Abstract: The pipe pile has many advantages, such as low cost, fast construction, and less environmental pollution. In particular, the PRC pipe pile equipped with prestressed steel bars and ordinary steel bars is widely used in the deep excavation because of the high shear and flexural resistances. In response to the lateral squeezing problem during the construction of the pipe pile, combined with the deep excavation project in Zhuhai, a design program used cement mixed soil columns with PRC pipe pile inclusions in a sand layer area is introduced, the construction process, conditions of the excavation and the monitoring data have been analyzed. The results show that the pipe pile embedded in the triaxial mixed soil column can resolve the issues of the lateral squeezing in the soil caused by the construction and protect the surrounding environment and results in a safe excavation. It can also provide a valuable reference application of similar projects in the future.

Key words: Cement Mixed Soil Columns, PRC Pipe Piles, Deep Excavation, Seepage Cut-off Wall