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(1中國建筑科學(xué)研究院地基基礎(chǔ)研究所， 北京  100013； 2 建筑安全與環(huán)境國家重點(diǎn)實(shí)驗(yàn)室， 北京  100013；  3 北京市地基基礎(chǔ)與地下空間開發(fā)利用工程技術(shù)研究中心， 北京  100013)

［摘要］樁身軸力傳遞自上而下逐漸減弱，樁身壓縮也隨之由大變小。對(duì)于長樁，大量實(shí)測(cè)結(jié)果表明，在工作荷載下，中下部樁身側(cè)摩阻力較難發(fā)揮，樁身也不會(huì)發(fā)生壓縮變形?；跇秱?cè)摩阻力分布概化結(jié)果計(jì)算樁身壓縮量，采用綜合系數(shù)法，將實(shí)際樁側(cè)摩阻力分布的形式按不同樁側(cè)摩阻力概化模式進(jìn)行概化，概化后分解為基本的矩形和三角形單元分別計(jì)算，并與實(shí)際工程的試樁實(shí)測(cè)樁身壓縮量進(jìn)行對(duì)比。結(jié)果表明，采用的樁身壓縮量計(jì)算方法計(jì)算結(jié)果與實(shí)測(cè)值較為接近，說明采用的樁身壓縮量計(jì)算方法可靠，可為類似工程提供參考。

［關(guān)鍵詞］樁側(cè)摩阻力； 端阻力； 概化模式； 超長樁； 樁身壓縮量

中圖分類號(hào)：TU473文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)17-0130-06

Calculation of  pile body compression based on pile shaft resistance conceptualization mode

Wang Tao1,2,3, Chu Zhuo1,2,3, Liu Jinli1,2,3, Wang Xu1,2,3

(1 China Academy of Building Research Foundation Institute, Beijing 100013, China; 2 State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China; 3 Beijing Engineering Technology Research Center of Foundation and City Underground Space Development and Utilization, Beijing 100013, China)

Abstract:The axial force transmission of pile body gradually weakens from top to bottom, and the compression of pile body also decreases from large to small. For long piles, a large number of measured results show that under normal working load, the shaft resistance of the middle and lower part of the pile body is difficult to play, and the pile body will not undergo compression deformation. Based on the conceptualized results of pile shaft resistance distribution, the compression of pile body was calculated. The actual distribution of pile shaft resistance was conceptualized according to different conceptualization mode of pile shaft resistance. After generalization, it was decomposed into basic rectangular and triangular elements, and compared with the measured compression of pile body in practical engineering. The results show that the calculated results of pile compression are close to the measured values, which indicates that the calculation method of pile compression is reliable and can provide reference for similar projects.

Keywords:pile shaft resistance; tip resistance; conceptualization mode; super-long pile; pile body compression