现浇X型混凝土桩截面几何特性研究  

Study on the Geometric Characteristics of the Cast-in-Place X-Type Vibro-Pile Section

作　　者：刘汉龙[1,2] 刘芝平[1,2] 王新泉[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098

出　　处：《中国铁道科学》2009年第1期17-23,共7页China Railway Science

基　　金：江苏省"六大人才高峰"基金资助项目(50528512)

摘　　要：基于X型桩截面的外包方形截面边长、开弧间距及开弧弧度3个控制变量,推导X型截面面积、周长表达式,建立X型桩截面惯性矩的数值计算方法。X型桩的截面面积及截面惯性矩随外包方形截面边长和开弧间距的增大而增大,随开弧弧度数的增大而减小;周长随X型桩截面3个控制变量的增大均增大;周长与面积比随外包方形截面边长和开弧间距的增大而减小、随开弧弧度数的增大而增大。截面面积相同时,X型桩的周长及截面惯性矩均比圆形桩和方形桩大,且比值均随外包方形截面边长及开弧弧度数的增大而增大,随开弧间距的增大而减小。可见,截面面积相同时,X型桩的侧摩阻力大于圆形桩和方形桩,单桩承载力高。Based on three control variables of X-type vibro-pile section, namely, the side length of the cased square section, the space between the open arcs and the radian, the expressions of the area and perimeter of X-type vihro-pile section were deduced. The numerical method for calculating the inertia moment of X-type vibro-pile section was established. The area of X-type vibro-pile section and the inertia moment of the section increase along with the increase of the side length of the cased square section and the space between the open arcs, and decrease with the increase of open arc radian. The perimeter increases with the increase of three control variables of X-type vibro-pile section. The ratio of perimeter to area decreases along with the increase of the side length of the cased square section and the space between the open arcs, and increase with the increase of open arc radian. The perimeter of X-type vibro-pile section and the inertia moment of the section are bigger than those of circular pile and square pile with the same section area. The ratios increase with the increase of the side length of the cased square section and the radian, and decrease with the increase of the space between the open arcs. It is obvious that the side friction of X-type vibro-pile is bigger than those of circular pile and quadrate pile with same section area, and the bearing capacity of single pile is higher.

关 键 词：地基处理 沉管灌注桩 X型混凝土桩 截面几何性质 惯性矩 

分 类 号：TU473.12[建筑科学—结构工程]