上海虹桥综合交通枢纽后注浆灌注桩现场试验研究

Research on post-grouting pile field testing of Shanghai Hongqiao transportation hub

本文依托上海虹桥交通枢纽工程,进行了桩端后注浆灌注桩的静载荷试验,并采用先进的布里渊光时域反射技术和光纤布拉格光栅技术测量了桩身应力,获得了较好的测量效果。试验结果表明:桩端后注浆可显著提高抗压桩的极限承载力,提高幅度在70%～80%左右;桩端后注浆对减少桩顶位移也有显著的作用;桩端后注浆还能够提高桩端以上一定范围内土体的侧摩阻力。

This article is based on the Shanghai Hongqiao transportation hub.Static load test is carried out to the post-grouting pile.To obtain the high quality results,BOTDR and FPG method is employed to measure the axial force of the pile.The result of the experiment shows that the bearing capacity of the pile can increase 70% ～ 80%,the post-grouting at pile bottom can reduce the displacement of the pile head and increase the skin friction of the soil above the bottom of the pile.