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(1.四川建筑職業(yè)技術(shù)學(xué)院，德陽 618000；2.四川大學(xué)建筑與環(huán)境學(xué)院，成都 610065)
［提要］根據(jù)大直徑擴(kuò)底樁樁頂處的靜力平衡條件和變形協(xié)調(diào)條件，建立了考慮承臺(tái)效應(yīng)時(shí)計(jì)算大直徑擴(kuò)底樁沉降變形的公式。對(duì)某教學(xué)樓基礎(chǔ)工程的29根樁是否考慮承臺(tái)效應(yīng)分別進(jìn)行了沉降變形計(jì)算，并將計(jì)算結(jié)果進(jìn)行對(duì)比分析，結(jié)果表明，若樁基承臺(tái)底面與地基土緊密接觸，承臺(tái)效應(yīng)對(duì)大直徑擴(kuò)底樁沉降變形的影響不容忽略；地基土的壓縮模量越大，承臺(tái)效應(yīng)越顯著。
［關(guān)鍵詞］承臺(tái)效應(yīng)；大直徑；擴(kuò)底樁；沉降變形；影響分析
Analysis of Bearing Platform Effect on Settlement of Big Diameter Extendedbottom Pile/Xia Jianzhong1,Zhang Xinpei2(1 Sichuan College of Architecture Technology,Deyang 618000,China;2 Architecture and Environmental Institute,Sichuan University,Chengdu 610065,China)
Abstract:Based on the static equilibrium and deformation coordination condition of the big diameter extendedbottom pile,the formula for calculating the settlement of big diameter extendedbottom pile with the bearing platform effect,is put forward.29 piles of a teaching building with and without the bearing platform effect are calculated.The results are compared and  show that the effect of bearing platform on the settlement of big diameter extendedbottom pile can not be neglected if the bottom surface contacts the ground soil tightly,and larger the compression module of the ground soilis,more remarkable the effectis.
Keywords:bearing platform effect; big diameter; extendedbottom pile; settlement; influence analysis