层状黏性土中静压桩沉贯特性现场试验

doi:10.13722/j.cnki.jrme.2021.1246

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摘要为探讨层状黏性土中静压桩的沉贯特性，依托山东东营某桩基工程开展了现场静压桩足尺试验，分析开闭口静压桩压桩力的变化规律，明确开闭口静压桩桩端阻力和桩侧摩阻力在贯入过程中的分布形式，揭示桩土界面径向土压力和孔隙水压力的分布特征以及有效径向土压力对单位桩侧摩阻力的影响机制。试验结果表明：压桩力的变化规律基本反映了土层性质的变化，土层的软硬程度制约着压桩力的变化，开口桩压桩力明显小于闭口桩压桩力，沉桩结束时开口桩占闭口桩的33.9%～79.7%；土层的软硬程度对桩端阻力的影响较大，并且闭口桩对桩端土层软硬程度的敏感性高于开口桩；桩侧摩阻力的发挥与土层的性质密切相关，受到土层变化的原因桩侧摩阻力临近深度并不明显，并且单位桩侧摩阻力出现明显的退化现象；桩土界面桩侧土压力的增长幅度与土层性质密切相关；孔隙水压力和超孔隙水压力的分布形式与土层的渗透性有关，基于水力压裂理论结合圆柱孔扩张理论推导的超孔隙水压力计算公式能较好地反映超孔隙水压力的分布特征；粉土层中有效径向土压力与单位桩侧摩阻力的比值为0.28左右，在粉质黏土层的比值为0.3，桩侧摩阻力的退化实质上是桩侧有效径向土压力的退化。

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	桑松魁1
	2
	白晓宇2
	3
	孔亮1
	2
	王永洪2
	3
	张明义2
	3

关键词 ：桩基础, 静压桩, 现场试验, 开闭口桩, 桩侧摩阻力, 桩土界面, 超孔隙水压力, 有效径向土压力

Abstract：In order to investigate the penetration characteristics of jacked piles in layered clay，in-situ full-scale tests of hydrostatic piles were carried out based on a pile foundation project in Dongying，Shandong Province. The variation law of the jacking force of open and closed jacked piles is analyzed，and the distribution form of the end resistance and the shift resistance of open and closed jacked piles during jacking is discussed. The distribution characteristics of the radial soil pressure and the pore water pressure at the pile-soil interface are revealed. The influence mechanism of the effective radial earth pressure on unit shaft resistances is also revealed. The test results show that the change of the jacking force basically reflects the change of soil properties，and the soft and hard degree of soil restricts the change of the jacking force. The jacking force of open piles is obviously less than that of closed piles，and the open pile accounts for 33.9%–79.7% of the closed pile at the end of jacking. The soft and hard degree of soil layers has a great influence on the pile end resistance，and the sensitivity of closed piles to the soft and hard degree of soil layer is higher than that of open piles. The development of the shaft resistances is closely related to the properties of soil layer. The shaft resistance caused by soil layer change is not obvious near the depth，and the unit shaft resistance appears obvious degradation. The increase of the soil pressure at the pile-soil interface is closely related to soil properties. The distribution forms of the pore water pressure and the excess pore water pressure are related to the permeability of soil layer. The calculation formula of the excess pore water pressure based on hydraulic fracturing theory and cylindrical pore expansion theory can better reflect the distribution characteristics of the excess pore water pressure. The ratio of the effective radial earth pressure to the unit shaft resistance is about 0.28 in silty soil layer，and 0.3 in silty clay layer. The degradation shaft resistance actually reflects the degradation of the effective radial earth pressure.

Key words： pile foundation jacked pile field test open and closed piles shaft resistances pile-soil interface excess pore water pressure effective radial earth pressure

引用本文:

桑松魁1，2，白晓宇2，3，孔亮1，2，王永洪2，3，张明义2，3. 层状黏性土中静压桩沉贯特性现场试验[J]. 岩石力学与工程学报, 2022, 41(10): 2135-2148.
SANG Songkui1，2，BAI Xiaoyu2，3，KONG Liang1，2，WANG Yonghong2，3，ZHANG Mingyi2，3. Field test of penetration characteristics of jacked piles in layered clay. , 2022, 41(10): 2135-2148.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1246 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I10/2135

[8]	张明义，邓安福. 预制桩静力贯入层状地基的试验研究[J]. 岩土工程学报，2000，22(4)：490–492.(ZHANG Mingyi，DENG An?fu. Experimental study on jacked precast piles in layered soil[J]. Chinese Journal of Geotechnical Engineering，2000，22(4)：490–492.(in Chinese))
[28]	ALTAEE A，FELLENIUS B H，EVGIN E. Load transfer for piles in sand and the critical depth[J]. Canadian Geotechnical Journal，1993，30：455–463.
[17]	李雨浓，BARRY M L，刘清秉. 黏土中静压沉桩离心模型[J]. 工程科学学报，2018，40(3)：285–292.(LI Yunong，BARRY M L，LIU Bingqing. Centrifuge modeling of jacked pile in clay[J]. Chinese Journal of Engineering，2018，40(3)：285–292.(in Chinese))
[20]	RANDOLPIH M F. Science and empiricism in pile foundation design[J]. Geotechnique，2003，53(10)：847–875.
[3]	曹兆虎，孔纲强，刘汉龙，等. 基于透明土的管桩贯入特性模型试验研究[J]. 岩土工程学报，2014，36(8)：1 564–1 568.(CAO Zhaohu，KONG Gangqiang，LIU Hanlong，et al. Model tests on pipe pile penetration by using transparent soils[J]. Chinese Journal of Geotechnical Engineering，2014，36(8)：1 564–1 568.(in Chinese))
[6]	张忠苗，刘俊伟，俞峰，等. 静压预应力混凝土管桩土塞效应试验研究[J]. 岩土力学，2011，32(8)：2 274–2 280.(ZHANG Zhongmiao，LIU Junwei，YU Feng，et al. Research on plugging effect of jacked prestressed concrete pipe pile[J]. Rock and Soil Mechanics，2011，32(8)：2 274–2 280.(in Chinese))
[13]	周健，邓益兵，叶建忠，等. 砂土中静压桩沉桩过程试验研究与颗粒流模拟[J]. 岩土工程学报，2009，31(4)：501–507.(ZHOU Jian，DENG Yibing，YE Jianzhong，et al. Experimental and numerical analysis of jacked piles during installation in sand[J]. Chinese Journal of Geotechnical Engineering，2009，31(4)：501–507.(in Chinese))
[16]	肖昭然，王艳林，赵宪强，等. 砂土地基中静压沉桩阻力及响应特性室内试验研究[J]. 建筑结构学报，2021，DOI：10.14006/j.jzjgxb.2022.0793.(XIAO Zhaoran，WANG Yanlin，ZHAO Xianqing，et al. Experimental investigation of the resistance and response of jacked model piles in sand[J]. Journal of Building Structures，2021，DOI：10.14006/j.jzjgxb.2022.0793.(in Chinese))
[4]	李镜培，方睿，李林. 考虑土体三维强度特性的静压桩周超孔压解析及演变[J]. 岩石力学与工程学报，2016，35(4)：847–855.(LI Jingpei，FANG Rui，LI Lin. Variation of excess pore pressure around jacked piles considering the three-dimensional strength of soil[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(4)：847–855.(in Chinese))
[14]	周健，李魁星，郭建军，等. 分层介质中桩端刺入的室内模型试验及颗粒流数值模拟[J]. 岩石力学与工程学报，2012，31(2)：375–381.(ZHOU Jian，LI Kuixing，GUO Jianjun，et al. Laboratory model tests and particle flow cade numerical simulation of pile tip penetration in layered medium[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(2)：375–381.(in Chinese))
[23]	李林，李镜培，龚卫兵，等. K0固结天然饱和黏土中柱孔扩张弹塑性解[J]. 哈尔滨工业大学学报，2017，49(6)：90–95.(LI Lin，LI Jingpei，GONG Weibing，et al. Elasto-plastic solution to expansion of a cylindrical cavity in K0-consolidated natural saturated clay[J]. Journal of Harbin Institute of Technology，2017，49(6)：90–95.(in Chinese))
[24]	BOND A J，JARDINE R J. Shaft capacity of displacement piles in high OCR clay[J]. Geotechnique，1995，45(1)：3–23.
[26]	李雨浓，李镜培，赵仲芳，等. 层状地基静压桩贯入过程机理试验[J]. 吉林大学学报：地球科学版，2010，40(6)：1 409–1 414.(LI Yunong，LI Jinpei，ZHAO Zhongfang，et al. Model test research on penetration process of jacked pile in layered soil[J]. Journal of Jilin University：Earth Science Edition，2010，40(6)：1 409–1 414.(in Chinese))
[33]	王育兴，孙钧. 打桩施工对周围土性及孔隙水压力的影响[J]. 岩石力学与工程学报，2004，23(1)：153–158.(WANG Yuxing，SUN Jun. Influence of pile driving on properties of soils around pile and pore water pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(1)：153–158.(in Chinese))
[34]	MEYERHOF G G. Bearing capacity and settlement of pile foundations[J]. Journal of the Geotechnical Engineering Division，ASCE，1976，102(3)：195–228.
[2]	李林，李镜培，孙德安，等. 考虑天然黏土应力各向异性的静压沉桩效应研究[J]. 岩石力学与工程学报，2016，35(5)：1 055–1 064. (LI Lin，LI Jingpei，SUN De?an，et al. Pile jacking-in effects considering stress anisotropy of natural clay[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(5)：1 055–1 064.(in Chinese))
[5]	寇海磊，张明义. 基于桩身应力测试的静压PHC管桩贯入机制[J]. 岩土力学，2014，35(5)：1 295–1 302.(KOU Hailei，ZHANG Mingyi. Penetration mechanism of jacked PHC pipe piles based on pile stress measurement[J]. Rock and Soil Mechanics，2014，35(5)：1 295–1 302. (in Chinese))
[7]	胡永强，汤连生，黎志中. 端承型静压桩沉桩贯入过程中桩侧阻力变化规律及其时效性试验研究[J]. 中山大学学报：自然科学版，2015，54(1)：130–135.(HU Yongqiang，TANG Liansheng，LI Zhizhong. Experimental study on variation and time effect of shaft resistance of jacked pile installation[J]. Journal of Sun Yat-sen University：Natural Science Edition，2015，54(1)：130–135.(in Chinese))
[10]	张忠苗，谢志专，刘俊伟，等. 淤质与粉质互层土中管桩沉桩过程的土压力[J]. 浙江大学学报：工学版，2011，45(8)：1 430–1 434. (ZHANG Zhongmiao，XIE Zhizhuan，LIU Junwei，et al. The earth pressure during pile driving in silty soil with mucky soil interbed[J]. Journal of Zhejiang University：Engeering Science，2011，45(8)：1 430–1434.(in Chinese))
[12]	唐世栋，何连生，叶真华. 软土地基中桩基施工引起的侧向土压力增量[J]. 岩土工程学报，2002，24(6)：752–755.(TANG Shidong，HE Liansheng，YE Zhenhua. Increment of lateral pressure caused by installation of pile in soft foundation[J]. Chinese Journal of Geotechnical Engineering，2002，24(6)：752–755.(in Chinese))
[15]	TEHRANI F S，HAN F，SALGADO R，et al. Effect of surface roughness on the shaft resistance of non-displacement piles embedded in sand[J]. Geotechnique，2016，66(5)：386–400.
[22]	李林，李镜培，孙德安，等. 考虑天然黏土应力各向异性的静压沉桩效应研究[J]. 岩石力学与工程学报，2016，35(5)：1 055–1 064. (LI Lin，LI Jingpei，SUN De?an，et al. Pile jacking-in effects considering stress anisotropy of natural clay[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(5)：1 055–1 064.(in Chinese))
[18]	李雨浓，LEHANE B M. 双层高岭黏土中沉桩特性模型试验[J]. 吉林大学学报：地球科学版，2018，48(6)：1 778–1 784.(LI Yunong，LEHANE B M. Later stress for model jacked piles in two-layered kaolin clay[J]. Journal of Jilin University：Earth Science，2018，48(6)：1 778–1 784.(in Chinese))
[25]	张明义. 静力压入桩的研究与应用[M]. 北京：中国建材工业出版社，2004：37–38.(ZHANG Mingyi. Research and application on the jacked piles[M]. Beijing：China Building Material Industry Press，2004：37–38.(in Chinese))
[30]	NEELY W J. Bearing capacity of expanded-base piles in sand[J]. Journal of the Geotechnical Engineering Division，ASCE，1990，116(1)：73–87.
[32]	朱向荣，何耀辉，徐崇峰，等. 饱和软土单桩沉桩超孔隙水压力分析[J]. 岩石力学与工程学报，2005，24(增2)：5 740–5 744.(ZHU Xiangrong，HE Yaohui，XU Chongfeng，et al. Excess pore water pressure caused by single pile driving on saturated soft soil[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(Supp.2)：5 740–5 744.(in Chinese))
[1]	TEHRANI F S，HAN F，SALGADO R，et al. Effect of surface roughness on the shaft resistance of non-displacement piles embedded in sand[J]. Géotechnique，2016，66(5)：386–400.
[9]	胡永强，汤连生，李兆源. 静压桩桩–土界面滑动摩擦机制研究[J]. 岩土力学，2015，36(5)：1 288–1 294.(HU Yongqiang，TANG Liansheng，LI Zhaoyuan. Mechanism of sliding friction at pile-soil interface of jacked pile[J]. Rock and Soil Mechanics，2015，36(5)：1 288–1 294.(in Chinese))
[11]	张忠苗，谢志专，刘俊伟，等. 粉土与淤质互层土中管桩压入过程孔隙水压力试验研究[J]. 岩土工程学报，2010，32(增2)：533–536.(ZHANG Zhongmiao，XIE Zhizhuan，LIU Junwei，et al. Experimental study on pore pressure during pile driving in silty soil with mucky soil interbed[J]. Chinese Journal of Geotechnical Engineering，2010，32(Supp.2)：533–536.(in Chinese))
[19]	张亚国，李镜培. 静压沉桩引起的土体应力与孔压分布特征[J]. 上海交通大学学报，2018，52(12)：1 587–1 593.(ZHANG Yaguo，LI Jingpei. Distribution characteristics of stress and pore pressure induced by pile jacking[J]. Journal of Shanghai Jiao Tong University，2018，52(12)：1 587–1 593.(in Chinese))
[21]	李镜培，操小兵，李林，等. 静压沉桩与CPTU贯入离心模型试验及机制研究[J]. 岩土力学，2018，39(12)：4 305–4 312.(LI Jingpei，CAO Xiaobing，LI Lin，et al. Centrifugal model test and mechanism study of jacked pile and CPTU penetration[J]. Rock and Soil Mechanics，2018，39(12)：4 305–4 312.(in Chinese))
[29]	COYLE H M，CASTELLO R R. New design correlations for piles in sand[J]. Journal of the Geotechnical Engineering Division，ASCE，1982，108 (GT11)：1 519–1 520.
[31]	唐世栋，何连生，傅纵. 软土地基中单桩施工引起的超孔隙水压力[J]. 岩土力学，2002，23(6)：725–729.(TANG Shidong，HE Liansheng，FU Zong. Excess pore water pressure caused by an installing pile in soft foundation[J]. Rock and Soil Mechanics，2002，23(6)：725–729.(in Chinese))
[27]	KRAFT L M J. Performance of axially loaded pipe piles in sand[J]. Journal of the Geotechnical Engineering Division，ASCE，1991，117(2)：272–296.