Abstract:

During the jacking of large crosssection pipe curtain boxculvert, the instability of earth pressure on tunneling face often causes failure of pipe curtain system. As a result, an earth pressure balanced boxculvert tunneling machine is designed for jacking construction of Tianlin Road crossing underneath Central Ring Road in Shanghai. The design conditions and main parameters selection of boxculvert tunneling machine, stress analysis of shell structure and its application and effect are introduced. The results show that: (1) The balance of front earth pressure of boxculvert tunneling machine is conducive to surface settlement control. (2) The force analysis results of shell structure of boxculvert tunneling machine by SolidWorks 3D platform indicates that the structural design can fully meet the construction load conditions. (3) The attitude control of boxculvert tunneling machine mainly relies on the completed pipe curtain as guidance, and the deviation can be adjusted by synchronous jacking system. (4) The cutting blind area in the cutterhead configuration will cause excessive jacking force in the construction process of reinforcement area.

Key words: earth pressure balanced boxculvert tunneling machine, equipment parameters, force analysis, numerical simulation