Abstract:Based on the combination of the transverse pipe curtain between the main line shield and the ramp shield with the freezing method, a new structure is built to construct a junction section between the two. In order to find a more reasonable connection curve, it is assumed that the corresponding equilibrium equation is derived under the ideal condition of no bending moment, and the optimal curve trajectory is judged to be a circular arc under the condition of frost heave. Finally, based on the practice of Shanghai Beiheng Channel Project, the optimal curve equation is established by selecting the scheme of the upper and lower ramps to the main line, which lays a foundation for the study of the overall stress of the structure.
