考虑时间效应的湿陷性黄土地区桩基负摩阻力计算理论分析

摘要

对湿陷性黄土地区桩基负摩阻力的产生机理及变化规律进行了分析。利用桩土相互作用模型,推导出了适用于湿陷性黄土地区考虑时间效应的负摩阻力计算公式。利用此公式,只需要知道土体的剪切模量G、桩端荷载Nb和时间因子Tv,就可以方便地对任意时刻湿陷性黄土引起的单桩摩阻力的分布做出预测。%The principle and variation rule of the negative skin friction of piles in collapsible loess were analyzed.Based on interaction model between soil and single pile,a calculation method of negative skin friction resistance considering the time effect in collapsible loess area was also put forward.It is convenient to apply the formula to predicting the distribution of negative skin friction of single pile caused by collapsible loess at any time,only need to know the soil shear modulus,pile-side load and the time factor.