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（1 江西華杰建筑設(shè)計(jì)有限公司， 南昌 330003； 2 南昌大學(xué)建筑工程學(xué)院， 南昌 330031；3 江西基業(yè)科技有限公司， 南昌 330200）

［摘要］提出一種異形截面全夯式擴(kuò)底灌注樁，與直徑500mm圓形截面全夯式擴(kuò)底灌注樁進(jìn)行對(duì)比，異形截面全夯式擴(kuò)底灌注樁橫截面面積可以擴(kuò)大至圓形截面面積的1-357倍，且施工貫入比較容易，異形截面全夯式擴(kuò)底灌注樁與圓形截面全夯式擴(kuò)底灌注樁在同等樁身截面面積的情況下還可增大樁身側(cè)面積，有利于增大摩擦力。對(duì)3根內(nèi)切圓直徑為500mm的異形截面全夯式擴(kuò)底灌注樁進(jìn)行現(xiàn)場(chǎng)載荷試驗(yàn)并采用ABAQUS軟件對(duì)其進(jìn)行分析，得到了異形截面全夯式擴(kuò)底灌注樁荷載-沉降曲線和樁端土體擠密影響范圍。有限元計(jì)算結(jié)果與現(xiàn)場(chǎng)試驗(yàn)結(jié)果基本吻合，驗(yàn)證了異形截面全夯式擴(kuò)底灌注樁樁端土體擠密范圍取值的合理性及數(shù)值模擬結(jié)果的準(zhǔn)確性。

［關(guān)鍵詞］全夯樁； 異形截面； 擴(kuò)底灌注樁； 有限元分析

中圖分類號(hào)：TU473文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)16-0127-06

Study on mechanism of vertical bearing capacity of fully rammed bottom-enlarged bored pile with irregular section

Zheng Youming1， Dai Hongtao2, Liu Xiangang3, Zhang Yifan2, Li Yonghua2

(1 Jiangxi Huajie Architectural Design Co., Ltd., Nanchang 330003, China; 2 School of Architecture and Civil Engineering,  Nanchang University, Nanchang 330031, China; 3 Jiangxi Jiye Science and technology Ltd., Nanchang 330200, China)

Abstract:A new fully rammed bottom\|enlarged bored pile with irregular section was presented. Comparing with the fully rammed bottom-enlarged bored pile with 500mm diameter circular section, the cross-sectional area of the fully rammed bottom-enlarged bored pile with irregular section can be expanded to 1-357 times of the circular  cross-sectional area, and the construction penetration is relatively easy. Given the same section area of pile body, fully rammed bottom-enlarged bored pile with irregular section can increase the lateral area of pile body, which is beneficial to increase friction when compared with the circular section pile. Three fully rammed bottom-enlarged bored piles with irregular section of  500mm inner tangential circle diameter were field tested and analyzed by ABAQUS software. The load-displacement curves of fully rammed bottom-enlarged bored piles with irregular section and the influence range of soil compaction at the end of piles were obtained. The results of finite element calculation are basically in agreement with the field test results, which can verify the rationality  of the soil compaction range at the end of the irregular-shaped fully rammed bored pile  and the accuracy of the numerical simulation results.

Keywords:fully rammed pile; irregular section; bottom\|enlarged bored file; finite element analysis

通訊作者：李永華，博士，副教授，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email: liyonghua@ncu.edu.cn。