Abstract: The influences of tunnel lining internal forces (bending moment, axial force and maximum tensile stress) on soil frost heave ratio, frozen ring thickness, lining thickness and rock elastic modulus were simulated, calculated and analyzed by use of finite element numerical model and then the relations between them were also analyzed. The results indicate that the free frost heaving ratios of surrounding rock affected tunnel lining moment, axial force and tensile stress significantly while tunnel lining moment had small influence on ground elastic modulus and tunnel lining internal forces were notably influenced by depth of frozen ring while lining thickness had relatively weak influence on lining internal forces. It is thus suggested that thermal insulation be provided in seasonably frost soil zone and grouting injected in certain area behind the lining.

Key words: tunnel engineering, frost heaving force, soil tunnel, influence factors:sensitivity

摘要： 运用有限元数值模拟，计算分析了隧道衬砌内力（弯矩、轴力、最大拉应力）对土体冻胀率、冻结圈厚度、衬砌厚度、围岩弹模的敏感度。研究表明：隧道衬砌弯矩、轴力及拉应力对围岩自由冻胀率均敏感；隧道衬砌轴力、拉应力对围岩弹模敏感，而隧道衬砌弯矩对围岩弹模的敏感度较小；隧道衬砌内力受冻结圈深度影响较为明显，而衬砌厚度对衬砌内力影响相对最弱。建议对于季节性冻土区隧道设置保温隔热层及在衬砌背后一定范围内的注浆。

关键词: 隧道工程, 冻胀力, 土质隧道, 影响因素, 敏感度