Abstract: Through the cleaning the sediment at the bottom of the bored piles and grouting treatment, the bearing behavior can be improved so that it can take the design load. Due to geological conditions, construction methods and other factors, the bored and cast-in-place concrete piles are prone to accumulate thick sediment at the bottom of the borehole. The load settlement (Q～S) curve of the static load test shows a steep drop type, the total settlement is too large, and the bearing capacity generally cannot meet the design requirements. Through the pile top drilling, high-pressure water flushing and waste removal, combined with pile end grouting to produce compaction, condensation, and consolidation effects, improve the axial bearing characteristics at the pile end, improve its strength and stiffness, reduce the settlement at the pile end and improve the axial bearing capacity of a single pile. Therefore, the comparison of the axial bearing characteristics of the pile end before and after the test can significantly improve the axial bearing characteristics of the pile end.

Key words: Sediment and Bottom, Pile End Grouting, Coring Method, Static Load Tests