冻害是寒区隧道常见的工程病害，冻胀力是寒区隧道冻害发生的主要原因。因此， 研究冻胀力的发生、发展以及预防或消减是寒区隧道工程的关键问题，也是西部寒区工 程的热点和难点问题之一。 (1)对寒区隧道冻害问题的假说进行了归纳总结，对其各自的适用范围和局限性进行 了分析。 (2)介绍了软岩特殊的物理力学性质，对软岩热传导控制微分方程和蒲彦敲行了堆 导；对寒区隧道围岩塑性区的应力和边界进行了分析。：‘ (3)介绍了软岩的热物理指标，对寒区软岩弹性力学计算公式进行了推导；对粘弹性 情况下的冻胀力进行了分析；对弹塑性力学下的冻胀力进行了有限元分析。通过分析得 到：①冻胀力随洞内通风温度(外界温度)的降低而增大。②冻胀力随衬砌刚度分配的 原则。③冻胀力的分布规律。冻胀力大都分配于隧道的侧壁上，最大冻胀力形成于靠近 侧壁的中心部位。并给出了算例分析。 (4)根据流体力学、冻土学和传热学基本理论，提出了寒区隧道空气与围岩对流换热 和围岩热传导耦合问题的三维数学模型，并用迦辽金法对有限元计算公式进行了推导， 并进 考虑 隧道产生的根本原因，因此，在寒区隧道的设计计算中 ，通过建立寒区软岩支护设计模型，考虑冻胀力对寒区 软岩进行设计计算，并进行了算例分析。

Freezing damage is an common engineering disease，there are plenty of reasons cause the freezing damage，frost heaving force is the principal．Therefore，in the study of cold region rock tunnel，to avoid and reduce freezing damage，the key issue is to study the occurrence，expedience of the frost heaving force，and find out how to prevent these phenomenon．This paper have system study to frost heaving force． 1．Summarize the hypothesizes of the freezing damage，and give a detailed analysis of each advantages and disadvantages． 2．The governing differential equations are derived，which completely coupled the seepage field with the temperature field for phase change． · 3．In the governing differential equations of the seepage field，the influences of the porosity change by phase change between water and ice is investigated．QFrost heaving force is enlarging晰th the expedience of the wind temperature of the soft rock tunnel．②The changes of temperature field and the frozen collar are studied before and after coupling seepage field．③Summarized the law of frost heaving force’S distribution．Most scattered on the side ofsoft rock tunnel．The max power formed on the center of tunnel’S flank．And this page gives examples． 4．The seepage coefficient by phase change between ice and water is analyzed．The results indicate that the frozen collar get thinner after coupling seepage field than before．And the greater seepage coefficient，the thinner frozen collar．The frozen collar also gets thinning after coupling the phase change between water and ice． 5．The formula of freezing force for tunnel in the cold region is proposed．Then the analytical method for plastic zone boundary and stress are listed．And a calculating case is analyzed．The results show that tremendous freezing forces come．