The equivalent frost-heave force model experiment of tunnel in frozen earth region including lining types of bending wall

straight wall and rotundity and considering influencing factors consist of constraint conditions

thermal insulation material and containing water status etc.

are described in detail. Distribution characteristics and quantity value of frost-heave force around the tunnel lining and structural internal force caused by frost-heave force

are obtained by analyzing the experimental results. Comparing with the magnitude of frost-heave force of three lining sections

the frost-heave force value of straight wall lining section is greatest

the value of rotundity section is smallest

the value of bending wall lining section is middle of them. The frost-heaving force distribution characteristic of bending-wall lining section and straight wall express distributing load configuration

the greater value of the former occurs on arch foot and inverted arch foot

the greatest value of the latter occurs on side wall

the quite greater force on walls and bottom board is disadvantage for lining structure.