1. Guangzhou Subway Design and Research Company, 510010, Guangzhou China； 2.College of Civil Engineering,
Shandong University of Science and Technology, 266510, Qingdao， Shandong， China
Abstract：
During extracting construction of abandoned piles in Nanjing subway line 2 phase I engineering, lagging pile pore forming antifriction method and steel wire lagged broken pile method are adopted according to the working principle of pile extracting construction, pile breaking reason and treatment method during pile extracting. The methods are not limited by the form and diameter of pile and it has been proved in practice that they have favorable effect.
