[1]刘路路,蔡国军,耿功巧,等.考虑土塞效应的开口管桩承载力CPTU计算方法[J].东南大学学报(自然科学版),2020,50(2):280-285.[doi:10.3969/j.issn.1001-0505.2020.02.011]
 Liu Lulu,Cai Guojun,Geng Gongqiao,et al.Calculation method for bearing capacity of open-ended pipe pile considering plugging effect of soil based on CPTU[J].Journal of Southeast University (Natural Science Edition),2020,50(2):280-285.[doi:10.3969/j.issn.1001-0505.2020.02.011]
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考虑土塞效应的开口管桩承载力CPTU计算方法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
50
期数:
2020年第2期
页码:
280-285
栏目:
土木工程
出版日期:
2020-03-20

文章信息/Info

Title:
Calculation method for bearing capacity of open-ended pipe pile considering plugging effect of soil based on CPTU
作者:
刘路路蔡国军耿功巧刘松玉
东南大学岩土工程研究所, 南京 211189
Author(s):
Liu Lulu Cai Guojun Geng Gongqiao Liu Songyu
Institute of Geotechnical Engineering, Southeast University, Nanjing 211189, China
关键词:
开口管桩 孔压静力触探 土塞效应 承载力
Keywords:
open-ended pipe pile piezocone penetration test plugging effect of soil bearing capacity
分类号:
TU416
DOI:
10.3969/j.issn.1001-0505.2020.02.011
摘要:
为了完善考虑土塞效应的开口管桩承载力计算方法,采用孔压静力触探(CPTU)技术与静载试验对崇启大桥北岸接线工程中的预应力高强度混凝土开口管桩(PHC)场地进行了现场测试.基于CPTU测试数据,结合锥尖阻力与桩端阻力的相关性关系,提出了一种开口管桩承载力的CPTU计算新方法.结果表明:当沉桩深度小于15 m时,土塞增长率随桩深增加呈线性下降的趋势.下卧层为硬土层,当沉桩深度由20 m增加到25 m时,土塞增长率从0逐渐增长到10%.管壁环面端阻计算值与CPTU测试结果的比值稳定为0.68.基于所提方法计算的管桩承载力与静载试验结果平均误差仅为4.5%,远低于国内其他规范法的计算结果,计算精度较高,值得在桩基工程中推广使用.
Abstract:
To improve the calculation method for the bearing capacity of open-ended pipe piles considering plugging effect of soil, the field test of the prestressed concrete open-ended pipe pile(PHC)in the Chongqi bridge project was carried out based on the piezocone penetration test(CPTU)technology and static load tests. Based on the CPTU data and the correlation between the cone tip resistance and the pile tip resistance, a new method for CPTU was proposed to calculate the bearing capacity of open-ended pipe piles. The test results show that when the depth in pile sinking is less than 15 m, the growth rate of the plugging effect decreases negatively with the increase of the pile depth. The underlying layer is the hard soil layer. When the depth of pile sinking increases from 20 to 25 m, the growth rate of the plugging effect of soil increases from 0 to 10%. The ratio between the end resistance of the pipe wall and the cone tip resistance measured by CPTU is stable at 0.68. The average error between the bearing capacity of the pipe pile calculated by the proposed method of CPTU and the test results of the static load tests is only 4.5%, which is smaller than the calculation results of other domestic codes. The calculation accuracy is high, so it is worth popularizing in pile foundation engineering.

参考文献/References:

[1] 冯忠居,董芸秀,文军强,等.宁波深厚软基区公路桥梁桩基承载力计算方法[J].天津大学学报(自然科学与工程技术版),2019,52(S1):16-22.
  Feng Z J, Dong Y X, Wen J Q, et al. Method for calculating bearing capacity of bridge pile foundation in Ningbo soil with deep soft base[J].Journal of Tianjin University(Science and Technology), 2019, 52(S1): 16-22.(in Chinese)
[2] 竺明星,卢红前,戴国亮,等.基于侧阻硬化与软化模型的大直径桩基水平承载力研究[J].岩土工程学报,2018,40(S2):132-136. DOI:10.11779/CJGE2018S2027.
Zhu M X, Lu H Q, Dai G L, et al. Lateral bearing capacity of large-diameter pile foundation based on hardening and softening models of side resistance[J].Chinese Journal of Geotechnical Engineering, 2018, 40(S2): 132-136. DOI:10.11779/CJGE2018S2027. (in Chinese)
[3] 杨苏春,张明义,王永洪,等.基于现场试验的闭口静压管桩贯入层状地基桩端阻力研究[J].岩土力学,2018,39(S2):91-99. DOI:10.16285/j.rsm.2018.0961.
Yang S C, Zhang M Y, Wang Y H, et al. Field test on pile tip resistance of closed-end jacked pipe pile penetrating into layered foundation[J].Rock and Soil Mechanics, 2018, 39(S2): 91-99. DOI:10.16285/j.rsm.2018.0961. (in Chinese)
[4] 童立元,李洪江,刘松玉,等.基于静力触探试验的基坑开挖卸荷单桩水平承载力损失预测研究[J].岩土工程学报,2019,41(3):501-508. DOI:10.11779/CJGE201903012.
Tong L Y, Li H J, Liu S Y, et al. Prediction of lateral capacity losses of a single pile adjacent to excavation of foundation pits based on CPT tests[J].Chinese Journal of Geotechnical Engineering, 2019, 41(3): 501-508. DOI:10.11779/CJGE201903012. (in Chinese)
[5] 张诚厚.孔压静力触探应用[M].北京:中国建筑工业出版社,1999:1-10.
[6] Lunne T, Robertson P K, Powell J J M. Cone-penetration testing in geotechnical practice[J].Soil Mechanics and Foundation Engineering, 2009, 46(6): 237. DOI:10.1007/s11204-010-9072-x.
[7] 蔡国军,刘路路,龚申,等.基于CPTU测试的海相软土刚性桩复合地基承载特性研究[J].隧道与地下工程灾害防治,2019(3):46-56.
  Cai G J, Liu L L, Gong S, et al. Bearing characteristics of rigid pile composite foundation in marine soft soil based on CPTU[J].Hazard Control in Tunnelling and Underground Engineering, 2019(3): 46-56.(in Chinese)
[8] 刘晓燕,蔡国军,刘路路,等.南京河漫滩淤泥质粉质黏土导热系数特性及预测模型[J].东南大学学报(自然科学版),2019,49(5):989-995.
  Liu X Y, Cai G J, Liu L L, et al. Thermal conductivity and prediction model of mucky silty clay in Nanjing floodplain[J].Journal of Southeast University(Natural Science Edition), 2019, 49(5): 989-995.(in Chinese)
[9] 李洪江,童立元,刘松玉,等.深处理可液化地层单桩水平承载性状研究[J].中国矿业大学学报,2018,47(4):862-867. DOI:10.13247/j.cnki.jcumt.000896.
Li H J, Tong L Y, Liu S Y, et al. Study of horizontal bearing properties of single piles in deep liquefiable soils after treatment[J].Journal of China University of Mining & Technology, 2018, 47(4): 862-867. DOI:10.13247/j.cnki.jcumt.000896. (in Chinese)
[10] Cai G J, Liu S Y, Puppala A J. Reliability assessment of CPTU-based pile capacity predictions in soft clay deposits[J].Engineering Geology, 2012, 141/142: 84-91. DOI:10.1016/j.enggeo.2012.05.006.
[11] Cai G J, Liu S Y, Tong L Y, et al. Assessment of direct CPT and CPTU methods for predicting the ultimate bearing capacity of single piles[J].Engineering Geology, 2009, 104(3/4): 211-222. DOI:10.1016/j.enggeo.2008.10.010.
[12] 中华人民共和国住房和城乡建设部.JGJ94—2008建筑桩基设计规范[S].北京:中国建筑工业出版社,2008.
[13] 上海市城乡建设和交通委员会.DGJ08-11—1999上海市地基基础设计规范[S].上海:同济大学出版社,1999.
[14] 中国工程建设标准化委员会.TBJ 37—93静力触探规则[S].北京:中国铁道出版社,1993.
[15] Almeida M S, Danziger F A, Lunne T. Use of the piezocone test to predict the axial capacity of driven and jacked piles in clay[J].Canadian Geotechnical Journal, 1996, 33(1): 23-41. DOI:10.1139/t96-022.
[16] Eslami A, Fellenius B H. Pile capacity by direct CPT and CPTU methods applied to 102 case histories[J].Canadian Geotechnical Journal, 1997, 34(6): 886-904. DOI:10.1139/t97-056.
[17] Kordjazi A, Pooya Nejad F, Jaksa M B. Prediction of ultimate axial load-carrying capacity of piles using a support vector machine based on CPT data[J].Computers and Geotechnics, 2014, 55: 91-102. DOI:10.1016/j.compgeo.2013.08.001.
[18] Randolph M F, Steenfeld J S, Wroth P. The effect of pile type on design parameters for driven piles[M].Cambridge: Cambridge University, 1979: 121-146.
[19] Nauroy J F, Le Tirant P. Model tests of piles in Calcarecus sands[C]//Geotechnical Practice in Offshore Engineering. Washington, DC, USA:ASCE, 1983: 356-369.
[20] Paikowsky S G, Whitman R V, Baligh M M. A new look at the phenomenon of offshore pile plugging[J].Marine Geotechnology, 1989, 8(3): 213-230. DOI:10.1080/10641198909379869.
[21] 刘俊伟.静压开口混凝土管桩施工效应试验及理论研究[D].杭州:浙江大学,2012.
  Liu J W.Experimental and theoretical studies on the construction effects for jacked open-ended concrete pipe piles[D]. Hangzhou: Zhejiang University, 2012.(in Chinese)
[22] Smith I M, To P, Wilson S M. Plugging of pipe piles[C]//Proceeding of 3rd International Conference on Numerical Methods in Offshore Piling. Paris,France,1986: 53-73.
[23] Randolph M F, Leong E C, Houlsby G T. One-dimensional analysis of soil plugs in pipe piles[J]. Géotechnique, 1991, 41(4): 587-598. DOI:10.1680/geot.1991.41.4.587.
[24] Lehane B M, Gavin K G. Base resistance of jacked pipe piles in sand[J].Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127(6): 473-480. DOI:10.1061/(asce)1090-0241(2001)127:6(473).
[25] Doherty P, Gavin K, Gallagher D. Field investigation of base resistance of pipe piles in clay[J].Proceedings of the Institution of Civil Engineers-Geotechnical Engineering, 2010, 163(1): 13-22. DOI:10.1680/geng.2010.163.1.13.
[26] Lehane B M, Schneider J A, Xu X. The UWA-05 method for prediction of axial capacity of driven piles in sand[C]//Proceedings of the 1st International Symposium on Frontiers in Offshore Geotechnics. Perth, Australia, 2005: 683-689.

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备注/Memo

备注/Memo:
收稿日期: 2019-09-22.
作者简介: 刘路路(1990—),男,博士生;蔡国军(联系人),男,博士,教授,博士生导师,focuscai@163.com.
基金项目: 国家重点研发计划资助项目(2016YFC0800200)、国家自然科学基金资助项目(41672294、41877231)、江苏省研究生科研创新计划资助项目(KYCX19-0098)、东南大学优秀博士学位论文培育基金资助项目(YBPY1926).
引用本文: 刘路路,蔡国军,耿功巧,等.考虑土塞效应的开口管桩承载力CPTU计算方法[J].东南大学学报(自然科学版),2020,50(2):280-285. DOI:10.3969/j.issn.1001-0505.2020.02.011.
更新日期/Last Update: 2020-03-20