Deformation and Control of Box Tunnel Caused by Shield Tunnel Small Angle Oblique Underpass in Soft Soil Areas
Based on the engineering background of the Tianjin Metro Line 4 shield tunnel underpass the existing open-cut box tunnel of Tianjin Metro Line 1 at a small angle and close distance,the vertical and horizontal displacements of the existing tunnel during the construction were analyzed,and and the control measures were studied.The results show that,the longitudinal settlement curves of existing tunnel caused by the left and right lines of the shield tunnel underpass are V-shape and U-shape respectively.The settlements caused by the right line(the later line)are greater than that caused by the left line.Compared with the double shield tunnels orthogonal underpass the existing tunnel engineering,the settlement trough width of the longitudinal settlement curve of the existing tunnel caused by small angle underpass is significantly increased.With shield tunneling,the direction of horizontal displacement of existing tunnel changes from opposite to the direction of shield tunneling to along the direction of shield tunneling.Secondary grouting has a good effect on controlling the vertical and horizontal displacement of existing tunnel.
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