填芯PHC管樁樁身抗壓承載力試驗(yàn)與理論計(jì)算方法研究*
唐孟雄1，戚玉亮1，2，周治國(guó)1，胡賀松1，2
- 摘 要
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（1 廣州市建筑科學(xué)研究院有限公司，廣州 510440；2 華南理工大學(xué)土木與交通學(xué)院，廣州 510641）［摘要］為了考察豎向極限荷載作用下填芯管樁的力學(xué)性能，開(kāi)展了填芯PHC管樁樁身的室內(nèi)模型試驗(yàn)研究。提出了不考慮與考慮混凝土殘留預(yù)壓應(yīng)力影響以及不考慮與考慮樁身配筋作用下的填芯PHC管樁樁身抗壓承載力的修正理論計(jì)算公式。通過(guò)對(duì)空心、素混凝土填芯、鋼筋混凝土填芯PHC管樁樁身抗壓承載力的試驗(yàn)與理論計(jì)算研究，得出如下結(jié)論：填芯PHC管樁的樁身抗壓承載力設(shè)計(jì)值的計(jì)算結(jié)果與其實(shí)測(cè)結(jié)果之比介于59.9%～93.8%之間，計(jì)算結(jié)果普遍小于實(shí)測(cè)結(jié)果，說(shuō)明理論計(jì)算公式偏于安全；不考慮混凝土殘留預(yù)壓應(yīng)力但考慮樁身配筋作用時(shí)，樁身抗壓承載力設(shè)計(jì)值的理論計(jì)算結(jié)果與試驗(yàn)結(jié)果最接近；采用不考慮混凝土殘留預(yù)壓應(yīng)力和樁身配筋作用的理論公式計(jì)算填芯PHC管樁樁身抗壓承載力設(shè)計(jì)值是安全、適用的；填芯能夠在一定程度上提高PHC管樁的樁身抗壓承載力，鋼筋混凝土填芯對(duì)PHC管樁樁身抗壓承載力的增強(qiáng)效果好于素混凝土填芯；直徑大于1 000mm的PHC管樁填芯后其樁身抗壓承載力提高50%以上，隨著PHC管樁直徑的增大，填芯對(duì)PHC管樁樁身抗壓承載力的貢獻(xiàn)也進(jìn)一步增大。［關(guān)鍵詞］填芯PHC管樁; 殘留預(yù)壓應(yīng)力; 抗壓承載力; 素混凝土填芯; 鋼筋混凝土填芯中圖分類號(hào)：TU473 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)01-0067-05Study on experiment and theoretical calculation method of compressive bearing capacity of filled PHC pipe pilesTang Mengxiong1, Qi Yuliang1, 2, Zhou Zhiguo1, Hu Hesong1, 2（1 Guangzhou Institute of Building Science Co., Ltd., Guangzhou 510440, China; 2 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China)Abstract: In order to investigate the mechanical properties of filled pipe piles under the action of the vertical ultimate load, the research was carried out on indoor model test of PHC pile filled with concrete core. The corrected theoretical formulas of axial compressive bearing capacity of PHC pile filled with concrete core were proposed considering concrete residual compressive pre-stress effect and pile reinforcement effect or not. By the comparative analysis between the compressive bearing capacity experimental values and its corresponding theoretical calculation values of PHC pipe piles and PHC pipe piles filled with concrete core or reinforced concrete core, it suggests that the ratios of the calculation compressive bearing capacity design value and its test value are between 59.9% to 93.8%, most of the calculated values are less than the measured values which indicates the safety of theoretical formula. In the case of not considering the residual pre-stress but considering the role of concrete pile reinforcement effect, the theoretical calculation result is the most close to the test result of vertical compressive bearing capacity design value of filled PHC pipe piles. The calculation formula not considering the residual pre-stress and concrete pile reinforcement is used to calculate the design value of vertical compressive bearing capacity of filled PHC pipe piles, which is safe and applicable. The filling core is helpful to improve the compressive bearing capacity of PHC pipe piles to a certain extent, and the compressive bearing capacity of PHC pipe piles filled with reinforced concrete core is better than that of plain concrete core. The bearing capacity of PHC pipe piles diameter is greater than 1 000mm filled with concrete core increases by more than 50%. Moreover, with the increase of PHC pipe piles diameter, the contribution of filling core to compressive bearing capacity of PHC pipe piles further increases.Keywords: filled PHC pipe pile; residual compressive pre-stress; compressive bearing capacity; plain concrete filling core; reinforced concrete filling core*廣東省教育部科技部產(chǎn)學(xué)研結(jié)合項(xiàng)目(2012B090600046)。作者簡(jiǎn)介：唐孟雄，博士，教授級(jí)高工，Email:tmx@gibs.com.cn。參考文獻(xiàn)［1］邢皓楓，趙紅崴，葉觀寶，等. PHC管樁工程特性分析［J］. 巖土工程學(xué)報(bào), 2009, 31(1): 36-39.［2］張忠苗. 樁基工程［M］. 北京: 中國(guó)建筑工業(yè)出版社，2007.［3］施峰. PHC 管樁荷載傳遞的試驗(yàn)研究［J］. 巖土工程學(xué)報(bào), 2004, 26(1): 95-99.［4］鄧友生, 孫寶俊, 鄔忠強(qiáng). 預(yù)應(yīng)力混凝土管樁的應(yīng)用研究及發(fā)展前景［J］. 建筑技術(shù), 2003, 34(4): 263-266.［5］史佩棟. 實(shí)用樁基工程手冊(cè)［M］. 北京: 中國(guó)建筑工業(yè)出版社, 1999.［6］徐至鈞, 李智宇, 張亦農(nóng). 預(yù)應(yīng)力混凝土管樁基礎(chǔ)設(shè)計(jì)與施工［M］. 北京: 機(jī)械工業(yè)出版社, 2005.［7］龔曉南. 復(fù)合地基理論及工程應(yīng)用［M］. 北京: 中國(guó)建筑工業(yè)出版社, 2002.［8］王清，陳磊，匡紅杰，等. 預(yù)應(yīng)力混凝土管樁軸心受壓承載力計(jì)算［J］. 建筑結(jié)構(gòu), 2011, 41（2）: 113-115.［9］湯關(guān)祚，匡紅杰. 預(yù)應(yīng)力對(duì)預(yù)應(yīng)力混凝土管樁和空心方樁軸心受壓承載力的影響［J］. 混凝土與水泥制品, 2013, 33(7): 26-29.［10］唐孟雄, 戚玉亮, 周治國(guó)，等. 空心與填芯PHC管樁抗彎試驗(yàn)及其理論計(jì)算研究［J］. 巖土工程學(xué)報(bào), 2013, 35(S2): 1075-1080.
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