The concept of time dependent reliability and the calculating model are proposed in this paper. In addition, the durability optimum design method based on reliability analysis is suggested also.
本文引入时变广义可靠度概念并建立相应的计算模式，提出了基于可靠性分析的耐久性优化设计方法。
Just as other structures, environmental effect perform an important role during the course of durability damages in tunnel lining, and it was not considered in traditional design method.
与其他建筑结构一样，隧道衬砌结构会因环境因素的侵蚀而产生耐久性损伤，从而影响使用寿命，这种环境损伤作用在传统隧道衬砌结构设计方法中未定量考虑。
Finally, the quantitative design method for the freeze proof durability of concrete is suggested, according to the present condition of the country.
根据我国的实际情况，初步探讨混凝土抗冻性定量化设计的方法。
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