Correlation of Crossriver Shield Tunnel Between Longitudinal Deformation Curvature and Segment Leakage

Abstract:

Applicability and calculation method of cubic spline interpolation in longitudinal deformation curve fitting of crossriver shield tunnel were analyzed,and longitudinal deformation curve of crossriver shield tunnel was fitted by using cubic spline interpolation method,and longitudial deformation curvature of whole tunnel was calculated by curve fitting equation.Based on longitudinal structure analysis model of crossriver tunnel,relationship under different critical states between longitudinal deformation curvature and circular seam stretchingamount was built.Correlation between longitudinal deformation curvature of crossriver tunnel and circular seam leakage was evaluated,by comparing leakage detection results of crossriver tunnel on site.The results show that critical curvature radius value of crossriver shield tunnel is smaller than metro shield tunnel.When longitudinal deformation curvature radius of crossriver tunnel is less than 2407.1m and its circular seam stretchingamount is more than 3mm,the probability that leakage occurs to the circular seam is relatively high.When longitudinal deformation curvature radius of crossriver tunnel is less than 1 256.8m and its circular seam stretchingamount is more than 6 mm,water sealing measures of circular seam is invalid,and serious leakage may appear in tunnel.

Key words:crossriver tunnel; longitudinal deformation; curvature radius; circular seam stretchingamount; segment leakage