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（1 南昌航空大學(xué)土木建筑學(xué)院, 南昌 330063；  2 中交一公局橋隧工程有限公司, 北京 100077；3 萍鄉(xiāng)市碧桂園投資有限公司, 宜春 337000）

［摘要］為探索帶帽有孔管樁復(fù)合地基荷載傳遞特性，對(duì)帶帽無(wú)孔管樁復(fù)合地基和三種開(kāi)孔方式的帶帽有孔管樁復(fù)合地基進(jìn)行了模型試驗(yàn)和數(shù)值模擬，研究了各樁型復(fù)合地基荷載沉降、樁身軸力、樁周土壓力、樁土荷載分擔(dān)比和樁土應(yīng)力比等承載性狀。試驗(yàn)結(jié)果驗(yàn)證了樁身開(kāi)孔能讓超孔隙水主動(dòng)進(jìn)入管樁內(nèi)腔，從而降低土體含水量，提高土體抗剪強(qiáng)度，更有利于發(fā)揮樁土體分擔(dān)荷載的作用，減小復(fù)合地基總沉降，以及提高復(fù)合地基承載力。研究成果能為有孔管樁復(fù)合地基理論研究提供基礎(chǔ)，并對(duì)其應(yīng)用推廣和優(yōu)化設(shè)計(jì)起指導(dǎo)作用。

［關(guān)鍵詞］帶帽有孔管樁； 復(fù)合地基； 荷載傳遞； 模型試驗(yàn)； 數(shù)值分析

中圖分類(lèi)號(hào)：TU443文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)21-0129-06

Analysis on load-transfer characteristics of composite foundation of pipe pile with cap and holes

Yang Jinyou1,2， Lei Jinbo1， Wan Menghua1， Zhou Xing3， Chen Kelin1

(1 College of Civil Engineering and Architecture, Nanchang Hangkong University, Nanchang 330063, China； 2 Bridge & Tunnel Engineering Co., Ltd.,  of CCCC First Highway Engineering Co., Ltd.， Beijing 100077, China；3 Pingxiang City Country Garden Investment Co., Ltd., Yichun 337000, China)

Abstract:In order to study the load transfer characteristics of the composite foundation of pipe pile with cap and holes, the model test and numerical simulation were carried out on pipe pile composite foundation with cap as well as pipe pile composite foundation with cap and holes (with three kinds of hole opening styles). The bearing behaviors such as load settlement, pile axial force, pile surrounding soil pressure, pile-soil load sharing ratio and pile-soil stress ratio were studied. The test results verify that the opening of the pile body allows the super-porous water to actively enter the inner cavity of the pipe pile, thereby reducing the water content of the soil and improving the shear strength of the soil, which is more conducive to the role of the pile-soil sharing load and the reduction of the total settlement of the composite foundation and increase the bearing capacity of the composite foundation. The research results can provide a basis for the theoretical study of composite foundation of pipe piles with cap and holes, and provide guidance for its application and optimization design.

Keywords:pipe pile with cap and hole; composite foundation; load transfer; model test; numerical simulation

*國(guó)家自然科學(xué)基金項(xiàng)目（51268048，51768047），江西省自然科學(xué)基金項(xiàng)目（20171BAB206059），江西省教育廳科研基金項(xiàng)目（GJJ14527）。

通訊作者：雷金波，博士，教授，碩士生導(dǎo)師，Email：18979103608@189.cn。