摘要
桩端后注浆是软土地区大直径超长钻孔灌注桩发展的必然趋势。依据软土地区某超高层建筑大直径超长钻孔灌注桩试桩的竖向抗压静载试验结果,通过对基桩的竖向极限承载力性状、桩身轴力传递特性以及桩侧阻力、桩端阻力发挥特性的分析研究,揭示了桩端后注浆对基桩承载性状的影响情况,深入探讨了软土地区大直径超长后注浆灌注桩的荷载传递机理和竖向承载性状,并提出了单桩承载力的估算方法。
Base-grouting is an inevitable development trend of overlength large-diameter bored piles in soft clay area. Based on the results of vertical static loading test of the two single piles with base-grouting in the super high-rise building,the influence of base-grouting on the bearing property of the pile is revealed by analyzing its properties of vertical limit bearing capacity, axial load transmission and tip and shaft resistance of pile. The load transfer performance and bearing mechanism are discussed in detail. A method is suggested to estimate the ultimate bearing capacity of a single pile.
出处
《建筑结构》
CSCD
北大核心
2006年第4期34-36,67,共4页
Building Structure
关键词
软土
大直径超长灌注桩
桩端注浆
高吨位静载试验
荷载传递
soft soil
super long and large-diameter bored pile
base-grouting
vertical static loading test
