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J4  2012, Vol. 46 Issue (7): 1262-1268    DOI: 10.3785/j.issn.1008-973X.2012.07.017
机械与能源工程     
自平衡法试桩的承载特性试验研究
徐长节,李碧青,蔡袁强
浙江大学 软土与环境工程教育部重点实验室,浙江 杭州 310058
Bearing behaviors of self-balanced pile
XU Chang-jie, LI Bi-qing, CAI Yuan-qiang
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China
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摘要:

通过分别采用自平衡法试桩和静载法试桩对杭州市某工程6根抗压试桩进行对比测试,分析基桩在自平衡法试桩条件下的Q-s曲线、桩身轴力、侧摩阻力等分布规律,并与静载法试桩条件下桩身受力性状进行对比研究.研究结果表明:自平衡法试桩上部桩与静载法试桩的桩身受力特性差别较大.前者桩侧摩阻力由下及上发挥,后者桩侧摩阻力由上及下发挥.砂性土、黏性土及圆砾的侧摩阻力折减系数可取0.688、0.774、0.860.在本工程土质情况下,自平衡法试桩的侧摩阻力折减系数可取0.782.自平衡法试桩的经转换后的Q-s曲线较平滑,且在加载值较小时与静载法试桩的Q-s曲线有一定差异,但随着加载值的增大,两者的曲线趋于一致,说明了自平衡法试桩的可靠性.

Abstract:

Comparative tests of the six compressive test piles of a project in Hangzhou were taken by static load test and self-balanced test. The distribution properties of Q-s curves, axial force, side friction and other factors of the piles under self-balanced test were analyzed and compared to the static load test. The test results indicate that the force characteristics of the piles by two methods are different. The side friction begins to exert from down to up with selfbalanced test, which exerts oppositely with static load test. The reduction factor of sandy soil, clay and gravel could be 0.688, 0.774 and 0.860. For the soil in this project, the side friction reduction factor of self-balanced test could be 0.782. The Q-s curve conversed from self-balanced test is much smoother than static load test. When the loading level is low, there is distinguished difference between the converted Q-s curves with self-balanced test and the Q-s curves with static load test. The two Q-s curves tend to be similar with the heightening of loading level, which shows the reliability of self-balanced test.

出版日期: 2012-07-01
:  TU 443  
基金资助:

国家 “十一五”科技支撑计划资助项目(2006BAJ03A02-02).

作者简介: 徐长节(1972-), 男, 教授, 博导, 从事桩基工程及基坑工程的研究. E-mail: xucj@zju.edu.cn
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引用本文:

徐长节,李碧青,蔡袁强. 自平衡法试桩的承载特性试验研究[J]. J4, 2012, 46(7): 1262-1268.

XU Chang-jie, LI Bi-qing, CAI Yuan-qiang. Bearing behaviors of self-balanced pile. J4, 2012, 46(7): 1262-1268.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2012.07.017        http://www.zjujournals.com/eng/CN/Y2012/V46/I7/1262

[1] JORI O. New device for load testing driven piles and drilled shaft separates friction and end bearing [J]. Piling and Deep Foundations, 1989(1): 421-427.
[2] 中华人民共和国交通运输部. JT/T 7382009, 基桩静载试验自平衡法[S]. 北京: 人民交通出版社, 2009.
[3] 龚维明, 戴国亮, 蒋永生, 等. 桩承载力自平衡测试理论与实践[J]. 建筑结构学报, 2002, 23(1): 82-88.
GONG Weiming, DAI Guoliang, JIANG Yongsheng, et al. Theory and practice of selfbalanced loading test for pile bearing capacity [J]. Journal of Building Structures, 2002, 23(1): 82-88.
[4] 龚维明, 蒋永生, 翟晋. 桩承载力自平衡测试法[J]. 岩土工程学报, 2000, 22(5): 532-536.
GONG Weiming, JIANG Yongsheng, ZHAI Jin. Selfbalanced loading test for pile bearing capacity [J]. Chinese Journal of Geotechnical Engineering, 2000, 22(5): 532-536.
[5] 刘杰, 张可能. 层状地基中单桩荷载传递规律[J]. 中南大学学报:自然科学版, 2003, 34(5): 571-575.
LIU Jie, ZHANG Keneng. Single pile loadtransfer law in layered ground [J]. Journal of Central South University of Technology:Natural Science, 2003, 34(5): 571-575.
[6] 戴国亮, 龚维明, 刘新良. 自平衡试桩法桩土荷载传递机理原位测试[J]. 岩土力学, 2003,24(6): 1065-1069.
DAI Guoliang, GONG Weiming, LIU Xinliang. Experimental study of pilesoil load transfer behavior of selfbalanced pile [J]. Rock and Soil Mechanics, 2003, 24(6): 1065-1069.
[7] 马晔, 王陶. 超长钻孔桩自平衡法荷载试验研究[J]. 岩土工程学报, 2005, 27(3): 275-278.
MA Ye, WANG Tao. Experimental study on bearing behavior of superlong drilled pile with the selfbalanced load test method [J]. Chinese Journal of Geotechnical Engineering, 2005, 27(3): 275-278.
[8] 于清泉, 龚维明, 梁书亭. 卵石地区自平衡深层荷载试验的应用[J]. 岩石力学与工程学报, 2010, 9(增2): 3847-3851.
YU Qingquan, GONG Weiming, LIANG Shuting. Application of selfbalance deep level load test in pebble bed area [J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 9(supp.2): 3847-3851.
[9] 黄思勇, 熊刚, 罗昊冲, 等. 津滨轻轨基础托换桩基承载力的自平衡试验[J]. 武汉大学学报:工学版, 2010, 43(4): 511-514.
HUANG Siyong, XIONG Gang, LUO Haochong, et al. Selfbalanced loading test for pile bearing capacity of pile underpinning on Jinbin light track [J]. Engineering Journal of Wuhan University, 2010, 43(4): 511-514.
[10] 熊巨华, 蒋益平, 杨敏. 自平衡试桩结果的解析转换法[J]. 同济大学学报:自然科学版, 2007, 35 (2): 161-165.
XIONG Juhua, JIANG Yiping, YANG Min. Analytical solution transformation method for data of Ocell pile testing [J]. Journal of Tongji University: Natural Science, 2007, 35 (2): 161-165.
[11] 朱向荣, 汪胜忠, 叶俊能, 等. 自平衡试桩荷载传递模型及荷载:沉降曲线转换方法改进研究[J]. 岩土工程学报, 2010, 32(11): 1717-1721.
ZHU Xiangrong, WANG Shengzhong, YE Junneng, et al. Load transfer model and improved transition method for loadsettlement curve under Ocell pile testing method [J]. Chinese Journal of Geotechnical Engineering, 2010, 32(11): 1717-1721.
[12] 陈小强, 赵春风, 甘爱明. 成层土中抗拔桩与抗压桩的模型试验研究[J]. 地下空间与工程学报,2009,5(增刊): 1537-1541.
CHEN Xiaoqiang, ZHAO Chunfeng, GAN Aiming. Study on model test of uplift and compression piles in layered soil [J]. Chinese Journal of Underground Space and Engineering, 2009, 5(supplement): 1537-1541.
[13] 张晓炜. 试桩测试方法对桩基承载特性的影响研究[J]. 岩土力学, 2005, 26 (11): 1819-1833.
ZHANG Xiaowei. Study on the influence of test methods on the bearing behaviors of piles [J]. Rock and Soil Mechanics, 2005, 26(11): 1819-1833.
[14] 中华人民共和国住房和城乡建设部. JGJ 1062003, 建筑基桩检测技术规范[S]. 北京: 中国建筑工业出版社, 2003.
[15] XI Xiaozhou, CHEN Longzhu, LIU Wei. An analytical solution to transform Ocell pile test data into conventional loadsettlement curve [J]. Geotechnical Special Publication, 2010, 205GSP: 192-199.

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