混凝土预制板衬砌梯形断面渠道的冻胀破坏受力分析

为了探讨寒区混凝土预制板衬砌渠道的受力问题,该文经过大量的野外实地调查研究,总结了寒区混凝土预制板衬砌梯形渠道通常发生的冻害形式,同时分析了该衬砌结构发生冻胀破坏的机理。在此基础上,通过合理假设并运用力学基本理论提出了衬砌结构受冻胀破坏的力学模型,推导出渠坡衬砌板、渠底衬砌板最大内力计算公式,只要根据有关规范或试验确定了最大冻结力,混凝土预制板的内力即可求解;在理论推导的基础上,结合工程实践给出了判断衬砌结构发生冻胀破坏的3个准则。该研究可为今后的工程设计提供一定的理论依据。

Stress analysis of frost heave for precast concrete panel lining trapezoidal cross-section channel

In order to explore forces problem of frost damage forms of precast concrete panels lined canals in cold areas, the damage mechanism was studied based on the field observation and experiments. On this basis, with a reasonable assumption combined with the basic theory of mechanics, the lining structure by the frost heaving damage mechanics model was developed, formula of the maximum internal stress of the lining channel bottom board was developed. The maximum frost force was determined in accordance with the relevant specifications or experimental maximum freezing power, which could solve the internal stresses of the precast concrete panels. Three judgment criterions on the frost heaving damage of the structure in engineering practice were developed. The study provides references to the design of precast concrete panel lined trapezoidal cross-section channel in the cold areas.