桩底注浆技术的应用及注浆效果的实测分析

APPLICATION OF INJECTION PROCESS FOR INCREASING BEARING CAPACITY OF BORED PILE WITH CASE STUDY

在介绍了钻孔灌注桩桩底注浆施工工艺和技术特点的基础上 ,分析了某工程 4根大直径钻孔灌注桩采用桩底注浆提高承载力的效果。通过注浆前后的桩身应力实测表明 ,注浆以后桩底承载力得到了很大提高 ,桩底位移减小 ,而桩侧阻力变化程度较小。

This paper describes the technique of the injection process for soil in the pile toe to increase the bearing capacity of a bored pile. The results of in situ measurements for two bored piles before and after injection, two bored piles after injection, are presented in detail. It is found that the ultimate capacity of the piles was greatly increased after injection. The bearing capacity of the soil in the pile toe was also greatly increased, which was not found in the shear resistance of the soil around pile shaft.