Abstract:

"Bored piles + waterstopping curtain" retaining system is applied in the construction of the ventilation shaft on Island A in Jinji Lake. The design of the retaining system applied in the superdeep foundation pit in soft soil under complex environment conditions, as well as the application conditions and waterstopping effect of the jet grouting piles and mixing piles are analyzed. The safety and reliability of the retaining structure of the foundation pit and the reinforcement of the end of the shield launching/arriving shaft are guaranteed. In the end, the shield passes the ventilation shaft successfully.

Key words: soft soil, superdeep foundation pit, soldier pile, watervstopping curtain, jet grouting pile, mixing pile