柔性长短桩组合型复合地基离心模型试验研究  

Centrifugal Modeling of Flexible Non-uniform Piles in Composite Foundation

作　　者：李波[1] 黄茂松[2,3,1] 程岳 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [2]同济大学地下建筑与工程系,武汉430010 [3]同济大学 [4]上海港湾软地基处理工程(集团)有限公司,上海200092

出　　处：《长江科学院院报》2012年第4期71-74,共4页Journal of Changjiang River Scientific Research Institute

基　　金：国家863计划课题(2007AA11Z117)

摘　　要：开展了柔性长短桩组合型复合地基和传统的等长桩复合地基2组离心模型试验,研究路堤荷载下柔性长短桩组合型复合地基的加固机理。试验中路堤表面关键点处设置位移计,布设分层沉降标示点,在土层不同深度处埋置孔压传感器和土压传感器等。试验结果表明:长短桩组合型复合地基中长桩的桩土应力比明显增大,并且在总桩长相同的条件下比等长桩复合地基更利于控制总沉降和侧向位移。Two centrifuge model tests were carried out to study the mechanism of reinforcing composite foundation with flexible non-uniform piles under embankment load.One centrifuge model is with non-uniform piles（new type embankment）,and the other with piles of equal length（traditional embankment）.Several miniature pore pressure transducers（PPTs） and earth pressure transducers（EPTs） were installed in different depths of earth in the tests.Displacement sensors were arranged at key points on the embankment surface.The results obtained from the two centrifuge tests showed that the pile-soil stress ratio of longer piles in the new type embankment increased remarkably.When the total length of non-uniform piles was equal to that of uniform piles,the new type embankment had a less total settlement than traditional embankment at the top of the piles.Furthermore,the lateral settlements of this new type embankment were less than those of the traditional embankment.

关 键 词：长短桩 复合地基 离心模型试验 桩土应力比 

分 类 号：U416.1[交通运输工程—道路与铁道工程]