基桩负摩阻力计算方法对比研究

Comparison Study on Negative Skin Friction Resistance Calculation Methods for Piles

基桩负摩阻力问题广泛存在,分析其分布规律及对比已有的计算方法,具有重要的工程实际意义。以实际工程为背景,应用国内外常用的负摩阻力计算方法进行计算分析并对比,发现基桩负摩阻力随堆载高度和软土厚度的增大而增大;我国的《建筑桩基技术规范》最为保守,依据其计算负摩阻力时可进行适当的折减。

Negative skin friction resistance most possibly exists on piles when the soil around pile move downward relative to the pile,so to determine the distribution rule and compare existing calculation methods of negative skin friction resistance are of important practical significance in engineering. Based on practical engineering,the commonly used negative skin friction resistance calculation methods were analyzed and compared. It is found that,negative skin friction resistance increases with increasing thickness of soft soil and preloading height.'Building pile technical specifications'of China is conservative,and the calculated results of negative skin friction based on 'building pile technical specifications'can be discounted.