冻土隧道冻胀力室内模型试验研究

详细地介绍了曲墙式、直墙式和圆形断面隧道衬砌在约束条件、隔热保温层及含水状况等因素变化情况下的相似材料冻胀力室内模型试验，通过分析试验得出不同衬砌断面在各种因素影响下衬砌和围岩间冻胀压力的量值和分布特征，以及由冻胀压力引起的结构内力分布特征。研究表明，直墙式断面受冰胀力最大，曲墙式次之，圆形面最小；曲墙式、直墙式断面冻胀力均呈分布荷载形态，前者拱脚及仰拱脚处冻胀力最大，后者边墙、底板处冻胀力最大。

Experimental research on frost-heave force of tunnel in frozen earth region

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.