(in Chinese)) " target="_blank">
[3]	郝忠. 塑料套管现浇混凝土桩单桩承载特性研究[硕士学位论文][D]. 南京：河海大学，2009.(HAO Zhong. Study on the bearing characteristics of single plastic tube cast-in-place concrete pile[M. S. Thesis][D]. Nanjing：Hohai University，2009.(in Chinese)) " target="_blank">
[2]	张开伟. 塑料套管现浇混凝土桩复合地基桩土应力比试验研究[硕士学位论文][D]. 南京：河海大学，2009.(ZHANG Kaiwei. In-situ test study on pile-soil stress ratio of composite-foundation of plastic tube cast-in-place concrete pile[M. S. Thesis][D]. Nanjing：Hohai University，2009.(in Chinese)) " target="_blank">
[5]	周健，张刚，曾庆有. 主动侧向受荷桩模型试验与颗粒流数值模拟研究[J]. 岩土工程学报，2007，29(5)：650-656.(ZHOU Jian，ZHANG Gang，ZENG Qingyou. Model tests and PFC2D numerical analysis of active laterally loaded piles[J]. Chinese Journal of Geotechnical Engineering，2007，29(5)：650-656.(in Chinese))
[6]	安永福. 塑料套管混凝土桩倾斜对竖向承载特性的影响研究[硕士学位论文][D]. 南京：河海大学，2010.(AN Yongfu. Study on bearing deformation behaviour of single oblique piles of plastic tube cast- in-place concrete pile under vertical load[M. S. Thesis][D]. Nanjing：Hohai University，2010.(in Chinese)) " target="_blank">
[9]	PADRON L A，AZNAREZ J J，MAESO O，et al. Dynamic stiffness of deep foundations with inclined piles[J]. Earthquake Engineering and Structural Dynamics，2010，39(12)：1 343-1 367. " target="_blank">
[10]	ESCOFFIER S，CHAZELAS J L，GAMIER J. Centrifuge modeling of raked piles[J]. Bulletin of Earthquake Engineering，2008，6(4)：689-704.
[13]	MEYERHOF G G. Behaviour of pile foundations under special loading conditions：1994 R. M. Hardy keynote address[J]. Canadian Geotechnical Journal，1995，32(2)：204-222. " target="_blank">
[14]	郑刚，王丽. 竖向荷载作用下倾斜桩的荷载传递性状及承载力研究[J]. 岩土工程学报，2008，30(3)：323-330.(ZHENG Gang，WANG Li. Load transfer and bearing capacity of inclined pile under vertical load[J]. Chinese Journal of Geotechnical Engineering，2008，30(3)：323-330.(in Chinese))
[17]	RAJASHREE S S，SITHARAM T G. Nonlinear finite-element modeling of batter piles under lateral load[J]. Journal of Geotechnical and Geoenvironmental Engineering，2001，127(7)：604-612. " target="_blank">
[4]	徐建平，周健，许朝阳，等. 沉桩挤土效应的模型试验研究[J]. 岩土力学，2000，21(3)：235-238.(XU Jianping，ZHOU Jian，XU Chaoyang，et al. Model test research on pile driving effect of squeezing against soil[J]. Rock and Soil Mechanics，2000，21(3)：235-238.(in Chinese)) " target="_blank">
[7]	GIANNAKOU A，GEROLYMOS N，GAZETAS G，et al. Seismic behavior of batter piles：elastic response[J]. Journal of Geotechnical and Geoenvironmental Engineering，2010，136(9)：1 187-1 199. " target="_blank">
[11]	ZHANG L M，MCVAY M C，HAN S J，et al. Effects of dead loads on the lateral response of battered pile group[J]. Canadian Geotechnical Journal，2002，39(3)：561-575. " target="_blank">
[15]	孔纲强，杨庆，郑鹏一，等. 考虑时间效应的斜桩基负摩阻力室内模型试验研究[J]. 岩土工程学报，2009，31(4)：617-621.(KONG Gangqiang，YANG Qing，ZHENG Pengyi，et al. Model tests on negative skin friction resistance for inclined pile foundation considering time effect[J]. Chinese Journal of Geotechnical Engineering，2009，31(4)：617-621.(in Chinese))
[19]	屠毓敏，魏汝龙. 曲桩竖向承载力的确定[J]. 土木工程学报，1999，32(4)：64-68.(TU Yumin，WEI Rulong. Determination of the vertical bearing capacity of bent piles[J]. China Civil Engineering Journal，1999，32(4)：64-68.(in Chinese)) " target="_blank">
[8]	GEROLYMOS N，GIANNAKOU A，ANASTASOPOULOS I，et al. Evidence of beneficial role of inclined piles：observations and summary of numerical analyses[J]. Bulletin of Earthquake Engineering，2008，6(4)：705-722.
[12]	MEYERHOF G G，YALCIN A S. Behaviour of flexible batter piles under inclined loads in layered soil[J]. Canadian Geotechnical Journal，1993，30(2)：247-256. " target="_blank">
[16]	武军. 深厚软土中斜桩桩土相互作用研究[硕士学位论文][D]. 成都：西南交通大学，2009.(WU Jun. Study on pile-soil-pile interaction effects of battered pile in deep soft soil[M. S. Thesis][D]. Chengdou：Southwest Jiaotong University，2009.(in Chinese)) " target="_blank">
[18]	云天铨，云飞，张桂标. 刚性斜桩顶部受任意力的位移的线载荷积分方程法的分析[J]. 应用力学学报，1992，9(4)：114-123.(YUN Tianquan，YUN Fei，ZHANG Guibiao. Analysis of displacement of rigid sloping pile under arbitrary loads at top by line-loaded integral equation method[J]. Chinese Journal of Applied Mechanics，1992，9(4)：114-123.(in Chinese)) " target="_blank">
[20]	中华人民共和国行业标准编写组. JGJ106—2003建筑基桩检测技术规范[S]. 北京：中国建筑工业出版社，2003.(The Professional Standards Compilation Group of People?s Republic of China. JGJ106—2003 Technical code for testing of building foundation piles[S]. Beijing：China Architecture and Building Press，2003.(in Chinese)) " target="_blank">