Sections of double layer compound liner test of second-line terminal tunnel for Baoji–Lanzhou railwag are modeled and analyzed by using ANSYS software

safety factors of the surrounding rock are calculated by strength reduction finite element method

and safety factors of the liner are calculated by applying finite element method based on the combined effect of soil and structure. The loess tunnel design must meet the two stable requirements: according to the preliminary proposals

the safety factors of the surrounding rock can’t be less than 1.15 to 1.2; at the same time

the safety factors of the initial liner can’t be less than 1.3 after the initial support; the safety factors of the liner are greater than 2.0 to 2.4 after the second liner so that the construction and operation security can be ensured. Evaluating and analyzing the safety factors of the surrounding rock and the liner

quantitative methods of designing loess tunnel support structure are formatted.