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(1 南京工業(yè)大學(xué)交通學(xué)院,南京 210096;2 廈門市建設(shè)與管理局,廈門 361003)
[摘要]通常情況下,樁、土支承剛度差異顯著,相同荷載水平下兩者存在變形差,因此要實現(xiàn)樁土共同作用,必須要消除樁土的變形差,保證樁土的變形協(xié)調(diào)。在分析樁土共同作用機(jī)理的基礎(chǔ)上,對現(xiàn)有樁土共同作用的實現(xiàn)方法和發(fā)展趨勢進(jìn)行歸納與總結(jié)并將其分為三大類:補(bǔ)償位移法、剛度調(diào)整法以及預(yù)加位移法。其中,補(bǔ)償位移法又包括摩擦樁復(fù)合樁基與剛性樁復(fù)合地基,剛度調(diào)整法主要為筆者提出的設(shè)置調(diào)節(jié)裝置的端承樁復(fù)合樁基,預(yù)加位移法主要指樁頂設(shè)置柔性材料以及樁頂預(yù)留凈空復(fù)合樁基。對上述每類所包含的具體方法進(jìn)行了介紹,并對各自的適用條件、優(yōu)缺點進(jìn)行了對比與分析。
[關(guān)鍵詞]樁土共同作用;支承剛度;差異沉降;復(fù)合樁基
中圖分類號:TU470文獻(xiàn)標(biāo)識碼:A文章編號:1002-848X(2012)03-0140-04
Working mechanism and some realization methods of pilesoil interaction
Zhou Feng1, Lin Shuzhi1,2(1 Transportation College, Nanjing University of Technology, Nanjing 210096, China;2 Xiamen Construction and Administration Bureau, Xiamen 361003, China)
Abstract:Significant differences on supporting stiffness usually exist between piles and soils, and differential settlement is formed at the same level of loads. In order to realize pile-soil interaction, the differential settlement must be eliminated to ensure deformation compatibility of piles and soils. Based on analyzing mechanism of pile-soil interaction, existing methods and future development trend were summarized and divided into three classes: method of deformation compensation, method of rigid adjusting and method of preadditive deformation. The method of deformation compensation included friction pile composite foundation and rigid pile composite foundation. The method of rigid adjusting included end bearing pile composite foundation. The method of preadditive deformation included composite pile foundation with gap or flexible materials at pile head. These methods were introduced, and the applicable conditions, advantages and disadvantages of above methods were compared and analyzed.
Keywords:pile\|soil interaction; bearing stiffness; differential settlement; composite pile foundation
*國家自然科學(xué)青年基金(51008159),江蘇省高校自然科學(xué)基礎(chǔ)研究項目(08KJB560002),住房與城鄉(xiāng)建設(shè)部研究開發(fā)項目(2010-K3-4)。
作者簡介:周峰,博士,副教授,Email:nutzhoufeng@163.com。
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