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通过分析都江堰地区冲孔灌注桩试桩试验结果,对桩侧、桩端后注浆技术在冲孔灌注桩中的实际应用进行研究。采用自平衡方法对单桩进行加载试验,得到桩身侧摩阻力分布以及桩底反力发展过程。用理论公式与实测反力进行比较,分析自平衡方法测试的特征。理论公式计算与单桩静载试验结果对比表明:①理论公式中桩侧承载力计算结果偏大,对比实测后注浆桩侧侧摩阻力,注浆桩侧阻力增强系数增强后的桩侧摩阻力值偏高;②桩端后注浆采用桩端增强系数修正后的桩端阻力与实测结果基本相符合;③单桩静载试验结果的Q-s归一曲线可采用双折线来近似表达,给出单桩静载的预估曲线公式。预估结果表明与实测具有较好的一致性。
By analyzing the test results of perforated piles in Dujiangyan area, the practical application of piles and post-grouting technology in perforated piles was studied. The self-balance method is used to test the single pile. The frictional force distribution and pile bottom reaction force are obtained. The theoretical formula is compared with the measured reaction force to analyze the characteristics of the self-balancing method. The comparison between the theoretical formula and the static load test results of single pile shows that: (1) The calculation results of the bearing capacity of the pile in the theoretical formula are too large. Compared with the measured results, the lateral friction of the grouting pile and the side reinforcement The resistance value is high; ② The post-pile grouting is basically consistent with the measured results after the pile end reinforcement coefficient is modified; ③ The Qs regression curve of single pile static load test results can be approximated by the double broken line, Predict curve formula of static load of single pile. Estimated results show that measured with good consistency.