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施  峰     （福建省建筑科學(xué)研究院  福州 350025）

[提要]  通過(guò)對(duì)11根大直徑超長(zhǎng)鉆孔樁（其中9根樁身埋設(shè)有測(cè)試元件）的靜荷載試驗(yàn)，對(duì)大直徑超長(zhǎng)樁受最大荷載為24MN時(shí)的受力特性和荷載傳遞機(jī)理及側(cè)阻力、端阻力的變化規(guī)律進(jìn)行研究，分析了施工工藝、嵌巖深度、樁端高壓注漿等因素對(duì)大直徑超長(zhǎng)樁承載力的影響。介紹了重載試驗(yàn)的特點(diǎn)和難點(diǎn)，給出樁周土層的分層極限側(cè)阻力和極限樁端阻力，可為相同地質(zhì)條件的樁基設(shè)計(jì)提供可靠的依據(jù)。
[關(guān)鍵詞]  大直徑鉆孔灌注樁  超長(zhǎng)  荷載傳遞  現(xiàn)場(chǎng)試驗(yàn)  承載力

The mechanism of load transmission and variation law of lateral resistance ancl tip resistance of super long large diameter bored piles are studied through eleven field tests. The affecting factors of rock socket depth, pile end groutlng, construction technique are analyzed. The difficult point of high capacity static load tests is solvecI.The range of lateral resistance values of soil layers is presented.
Keywords: large diameter bored pile; super long; load transmission; field test; bearing capacity