（1 浙江工业大学建工学院，杭州 310014； 2 浙江工业大学建筑规划设计研究院，杭州 310014）
［摘要］通过室内模型试验和现场试验与等直径桩进行对比，并在工程中试用，对扩底管桩的承载性状和扩大头的形成情况进行了研究和探讨。发现管桩经静压混凝土扩底后扩大头为近似椭球体，扩底管桩比普通封底管桩承载力提高显著，桩端土挤密作用明显，桩端土压力影响范围广。工程试用结果证明该桩型具有承载力高、沉降小、经济环保等特点。
［关键词］扩底管桩；静压法；试验；承载力
Experiment research and  application of expanded-foot tubular pile
Ding Cuihong1， Gong Feng1， Ying Yimiao2(1 College of Architecture and Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2 Architectural and Planning Design and Research Institute of Zhejiang University of Technology, Hangzhou 310014, China)
Abstract:In order to research the bearing characteristic of the expanded-foot tubular pile for future design and construction, laboratory model experiment, in-site test and engineering practice are carried out. The shape of foot is also studied. It is found that by statically driving some concret into tubular pile bottom，the shape of foot is approximately ellipsoidal, the pile capacity increases very evidently, the soil near foot has been squeezed more dense, and the influence area of compressive stress near foot is much more wide compared with ordinary close bottom tubular pile. It is also proved by engineering practice that the pile has higher bearing capacity and smaller settlement,  more economic and environment protecion.
Keywords:expanded-foot tubular pile; static driving method;  experiment; bearing capacity
作者简介：丁翠红，硕士，副教授，Email:dingch188@sina.com。
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