后注浆灌注桩承载力试验及分析

Experimental Analysis on Bearing Capacity of Post-Grouting Simplex Pile

结合某后注浆工程,通过竖向静载试验对比,分析注浆与未注浆的钻孔灌注桩承载力性能及沉降规律,给同类工程提供有益的参考。桩端后注浆不但提高桩端阻力,还使桩侧摩阻力提高,并降低桩的变形量。注浆压力是在一定范围内变化的值,最大注浆压力随时间增大。桩间距较小或布桩集中的桩基应做现场试验确定注浆参数。

Based on a post-grouting engineering and comparisons of static loading tests （some is post-grouted and the other not） . The author analyzed the laws of bearing capacity and settlement, then provided some beneficial references to similar engineering. Post-grouting can increase the bearing capacity of the side and bottom resistance, decreases the settlement of pile effectively. The grouting pressure is a changing value within certain limits, the maximum grouting pressure become greater as time changes. The piles are harder post-grouted and with more grouting pressure. The parameter of these piles should be en sured by field experiments.