Abstract: This paper presents an innovative deep excavation support system: "dam shaped bamboo soil nails and soldier piles for the excavation support". This method is replacing the high energy consumption steel reinforcement bars with environment friendly bamboo bars. The bamboo bars can also be used as soldiers in supporting the excavations. The dam shaped bamboo soil nail distribution can be used to replace the conventional soil nails with equal nail length or longer nails at top with shorter nails at bottom. The stressstrain analysis on bamboo bars, the insitu pull out tests and numerical analysis have been performed. It is concluded that the application of the bamboo bars in the deep excavation support is appropriate. The bamboo bar can also serve as a casing to guide the grout slurries to the greater depth of the nail; therefore, safety factors of the excavation supporting system can be enhanced.

Key words: Dam Shaped, Bamboo Soil Nail, Bamboo Soldier Piles, Deep Excavation Supporting System