多头夯扩桩扩大头尺寸计算方法试验研究

目前多头夯扩桩扩大头尺寸试验相关研究较少,为弥补该方面研究空白,以等体积法为基础,采用标准圆球法计算理论推导,提出了新的夯扩桩扩大头直径计算公式。在此基础上于砂土中开展了多头夯扩桩室内扩大头成桩试验,对扩大头计算方法进行对比验证。由试验得出的试桩模型,可见多头夯扩桩下部桩身扩大头多呈近似圆球状或腰鼓形,上部桩身扩大头基本呈近似球形。经试验数据表明,与目前国内常用两种扩底桩计算公式比较,提出的多头夯扩桩扩大头尺寸计算公式计算结果更接近实际。成果可供多头夯扩桩设计及施工提供参考。

Pile Model Test with calculating base size of Ram-compaction Multipile Expansion Pedestal Piles

The correlative research about the size of rammed enlarged-base in Ram-compaction Multipile Expansion Pedestal Piles has been reported less, this paper uses the standard spherical calculate method based on the equal volume method,than proposes a new computing formula of enlarged-base diameter to make up the research in this area blank.We do pile model tests in sand based on the theory and validate the proposed new enlarged diameter calculation method based upon test results .Obtained by the test pile model test, it shows that the lower part of the pile enlarged was nearly like a round or a drum, the upper part of the pile enlarged is approximately spherical.The experimental datas show,the proposed calculation formula in this paper is more close to the measured value compared with the current two kinds of calculation formulas.The results can be used for the design and construction of Ram-compaction Multipile Expansion Pedestal Piles.