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根据相似理论,以曲墙式、直墙式和圆形衬砌为例,通过模型试验方法研究了寒区破碎岩体隧道在不同约束条件和冻结深度下衬砌所受法向冻胀力(以下简称冻胀力)的量值和分布规律.结果表明:冻结深度越大,冻胀力越大;顶端约束越强,冻胀力越大.对于曲墙式和直墙式衬砌,顶端约束对拱部和仰供处冻胀力影响较大,对边墙处冻胀力影响较小;对于圆形衬砌,顶端约束对整个衬砌所受冻胀力影响程度相差不大;直墙式衬砌受冻胀力的量值最大,圆形衬砌受冻胀力量值最小.对于3种衬砌结构,最大冻胀力均发生在仰供脚处.试验数据与现场测试数据基本吻合,说明试验有较好的准确性.
According to the similarity theory, taking curved wall, straight wall and circular lining as an example, the normal frost heaving force of tunnel under different constraints and freezing depth is studied by the model test method (hereinafter referred to as The results show that the larger the freezing depth is, the larger the frost heaving force is. The stronger the top restraint is, the larger the frost heaving force is. For curved wall and straight wall lining, the top restrains the arch For the circular lining, the influence of the top constraint on the frost heaving force of the lining is similar to that of the liner; the straight-wall lining is affected by frost heaving force, The maximum value of the expansion force and the minimum value of the frost heave force for the circular lining are shown in Table 1. The maximum frost heaving force of the three kinds of lining structures occurred at Yang-Feel Feet.The experimental data are in good agreement with the field test data, indicating that the test has good accuracy.