Abstract: This paper presents the rotary drilled, castinplace concrete pile installation techniques in the complicated karst rock formations. The common quality hazard during the pile installation and their remediation measures are discussed with an aim of improvement quality and efficiency of the concrete piles in karst formations.

Key words: Rotary Drilled； Cast-in-Place Concrete Piles, Steel Casing, Complicated Rock Cavities, Fissured Rock Formation