軟土地區(qū)大直徑超長樁承載性狀研究*
郭一斌1，趙廣民2，張立明3，徐澤民3
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（1 天津大學(xué)土木工程系， 天津 300072； 2 中交一航局第四工程有限公司， 天津 300456；3 天津市地下鐵道集團(tuán)有限公司， 天津 300000）
［摘要］基于3根樁端和樁側(cè)后注漿的大直徑超長樁破壞性試樁試驗(yàn)，對超長樁的樁頂荷載樁頂沉降特性、樁身側(cè)阻力及端阻力的發(fā)揮特性等進(jìn)行了分析。結(jié)果表明，在樁身完整和樁底沉渣較小的情況下，超長樁加載到一定荷載水平時(shí)仍然可能發(fā)生陡降式破壞。在承載力特征值作用下，超長樁承載特性可以認(rèn)為是純摩擦樁。由于超長樁樁身壓縮量較大，樁身側(cè)阻力由上向下逐步發(fā)揮。超長樁側(cè)阻力軟化現(xiàn)象主要發(fā)生在樁身中上部側(cè)阻力發(fā)揮較早的部分，樁身下部側(cè)阻力發(fā)揮較晚而未發(fā)現(xiàn)側(cè)阻力軟化現(xiàn)象。［關(guān)鍵詞］軟土地區(qū); 超長樁; 承載特性; 破壞性試樁試驗(yàn)中圖分類號：TU473 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2015)21-0074-05
Bearing characteristics study on large diameter super-long piles in soft soil areaGuo Yibin1, Zhao Guangmin2, Zhang Liming3, Xu Zemin3(1 Department of Civil Engineering, Tianjin University, Tianjin 300072, China; 2 No. 4 Engineering Company Ltd. of CCCC First Harbor Engineering Company Ltd., Tianjin 300456, China; 3 Tianjin Metro Group Co., Ltd., Tianjin 300000, China)Abstract: Based on destructive pile tests of three large diameter super-long piles with shaft and end post grouting, pile tip load-pile tip settlement characteristics, playing characteristics of shaft resistance and tip resistance were analyzed. Results show that steep drop failure may happen in super-long piles with well stake body integrity and small sediment in pile bottom when the loads reach certain level. Bearing characteristics of super-long piles can be considered asfriction piles under the bearing capacity characteristic value actions. The shaft resistance of super-long piles mobilizes from pile top to bottom due to largecompression of pile body. Shaft resistance degradation phenomenon of super-long piles is discovered in the upper part of the super-long pile which the shaftresistance mobilizes earlier, and that is not discovered in the lower part of the piles which the shaft resistance mobilizes relatively late.Keywords: soft soil area; super-long pile; bearing characteristic; destructive pile test
*國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）資助項(xiàng)目（2010CB732106），天津市建委科技項(xiàng)目（2014-9）。作者簡介：郭一斌，博士，講師，Email: 259582620@qq.com。
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