不同桩侧粗糙度下桩侧阻力分析

Analysis of effects of hole side roughness on pile side resistance

为了探讨桩侧的粗糙程度对桩侧阻力的影响,以嵌岩桩为例,通过室内模型试验和数值模拟分析对该问题进行了研究。结果表明桩侧孔壁粗糙程度直接影响着桩侧阻力的大小和分布,也影响着桩侧阻力的发展进程。认识到:当桩侧从光滑到具有一定粗糙度时,桩侧阻力有很大幅度的增长,但随着粗糙度的进一步提高,桩侧阻力提高的幅度将减小。施工时可通过一定的技术方法增加孔壁的粗糙度,从而提高钻孔灌注桩的承载力。

The paper studies the effects of hole side roughness on the pile side resistance through room model tests and the analysis of numerical modelling. The results show that the resistance on the side surface of pile increases largely as the roughness of the wall of hole increases in a limit range. Out of this range, the resistance will increase little as the roughness of the wall of hole increases. The principle can be used in pile construction for increasing the bearing capacity.