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砂土地基含水率的不同对管桩的沉桩特性有着较大影响。通过室内模型试验的方式，控制砂土地基含水率，对双壁开口管桩进行静压沉桩试验。沉桩过程中采集沉桩阻力、桩身应变与土塞变化。研究发现非饱和砂土地基的沉桩阻力较小，约为干砂与饱和砂土地基沉桩阻力的66.88%和80.78%；随着沉桩贯入，外管单位侧摩阻力沿桩身不断增大，同一深度处出现衰退现象，非饱和砂土地基的衰退现象更明显，含水率的不同对单位侧摩阻力的影响较大；非饱和砂土由于其含水率所导致的流动性，更容易形成土塞，土塞高度高、形成快，并且沉桩入土较深时土塞增长趋势要高于干砂与饱和砂土地基。
Abstract：The water content of the sandy soil foundation has a significant impact on the pile driving characteristics of pipe piles.Through laboratory model tests,this study controlled the water content of the sandy soil foundation and conducted static pressure pile driving tests on double-walled open-ended pipe piles.During the pile driving process,the resistance,strain on the pile shaft and soil plugging were measured.It was found that the resistance to pile driving in unsaturated sand soil foundation is relatively low,approximately 66.88%and80.78%of that in dry sand and saturated sandy soil foundation.As the pile is driven into the foundation,the lateral friction resistance per unit area along the outer pile shaft increases continuously,but a decay phenomenon occurs at the same depth,which is more pronounced in unsaturated sandy soil foundation.The difference in water content has a significant effect on lateral friction resistance per unit area.Due to the fluidity imparted by the water content of unsaturated sandy soil foundation,soil plugs are more easily formed,resulting in higher and faster-forming plugs.Additionally,the trend of soil plug growth is faster in deeper pile driving conditions than that in dry sand and saturated sandy soil foundation.
[1]杨校辉，朱彦鹏，黄雪峰．静压桩荷载传递与承载性状试验研究[J]．水利与建筑工程学报，2016,14(1):139-143.YANG Xiaohui,ZHU Yanpeng,HUANG Xuefeng.Experimental research on loading transfer and bearing characteristics of a jacked pile[J].Journal of Water Resources and Architectural Engineering,2016,14(1):139-143.
[2]刘俊伟，王立忠，朱娜，等．开口管桩贯入特性的大尺度模型试验[J]．工程科学学报，2019,41(2):269-277.LIU Junwei,WANG Lizhong,ZHU Na,et al.Large-scale model test on installation characteristics of open-ended pipe pile[J].Chinese Journal of Engineering,2019,41(2):269-277.
[3]王永洪，张明义，白晓宇，等．基于光纤光栅传感技术的静压沉桩贯入特性及影响因素研究[J]．岩土力学，2019,40(12):4801-4812.WANG Yonghong,ZHANG Mingyi,BAI Xiaoyu,et al.Study of penetration characteristics and influence factor of jacked pile based on fiber bragg grating sensing technology[J].Rock and Soil Mechanics,2019,40(12):4801-4812.
[4]王永洪，金珈民，袁继奎，等．基于桩侧摩阻力退化静压桩沉桩效应室内试验[J]．沈阳建筑大学学报（自然科学版），2024,40(6):1021-1028.WANG Yonghong,JiN Jiamin,YUAN Jikui,et al.Experimental study ofpile jacking effeet based on pile side friction resistance degradation[J].Joumal of Shenyang Jianzhu University(Natural Science),2024,40(6):1021-1028.
[5]王跃，孙艺宁，张延新，等．考虑土塞效应的静压沉桩力学分析[J]．建筑结构，2021,51(S2):1684-1690.WANG Yue,SUN Yining,ZHANG Yanxin,et al.Mechanical analysis of static pressure pile driving considering soul plug effect[J].Building Structure,2021,51(S2):1684-1690.
[6]肖昭然，王艳林，赵宪强，等．砂土地基中静压桩沉桩及其承载特性室内试验研究[J]．建筑结构学报，2022,43(11):294-302.XIAO Zhaoran,WANG Yanlin,ZHAO Xianqiang,et al.Experimental investigation on resistance and response of jacked model piles in sand[J].Journal of Building Structures,2022,43(11):294-302.
[7]BRUCY F,MEUNIER J,NAUROY J F.Behavior of pile plug in sandy soils during and after driving[C]//23rd Annual Offshore Technology Conference.Houston:Offshore Technology Conference,1991:145-154.
[8]张思峰，任国彰，刘乾，等．管桩土塞效应影响因素及承载性能试验研究[J]．公路，2022,67(10):75-82.ZHANG Sifeng,REN Guozhang,LIU Qian,et al.Research on influence factors of soil plug effect and bearing capacity of pipe pile[J].Highway,2022,67(10):75-82.
[9]李立辰，刘卓，刘浩，等．考虑土塞效应的开口管桩沉桩与承载全过程离散元分析[J]．岩土工程学报，2024,46(7):1471-1480.LI Lichen,LIU Zhuo,LIU Hao,et al.DEM analysis of installation and bearing process of open-ended piles considering plugging effects[J].Chinese Journal of Geotechnical Engineering,2024,46(7):1471-1480.
[10]管金萍，张明义，王永洪，等．双壁静压开口管桩贯入及承载特性试验研究[J]．科学技术与工程，2020,20(12):4838-4845.GUAN Jinping,ZHANG Mingyi,WANG Yonghong,et al.Experimental study on penetration and bearing characteristics of doublewalled static pressure open tubular pile[J].Science Technology and Engineering,2020,20(12):4838-4845.
[11]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):1409-1414.LI Yunong,LI Jingpei,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):1409-1414.
[12]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):1564-1568.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):1564-1568.
[13]于洪川，代楠，陈逸飞，等．开口与闭口管桩连续贯入机理的可视化模型试验研究[J]．科学技术与工程，2023,23(15):6573-6580.YU Hongchuan,DAI Nan,CHEN Yifei,et al.Visual model experimental study on penetration behaviour of open-ended and closedended pipe piles[J].Science Technology and Engineering,2023,23(15):6573-6580.
[14]黄院雄，许清侠，胡中雄．饱和土中打桩引起桩周围土体的位移[J]．工业建筑，2000(7):15-19.HUANG Yuanxiong,XU Qingxia,HU Zhongxiong.Soil’s displacement due to driving pile in saturated clay[J].Industrial Construction,2000(7):15-19.
[15]FINLAY T C R,WHITE D J,BOLTON M D,et al.Press-in-piling:The installation of instrumented steel tubular piles with and without driving shoes[C]//5th International Conference on Deep Foundation Practice.Singapore:CRC Press Taylor&Francis Group,2009:199-208.
[16]IGOE D,GAVIN K G,O’KELLY B C.Shaft capacity of open-ended piles in sand[J].Journal of Geotechnical and Geoenvironmental Engineering,2011,137(10):903-913.
[17]GB/T 50123—2019，土工试验方法标准[S].GB/T 50123—2019,Standard for geotechnical testing method[S].
[18]朱斌，熊根，刘晋超，等．砂土中大直径单桩水平受荷离心模型试验[J]．岩土工程学报，2013,35(10):1807-1815.ZHU Bin,XIONG Gen,LIU Jinchao,et al.Centrifuge modelling of a large-diameter single pile under lateral loads in sand[J].Chinese Journal of Geotechnical Engineering,2013,35(10):1807-1815.
[19]朱娜．开口管桩贯入特性大尺度模型试验与离散元模拟[D]．青岛：青岛理工大学，2018.ZHU Na.Large scale model test of open pipe pile penetration characteristics and discrete element simulation[D].Qingdao:Qingdao University of Technology,2018.
基本信息:
DOI：
中图分类号:TU473.1
引用信息:
[1]王伟丞,远航,丁钰星,等.砂土地基含水率对静压开口管桩沉桩特性的影响[J].青岛理工大学学报,2025,46(06):37-46.
基金信息:
国家自然科学基金（42277135）; 山东省优秀青年基金（ZR2021YQ31）