大直径灌注桩桩身轴力试验研究

Research on axial force test of large diameter piles

结合单桩载荷试验,通过在桩身中分层、均匀埋设钢筋计,将试桩沿深度分成多个截面,推算桩身不同深度的轴力大小,并测量桩在各级荷载作用下的桩顶沉降,详细分析了单桩的Q-S曲线特征、桩身轴力的分布规律等。结果表明,在竖向荷载作用下,桩身轴力沿桩的深度逐渐衰减,随着荷载等级的加大,轴力沿桩身衰减的速率也在加大,且桩的深度越深变化速率也就越大。

Based on the test of the single pile load,axial force from different depth can be measured in the way which dividing the depth of the pile into several sections by stratifying the pile and burying reinforcement meter into it evenly.Settlement of the top of pile under various levels load is also measured in the same way.Under the vertical load,Q-S curve characteristics of the single pile as well as distribution of the axial force are precisely analyzed in this article.Pile axial force along the pile gradually decays with the increase of the load level;the rate of the decay is getting bigger at the same time.It changes severely with the change of the depth of the pile.