季节冻土区刚性衬砌渠道温度、应力及冻胀变形场的计算

根据季节性冻土的特点,通过假设及简化后利用有限元方法对季节冻土区的渠道基土的冻胀及受力进行数值计算,获得渠基土及刚性衬砌层的温度、应力和位移变化情况,其中衬砌层的应力可作为季节冻土区的刚性衬砌层的结构设计或结构强度的验算的依据。本文计算的结果与实际工程中衬砌层较厚的刚性衬砌渠道的破坏类型符合,即在坡脚处产生裂缝,渠顶宽度变小的破坏情况;合适的材料本构关系及准确的力学和热力学等性质指标是用有限元方法获得较精确计算结果的保障。

Studies on Computational Method about Temperature,Stress and Frost Deformation of Rigid Lined Canal in Seasonal Frost Region

Based on the characteristic of seasonal frozen soil and suitable assumption and simplification,the numerical simulation about frost-upheaval,stress and temperature of the canal bed and the lining slate were carried out,so the temperature,the stress and the displacement of certain point in the canal bed or in the lining slate were determined.The result in the paper was suitable for the type of frost damage of the canal with thick rigid lined slate,whose crack occurred at the toe of slope and width of the top of canal became smaller.Moreover the suitable constitutive equation and the accurate value of mechanics and thermodynamics ensured the more accurate result of FEM.