Abstract: With a wide application of rotary drilling of cast-in-place concrete piles in the foundation construction projects, the insufficient axial capacity induced by the excessive deposition of drilling debris at the bottom of the borehole has attracted more and more attention. Based on the foundation construction inspection practice in Xiamen, this paper presents the drilling debris control method of rotary drilling of cast-in-place concrete pile from the following five aspects: application of casing for the borehole protection; borehole cleaning technology; tremie concrete pouring; postgrouting and quality control of site operation. By comparing the measured construction monitoring data, all the above measures are proved to be reliable and provide as references for future relevant projects.

Key words: Rotary Drilling Cast-In-Place Piles, Drilling Debris, Quality Control, Axial Capacity