后注漿超長鉆孔灌注樁抗壓承載力試驗研究
楊進(jìn)喜1,丁永君2
- 摘 要
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（1 天津市建筑設(shè)計院，天津 300074；2 天津大學(xué)建筑設(shè)計院，天津 300072）［摘要］以天津地區(qū)某在建超高層的樁基靜載試驗為基礎(chǔ)，對軟土地區(qū)后注漿超長鉆孔灌注樁的承載性能進(jìn)行了研究。結(jié)果表明：軟土地區(qū)的超長鉆孔灌注樁為純摩擦樁；超長鉆孔灌注樁樁側(cè)摩阻力和樁端阻力的發(fā)揮是不同步的，樁側(cè)摩阻力的發(fā)揮先于樁端阻力；超長鉆孔灌注樁的樁頂沉降量很大，應(yīng)采用樁頂沉降量來確定其極限承載力；超長鉆孔灌注樁存在有效樁長，其長徑比不超過80是比較合理的。［關(guān)鍵詞］超長鉆孔灌注樁; 靜載荷試驗; 單樁極限承載力中圖分類號：TU473.1+4 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)22-0086-04Experimental research on compression bearing capacity of super-long bored pile with post-groutingYang Jinxi1, Ding Yongjun2(1 Tianjin Architecture Design Group, Tianjin 300074, China; 2 Tianjin University Architecture Design Group, Tianjin 300072, China)Abstract: Based on the static loading tests of the pile foundation of a super high-rise building in Tianjin, the bearing capacity characteristics of super-long bored pile with post-grouting in soft soil areas were studied. Results show that the super-long bored pile with post-grouting is pure friction piles in soft soil area. The lateral friction resistance and the bottom resistance of the super-long pile with post-grouting display asynchronously, and the former resistance displays at the first. The settlement of the pile toe of the super-long pile with post grouting is very large, so the settlement of pile top should be used to design the ultimate bearing capacity. The super-long pile has effective pile length and pile lengthdiameter ratio is reasonable under 80.Keywords: super-long bored pile with post-grouting; static loading test; ultimately bearing capacity of single pile作者簡介：楊進(jìn)喜，碩士，工程師，Email:yangjinxi119@126.com。參考文獻(xiàn)［1］高飛. 上海地區(qū)超長后注漿鉆孔樁豎向承載力試驗研究［J］. 上海地質(zhì)，2007(2): 45-48.［2］JGJ 94—2008建筑樁基技術(shù)規(guī)范［S］. 北京：中國建筑工業(yè)出版社，2008.［3］曹國峰,李亞明，蔣鎮(zhèn)華. 大直徑超長樁端后注漿鉆孔灌注樁在寧波地區(qū)的應(yīng)用［J］. 建筑結(jié)構(gòu)，2011,41(S1):1240-1245.［4］程曄,龔維明,戴國亮，等. 超長大直徑鉆孔灌注樁樁端承載力研究［J］. 南京航空航天大學(xué)學(xué)報：自然科學(xué)版，2007,39(3): 407-411.
