Abstract: With the rapid development of construction industry, the application of rotary excavated concrete piles in the engineering projects is more and more popular. With the time, the installation technology becomes more and more mature. However, when drilling in the deep and saturated sand layers, the rotary excavated concrete pile construction often encounters with various problems and frequent accidents, and results in the increased construction cost and reduced efficiency. Combined with the problems encountered in the construction of deep foundation with a deep and saturated sand layer, the likelyhood of borehole caving zones were summarized through construction and the correspondent measures were implemented so that a large construction cost and schedule savings could be achieved.

Key words: Rotary Excavated Concrete Piles, Deep Saturated Sand Layer, Caving Zone, Distribution