大直径钻孔灌注桩的承载力发挥特征分析

以某工程大直径桩为研究对象,采用现场试桩、理论分析计算相结合的方法,对大直径深长钻孔灌注桩的承载力发挥特征进行了研究,主要包括以下几个内容：（1）进行了4根大直径桩静载荷试验,获得了各试桩的极限承载力;（2）通过在桩身埋设钢弦式钢筋计,量测得各级荷载下桩身的内力变化情况;（3）通过计算得出桩身轴力和桩侧摩阻力沿桩身的分布规律以及桩侧摩阻力和桩端阻力的发挥情况,并以此为基础研究了桩基荷载传递特性及侧摩阻力发挥规律。

Research on the End Bearing Capacity Features of Large-diameter Bored Piles

Based on a project,we carry on an field test of the pile,combining theoretical analysis and calculation methods,the large diameter long playing characteristics of the bearing capacity of bored piles have been studied,it include the following contents：（1） Conducted four large-diameter pile load test design,get the ultimate bearing capacity of each pile,（2）Through the reinforcement meter buried in the pile we measured the amount of internal forces at each levels of load,（3）Through calculation,the distribution law of column load and pile side friction along the shaft,and the situation of pile shaft resistance and toe resistance are got.Based on the above achievements,the law of pile load transfer and shaft resistance are obtained.