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（1 浙江工業(yè)大學(xué)建工學(xué)院，杭州 310014； 2 浙江工業(yè)大學(xué)建筑規(guī)劃設(shè)計(jì)研究院，杭州 310014）
［摘要］通過(guò)室內(nèi)模型試驗(yàn)和現(xiàn)場(chǎng)試驗(yàn)與等直徑樁進(jìn)行對(duì)比，并在工程中試用，對(duì)擴(kuò)底管樁的承載性狀和擴(kuò)大頭的形成情況進(jìn)行了研究和探討。發(fā)現(xiàn)管樁經(jīng)靜壓混凝土擴(kuò)底后擴(kuò)大頭為近似橢球體，擴(kuò)底管樁比普通封底管樁承載力提高顯著，樁端土擠密作用明顯，樁端土壓力影響范圍廣。工程試用結(jié)果證明該樁型具有承載力高、沉降小、經(jīng)濟(jì)環(huán)保等特點(diǎn)。
［關(guān)鍵詞］擴(kuò)底管樁；靜壓法；試驗(yàn)；承載力
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
作者簡(jiǎn)介：丁翠紅，碩士，副教授，Email:dingch188@sina.com。
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