Abstract:

A mechanical model for interaction among doubleline parallel shield tunneling and ground, foundation and structure of foundation of adjacent building is deduced and established by Sagaseta formula of longitudinal ground surface deformation, so as to study the influence of doubleline parallel shield tunneling on deformation and bending moment of adjacent frame building with shallow foundation. The results show that: 1) The bending moment of the frame building increases with the horizontal distance between building and shield boring face decrease; and it reaches peak when shield boring face reaches bottom center of building. 2) The restraining moment of beam end and bottom column to foundation increase with tilt of the building increase. 3) The influence of shield tunneling one line after another on the building is smaller than that of doubleline shield tunneling synchronously. The bending moment curve of building slowly turns into W shape from V shape with the distance between boring face of two line increase. 4) The authors suggest that the two tunnels should not be bored synchronously; and monitoring of the building should be strengthened.

Key words: doubleline parallel shield tunnel, frame building, shallow foundation, settlement, bending moment