Study on numerical analysis and monitoring of deformation of shield-driven deep foundation pit enclosure structure cuted directly

As an important construction link of shield tunnel, shield-driven maybe lead to risk. Particularly as a new construction technology, it is so necessary to adequately research the design parameters of enclosure structure cut by shield machine directly. Based on subway engineering, the deformation of enclosure structure composed of GFRP pile is researched. By numerical analysis and monitoring in-site, the deformation of GFRP pile and ground settlement in the process of excavation of deep shield-driven pit is analyzed. The variation characteristics of deformation of GFRP pile and ground settlement are concluded. By the comparative analysis, the horizontal displacement of GFRP pile is more than that of reinforced concrete pile. The GFRP pile meet the requirement of excavation safely and cutting directly. In a word, GFRP piles are applied in shield-driven pit successfully. It may be useful for similar engineering in future. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.