后压浆钻孔灌注桩动静对比试验研究

后压浆钻孔灌注桩可以大大改善桩体的受力性能,提高单桩承载力,是对传统工法的一项重大突破。在桩基设计中,单桩竖向承载力的确定影响到整个设计方案的科学性及合理性,决定着方案实施的成败。某后压浆钻孔灌注桩试验工程采用单桩竖向静载荷试验和高应变动测技术进行单桩承载力测试,通过对动静试验数据进行对比分析发现,两种试验方法测得的总阻力基本一致,而桩侧摩阻力及端阻力的试验结果稍有偏差,对存在的差异进行了合理的分析,从而可以更准确地确定单桩承载力,大大提高了试验的精度。

Contrast study on comparison between high strain dynamic test and static loading test of posterior grouting bored pile

The posterior grouting bored pile can greatly improve the pile's bearing performance and increase the pile capacity through the improvement to traditional process.The vertical load capacity of single pile is so important that it determines the rationality and feasibility of the design.The vertical static load test and high strain dynamic test are used in a project of posterior grouting bored piles,and the test data is contrasted and analyzed.The results illustrate that the resistance got from the two methods is basically unanimous,though the side resistance and the tip resistance have a little difference.The result is analyzed reasonably,so the pile capacity can be determined accurately ,which greatly improves the test accuracy.