工程科学学报，第41卷，第2期：269-277,2019年2月 Chinese Joural of Engineering,Vol.41,No.2:269-277,February 2019 DOI:10.13374/j.issn2095-9389.2019.02.015;http://journals.ustb.edu.cn 开口管桩贯入特性的大尺度模型试验 刘俊伟123)，王立忠)，朱娜)，张春巍)四，赵国晓) 1)青岛理工大学土木工程学院，青岛2660332)青岛理工大学蓝色经济区工程建设与安全协同创新中心，青岛266033 3)浙江大学建筑工程学院，杭州310058 ☒通信作者，E-mail:zhangchunwei(@qut.cd山.cn 摘要开口管桩由于其承载力高、质量可靠、施工方便等优点得到越来越广泛的应用.土塞的生成使得开口管桩沉桩阻力 不同于闭口管桩，不仅包括桩外侧摩阻力、桩端阻力，桩内侧摩阻力亦是其重要组成部分.针对开口管桩沉桩受力特性，采用 自主研发的大尺度模型试验装置，进行不同桩靴形式下开口管桩的贯入试验，并与闭口管桩进行对比分析.研究表明，开口管 桩随沉桩深度的增加趋于闭塞，沉桩阻力随沉桩过程基本呈线性增加，桩内、外侧单位摩阻力均存在“侧阻退化”效应：桩体贯 入时桩周地表隆起量随径向距离增加逐渐减小，隆起速率随沉桩深度增加逐渐变缓，桩周土影响范围约为5~7倍桩径：桩靴 对开口管桩土塞生成、沉桩阻力和挤土效应均有重要影响，内30°桩靴土塞生成高度、桩内侧摩阻力及其所占总沉桩阻力比例 最大，桩周土地表隆起量最小，外30°桩靴与内30°桩靴情况相反，直角桩靴居中：闭口管桩沉桩阻力、外侧摩阻力与挤土程度 均大于开口管桩 关键词开口管桩：室内试验；贯入特性；不同桩靴：土塞 分类号TU473.1 Large-scale model test on installation characteristics of open-ended pipe pile LIU Jun-wei),WANG Li-zhong?),ZHU Na,ZHANG Chun-wei),ZHAO Guo-xiao) 1)School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China 2)Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone,Qingdao University of Technology,Qingdao 266033,China 3)College of Civil Engineering and Architecture,Zhejiang University.Hangzhou 310058,China Corresponding author,E-mail:zhangchunwei@qut.edu.cn ABSTRACT The open pipe pile is widely used because of its high bearing capacity,reliable quality,and convenient construction. The formation of the soil plug makes the total resistance of the open pipe pile different from that of the closed pipe pile.The bearing ca- pacity of the open pipe pile includes three parts:the exteral friction of the pile,the pile end resistance,and the pile inside the fric- tion.According to the stress characteristics of open pipe piles during installation,a self-developed large-scale laboratory test apparatus was used to test the penetration of open pipe piles under different forms of pile boots,and based on the results,the open pipe pile was compared with closed pipe pile.The results show that the open pipe pile tends to be occluded with the increase of pile depth.The re- sistance of pile increases linearly with the pile sinking process,while the frictional resistance inside and outside the pile has"lateral degeneration effect."The influence range of surface displacement decreases with the increase of radial distance.The uplift rate gradu- ally reduced with the increasing depth of pile sinking.The influence range of soil around pile is about 5 to 7 times of pile diameter.The pile shoe affects the height of the soil plug,pile resistance distribution,internal and external frictional resistance,and the effect of 收稿日期：2018-04-02 基金项目：国家自然科学基金资助项目(41772318，)：中国博士后科学基金资助项目(2015M581940):山东省重点研发计划资助项目 (2017GSF20107):青岛市应用基础研究资助项目(16-5-1-34-jh):住房和城乡建设部科学技术计划资助项目(2014-K3-026):泰山学者工程 专项经费资助项目（鲁政办字〔2015]212号）工程科学学报,第 41 卷,第 2 期:269鄄鄄277,2019 年 2 月 Chinese Journal of Engineering, Vol. 41, No. 2: 269鄄鄄277, February 2019 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2019. 02. 015; http: / / journals. ustb. edu. cn 开口管桩贯入特性的大尺度模型试验 刘俊伟1,2,3) , 王立忠3) , 朱 娜1) , 张春巍1) 苣 , 赵国晓1) 1) 青岛理工大学土木工程学院, 青岛 266033 2) 青岛理工大学蓝色经济区工程建设与安全协同创新中心, 青岛 266033 3) 浙江大学建筑工程学院, 杭州 310058 苣通信作者, E鄄mail: zhangchunwei@ qut. edu. cn 摘 要 开口管桩由于其承载力高、质量可靠、施工方便等优点得到越来越广泛的应用. 土塞的生成使得开口管桩沉桩阻力 不同于闭口管桩,不仅包括桩外侧摩阻力、桩端阻力,桩内侧摩阻力亦是其重要组成部分. 针对开口管桩沉桩受力特性,采用 自主研发的大尺度模型试验装置,进行不同桩靴形式下开口管桩的贯入试验,并与闭口管桩进行对比分析. 研究表明,开口管 桩随沉桩深度的增加趋于闭塞,沉桩阻力随沉桩过程基本呈线性增加,桩内、外侧单位摩阻力均存在“侧阻退化冶效应;桩体贯 入时桩周地表隆起量随径向距离增加逐渐减小,隆起速率随沉桩深度增加逐渐变缓,桩周土影响范围约为 5 ~ 7 倍桩径;桩靴 对开口管桩土塞生成、沉桩阻力和挤土效应均有重要影响,内 30毅桩靴土塞生成高度、桩内侧摩阻力及其所占总沉桩阻力比例 最大,桩周土地表隆起量最小,外 30毅桩靴与内 30毅桩靴情况相反,直角桩靴居中;闭口管桩沉桩阻力、外侧摩阻力与挤土程度 均大于开口管桩. 关键词 开口管桩; 室内试验; 贯入特性; 不同桩靴; 土塞 分类号 TU473郾 1 收稿日期: 2018鄄鄄04鄄鄄02 基金项目: 国家自然科学基金资助项目( 41772318,);中国博士后科学基金资助项目( 2015M581940 );山东省重点研发计划资助项目 (2017GSF20107);青岛市应用基础研究资助项目(16鄄鄄5鄄鄄1鄄鄄34鄄鄄jch);住房和城乡建设部科学技术计划资助项目(2014鄄鄄K3鄄鄄026);泰山学者工程 专项经费资助项目(鲁政办字也2015页212 号) Large鄄scale model test on installation characteristics of open鄄ended pipe pile LIU Jun鄄wei 1,2,3) , WANG Li鄄zhong 3) , ZHU Na 1) , ZHANG Chun鄄wei 1) 苣 , ZHAO Guo鄄xiao 1) 1) School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China 2) Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao 266033, China 3) College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China 苣Corresponding author, E鄄mail: zhangchunwei@ qut. edu. cn ABSTRACT The open pipe pile is widely used because of its high bearing capacity, reliable quality, and convenient construction. The formation of the soil plug makes the total resistance of the open pipe pile different from that of the closed pipe pile. The bearing ca鄄 pacity of the open pipe pile includes three parts: the external friction of the pile, the pile end resistance, and the pile inside the fric鄄 tion. According to the stress characteristics of open pipe piles during installation, a self鄄developed large鄄scale laboratory test apparatus was used to test the penetration of open pipe piles under different forms of pile boots, and based on the results, the open pipe pile was compared with closed pipe pile. The results show that the open pipe pile tends to be occluded with the increase of pile depth. The re鄄 sistance of pile increases linearly with the pile sinking process, while the frictional resistance inside and outside the pile has “ lateral degeneration effect. 冶 The influence range of surface displacement decreases with the increase of radial distance. The uplift rate gradu鄄 ally reduced with the increasing depth of pile sinking. The influence range of soil around pile is about 5 to 7 times of pile diameter. The pile shoe affects the height of the soil plug, pile resistance distribution, internal and external frictional resistance, and the effect of