长螺旋钻孔压灌混凝土桩承载特性分析

摘要

长螺旋钻孔压灌混凝土桩作为一种深基础,在具备桩基础优点的同时还具备其他特有的优点.通过工程实例,考虑到黄土地区地质条件的特殊性.采用MIDAS/GTS软件开展对长螺旋钻孔压灌混凝土桩承载特性的研究,通过数值分析得到长螺旋钻孔压灌混凝土桩相对于其他桩型在位移、应力方面变化特征,进而分析长螺旋钻孔压灌混凝土桩相对于其他桩型所具备的优势.结果表明:GTS很好地模拟了试桩的静载分级加载过程,只是计算值比试验值略微大一点.随着桩顶施加荷载的加大,这种误差的影响也就越来越小了;在相同桩径和地质条件下,长螺旋钻孔压灌混凝土桩承载力要比圆形状高很多.%Long auger bored concrete pile is a kind of deep foundation,it has the advantage of pile foundation and other special advantages.Considering the particularity of the geological conditions in the loess area,study on the bearing characteristics of long spiral bored concrete pile with MIDAS/GTS software,through the numerical analysis of Long Auger Bored Cast with pressure concrete pile compared with other piles in the displacement,stress variation,and analysis of Long Auger Bored Cast with pressure concrete compared with other type of pile pile has the advantage.The results show that the GTS is a good simulation of the static loading test of pile,just a little bigger than the calculated value of experimental values,with the increase of pile top load,the influence of this error is more and more small;in the same pile diameter and geological conditions,long auger bored to many higher than the round bearing capacity of concrete pile.