[1]张瑞坤,石名磊,倪富健,等.无锡大直径超长钻孔灌注桩承载性状试验研究[J].东南大学学报(自然科学版),2012,42(6):1194-1200.[doi:10.3969/j.issn.1001-0505.2012.06.031]
 Zhang Ruikun,Shi Minglei,Ni Fujian,et al.Experimental study of the bearing properties of large-diameter and super-long bored pile in Wuxi[J].Journal of Southeast University (Natural Science Edition),2012,42(6):1194-1200.[doi:10.3969/j.issn.1001-0505.2012.06.031]
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无锡大直径超长钻孔灌注桩承载性状试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
42
期数:
2012年第6期
页码:
1194-1200
栏目:
土木工程
出版日期:
2012-11-20

文章信息/Info

Title:
Experimental study of the bearing properties of large-diameter and super-long bored pile in Wuxi
作者:
张瑞坤 石名磊 倪富健 王晋
东南大学交通学院, 南京 210096
Author(s):
Zhang Ruikun Shi Minglei Ni Fujian Wang Jin
School of Transportation, Southeast University, Nanjing 210096, China
关键词:
大直径超长钻孔灌注桩 荷载传递 静载试验 桩侧阻力 桩端阻力
Keywords:
large-diameter and super-long bored pile load transmission static load test side friction of pile tip resistance of pile
分类号:
TU473
DOI:
10.3969/j.issn.1001-0505.2012.06.031
摘要:
基于无锡地铁高架桥试桩工程中4根大直径超长钻孔灌注桩的现场静荷载试验和桩身应力测试试验,结合同一地区12根同类型桩的试验成果,研究了无锡地区大直径超长钻孔灌注桩竖向荷载下的侧、端阻力发挥特点和荷载传递规律.研究表明:不同的大直径超长钻孔灌注桩施工工艺会造成桩底沉渣厚度差异,宏观表现为Q-s曲线形态呈陡降型或缓变型.大直径超长钻孔灌注桩单桩受竖向荷载,侧摩阻力从上到下逐步发挥,侧、端阻力非同步发挥且相互影响.不同埋深条件下,物理性质相同土层提供的侧摩阻力实测极限值与规范推荐值差异较大,说明侧摩阻力深度效应显著,且浅层黏土易发生软化效应.发挥侧摩阻力极限值所需桩土相对位移为4~7 mm.该结论可指导该地区同类工程的设计和施工.
Abstract:
The static load test and the pile stress test of four large-diameter and super-long bored piles in Wuxi Subway project were carried out. The characteristics of the pile’s skin friction resistance, the tip resistance and the load transmission law were analyzed based on the test data together with the relevant test results from other 12 piles. The results show that the different bottom sediment thickness caused by different construction technologies lead to the steep drop or slow change of the Q-s curve shape. The skin friction resistance of the large-diameter and super-long bored piles exerts gradually from top to bottom. The skin friction and tip resistance do not work simultaneously and have mutual influence on each other. There are significant differences in side friction resistance between the measured values and the recommended values, which indicates that the depth effect of side friction resistance and the softening effect of the shallow cohesive soil are both notable. The value of pile-soil displacement boundary under ultimate load is 4 to 7 mm. The conclusions are useful for other similar engineering practices.

参考文献/References:

[1] 阳吉宝,钟正雄.超长桩的荷载传递机理[J].岩土工程学报,1998,20(6):108-112.
  Yang Jibao,Zhong Zhengxiong.Research on load transfer mechanism of super-long pile[J].Chinese Journal of Geotechnical Engineering,1998,20(6):108-112.(in Chinese)
[2] 朱向荣,方鹏飞,黄洪勉,等.深厚软基超长桩工程性状试验研究[J].岩土工程学报,2003,25(1):76-79.
  Zhu Xiangrong,Fang Pengfei,Huang Hongmian,et al.Research on super-long pile in soft clay[J].Chinese Journal of Geotechnical Engineering,2003,25(1):76-79.(in Chinese)
[3] 胡庆立,张克绪.大直径桩的竖向承载性能研究[J].岩土工程学报,2002,24(4):491-495.
  Hu Qingli,Zhang Kexu.Research on axial bearing behavior of large diameter piles[J].Chinese Journal of Geotechnical Engineering,2002,24(4):491-495.(in Chinese)
[4] 石名磊,邓学钧,刘松玉.大直径钻孔灌注桩桩侧极限摩阻力研究[J].建筑结构,2003,33(11):13-16.
  Shi Minglei,Deng Xuejun,Liu Songyu.Study on shaft skin friction resistance of large diameter bored piles [J].Building Structure,2003,33(11):13-16.(in Chinese)
[5] 王陶,马晔.超长钻孔桩竖向承载性状的试验研究[J].岩土力学,2005,26(7):1053-1057.
  Wang Tao,Ma Ye.Study on over-length drilled pile bearing behavior under vertical load[J].Rock and Soil Mechanics,2005,26(7):1053-1057.(in Chinese)
[6] 吴鹏,龚维明,梁书亭.考虑深度效应的超长单桩荷载传递性状研究[J].岩土力学,2007,28(6):1265-1268.
  Wu Peng,Gong Weiming,Liang Shuting.Study on load transfer law of over length piles considering depth effect[J].Rock and Soil Mechanics,2007,28(6):1265-1268.(in Chinese)
[7] 赵春风,鲁嘉,孙启超,等.大直径深长钻孔灌注桩分层荷载传递特性试验研究[J].岩石力学与工程学报,2009,28(5):1020-1026.
  Zhao Chunfeng,Lu Jia,Sun Qichao,et al.Experimental study of load transmission property of large-diameter bored cast-in-situ deep and long pile in different soil layers[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(5):1020-1026.(in Chinese)
[8] 中华人民共和国行业标准编写组.JGJ 94—2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.
[9] 石名磊.大直径钻孔灌注桩的承载力与沉降研究[D].南京:东南大学交通学院,2002.
[10] 黄明聪,龚晓南,赵善锐.钻孔灌注长桩试验曲线型式及破坏机理探讨[J].铁道学报,1998,20(4):93-97.
  Huang Mingcong,Gong Xiaonan,Zhao Shanrui.Styles of test curves and damage mechanism of long bored piles[J].Journal of the China Railway Society,1998,20(4):93-97.(in Chinese)
[11] 张忠苗,张乾青.桩端土强度对桩侧阻力影响的研究[J].岩土工程学报,2010,32(2):59-63.
  Zhang Zhongmiao,Zhang Qianqing.Influences of soil strength at pile end on friction of lateral surface of piles[J].Chinese Journal of Geotechnical Engineering,2010,32(2):59-63.(in Chinese)
[12] 蒋建平,高广运,章杨松.桩端岩土强度提高对超长桩桩身总侧阻力的强化效应研究[J].岩土力学,2009,30(9):2609-2615.
  Jiang Jianping,Gao Guangyun.Zhang Yangsong.Strengthening effect of total pile lateral friction by improving rock or soil strength at pile tip[J].Rock and Soil Mechanics,2009,30(9):2609-2615.(in Chinese)

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备注/Memo

备注/Memo:
作者简介: 张瑞坤(1985—),男,博士生; 石名磊(联系人),男,博士,教授,mingleish@163.com.
基金项目: 建设部研究开发资助项目(2008-K2-12).
引文格式: 张瑞坤,石名磊,倪富健,等.无锡大直径超长钻孔灌注桩承载性状试验研究[J].东南大学学报:自然科学版,2012,42(6):1194-1200. [doi:10.3969/j.issn.1001-0505.2012.06.031]
更新日期/Last Update: 2012-11-20