Abstract:

In order to improve the accurate adjustment efficiency of longitudinal profile of metro line and avoid slope ultralimit of adjacent section after adjustment, the upper and lower limit line method is studied. The rail surface line, whose floating range of upper and lower limit lines is allowable, is established to carry out auxiliary slope adjustment; the longitudinal profile of metro line is optimized by synergistically adjusting the relationship among slope change point, vertical curve radius and upper and lower limit lines; and the method is applied to adjust the slope of longitudinal profile of Fuzhou Metro Line No. 2. The study results show that: (1) The method mentioned above can quickly judge whether the vertical line is transfinite or not during shield tunneling, determine the slope adjustment scheme and avoid repeated slope adjustment and checking. (2) The method can avoid slope adjustment ultralimit occurs in shieldbored section. (3) The successful application of the method to Fuzhou Metro Line No. 2 has shortened the adjustment scheme time and avoided shield stop risks.

Key words: metro, slope adjustment, upper and lower limit line method, line longitudinal profile design