锥形帽单桩竖向承载力模型试验研究  

Model test study on vertical bearing capacity of single conical cap piles

作　　者：邓友生[1,2] 宋虔 张克钦 李文杰 马二立 吴阿龙 Deng Yousheng;Song Qian;Zhang Keqin;Li Wenjie;Ma Erli;Wu Along(School of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Pile-supported Structures Research and Test Center,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]西安科技大学桩承结构研究中心,陕西西安710054

出　　处：《武汉科技大学学报》2023年第6期472-477,共6页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金项目(51878554,41672308);陕西省自然科学基础研究计划重点项目(2018JZ5012)。

摘　　要：利用等截面桩、方形帽桩和锥形帽桩3种单桩室内模型对比试验研究了锥形帽桩的竖向承载能力,重点分析其桩顶荷载-沉降曲线、桩身轴力分布规律、桩侧摩阻力曲线和荷载分担比。结果表明,锥形帽桩的极限承载力最大,相较于等截面桩和方形帽桩,锥形帽桩极限承载力分别提高了40.0%和16.7%;且锥形帽单桩的轴力分布更加均衡,其侧摩阻力呈先增大后减小再增加的趋势;桩顶锥形桩帽的设置能改善桩体受力状态,减小负摩阻力影响,提高材料利用率;试验中锥形帽单桩的桩侧阻力占总承载力的比例约63.8%,相比等截面桩与方形帽桩相应值分别增加了128.3%和59.4%,其侧摩阻力在三种桩型中为最大,整体表现为摩擦桩。The vertical load bearing capacity of conical cap piles was investigated by using three types of monopile laboratory model comparative tests,namely,equal section piles,square cap piles and conical cap piles,with emphasis on analysing the top load-settlement curves,the axial force distribution patterns,the lateral resistance curves and the load sharing ratios.The results show that the ultimate bearing capacity of conical cap piles is 40.0%and 16.7%higher than that of equal cross-section piles and square cap piles,respectively.The axial force distribution of conical cap monopiles is more ba-lanced,and their lateral friction resistance shows a tendency of increasing firstly and then decreasing and then increasing again.The setup of conical cap at the top of the pile can improve the pile bearing state,reduce negative friction resistance,and improve the material utilisation rate.In the test,the lateral resistance of conical cap single piles accounts for 63.8%of the total bearing capacity,which has increased by 128.3%and 59.4%respectively when compared with equal section piles and square cap piles.The lateral friction resistance of conical cap single piles is the largest among the three types of piles,and that with the best overall performance is the friction pile.

关 键 词：锥形帽单桩 模型试验 竖向承载力 桩身轴力 侧摩阻力 

分 类 号：TU473.1[建筑科学—结构工程]