帶肋填砂管樁承載力研究
戴慶斌
- 摘 要
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戴慶斌（溫州職業(yè)技術(shù)學(xué)院， 溫州 325035）［摘要］對普通預(yù)應(yīng)力混凝土管樁樁身加肋、沉樁過程中在樁側(cè)填砂可有效提高樁基的承載能力。通過構(gòu)建基于樁-土荷載傳遞模型來分析帶肋填砂管樁的土層側(cè)阻力與位移間的對應(yīng)關(guān)系，確定樁-土荷載傳遞函數(shù)，進(jìn)一步分析研究了帶肋填砂管樁承載力的提高幅度。分析及實(shí)測結(jié)果均表明，相比普通管樁的側(cè)阻力，帶肋填砂管樁的土層側(cè)阻力有較大幅度的提高。然后又通過荷載傳遞模型反推出各土層側(cè)阻力屈服值及其對應(yīng)的位移，為以后帶肋填砂管樁的設(shè)計(jì)取值提供參考。同時(shí)還研究了帶肋填砂管樁的側(cè)阻、端阻所占的樁頂荷載的比例，及該比例與樁頂荷載之間的關(guān)系，結(jié)果表明此比例與樁頂荷載之間基本呈線性關(guān)系。［關(guān)鍵詞］帶肋填砂管樁； 承載力； 側(cè)阻力； 端阻力中圖分類號：TU473.1+1 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)05-0092-05Study on bearing capacity of ribbed and sand-filled tube pilesDai Qingbin（Wenzhou Vocational & Technical College, Wenzhou 325035, China）Abstract: Compared with prestressed concrete tube pile, the ribbed sand-filled tube pile can enhance the bearing capacity of the pile foundation. Based on load transfer model of pile-soil, the behavior of side resistance and displacement was analyzed, and the pile side soil layer load transfer function was obtained. The enhancement range of load bearing capacity was researched. Theoretic analysis and experiment results indicate that side resistance can enhance the bearing capacity of the pile foundation by using ribbed sand-filled tube pile. Through the load transfer model, the results of side resistance yield value and the corresponding displacement were derived reversely, which can provide reference for design. Simultaneously, the relationship of pile top resistance with the proportion of side resistance and pile end resistance was studied, which shows that a linear relationship holds between this proportion and pile top load.Keywords: ribbed sand-filled tube pile; bearing capacity; side resistance; end resistance作者簡介：戴慶斌，工程碩士，講師，Email:wz2002zj@126.com。參考文獻(xiàn)［1］金國平，黃敏，鄒宗煊，等. 擴(kuò)大頭帶肋填砂預(yù)應(yīng)力管樁的研究與應(yīng)用［J］.建筑結(jié)構(gòu)，2006，36(S1):57-61.［2］黃敏,龔曉南.一種帶翼板預(yù)應(yīng)力管樁及其性能初步研究［J］. 土木工程學(xué)報(bào),2005, 38(5):59-62.［3］黃敏,龔曉南. 帶翼板預(yù)應(yīng)力管樁承載性能的模擬分析［J］. 土木工程學(xué)報(bào),2005, 38(2):102-105.［4］肖宏彬,鐘輝虹,張亦靜，等.單樁荷載沉降關(guān)系的數(shù)值模擬方法［J］.巖土力學(xué),2002,23(5):592-596.［5］肖宏彬，張春順.樁端土和樁側(cè)土在荷載傳遞過程中的相互強(qiáng)化［J］.株洲工學(xué)院學(xué)報(bào)，2006，20(2):75-79.［6］溫州市建筑設(shè)計(jì)研究院.擴(kuò)大頭帶肋填砂預(yù)應(yīng)力管樁的研究與應(yīng)用鑒定報(bào)告［R］.2005：9-16.［7］戴慶斌,施均彬.預(yù)應(yīng)力混凝土管樁軸向力測試及計(jì)算方法［J］.浙江工貿(mào)職業(yè)技術(shù)學(xué)院學(xué)報(bào),2004, 5(1)：53-55.［8］蘇振明.預(yù)應(yīng)力管樁荷載傳遞特性［J］.建筑科學(xué),2005,21(1):88-93.［9］朱百里,沈珠江.計(jì)算土力學(xué)［M］.上海：上?？茖W(xué)技術(shù)出版社，1990：223-268.［10］劉利民,張建新.灌注樁臨界位移的探討［J］. 巖土工程技術(shù),1997(3): 19-21.［11］楊敏，王樹娟，王鈞，等.使用Geddes應(yīng)力系數(shù)公式求解單樁沉降的討論［J］.同濟(jì)大學(xué)學(xué)報(bào),1997,4 (3):71-74.［12］GEDDES J D. Stresses in foundation soils due to vertical subsurface load ［J］. Geotechnique, 1966,16(3): 231-255.［13］GB50007—2002建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范［M］.北京：中國建筑工業(yè)出版社，2002：140-143.［14］金明，龔維明，葛建光.砂土中超長樁承載性試驗(yàn)［J］.建筑結(jié)構(gòu)，2011,41(1):114-117.
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