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多年冻土路基冻融沉陷(以下简称融沉)已成为青藏公路的主要病害,针对冻土路基融沉产生的原因,本文总结分析了三类致灾因子对青藏公路路基融沉的影响,提出单因素致灾因子等级评价标准及融沉危险度等级划分标准,基于层次分析法和模糊综合评价法对多年冻土路基融沉进行评价。以青藏公路K3020~K3030段为例,采用层次分析法建立多年冻土路基融沉评价模型,确定各致灾因子的权重系数,并结合模糊综合评价法求得融沉危险系数,进而确定该路段融沉危险等级。结果表明:该路段融沉危险度等级为二级,与实际道路情况基本吻合,因此基于模糊层次分析法的评价模型结果可靠,具有一定的实用性。
The permafrost subsidence thawing and thawing (hereinafter referred to as thawing and thawing) has become the main disease of the Qinghai-Tibet Highway. In view of the reasons for the thawing of permafrost subgrade, this paper summarizes the impact of the three types of hazard factors on subgrade thawing of the Qinghai-Tibet Highway, The evaluation criteria of single factor hazard level and the division standard of thawing sink risk level, the thawing settlement of permafrost subgrade is evaluated based on AHP and fuzzy comprehensive evaluation. Taking K3020 ~ K3030 sections of Qinghai-Tibet Highway as an example, AHP model of permafrost subgrade was set up by AHP to determine the weight coefficient of each hazard coefficient, and the fuzzy comprehensive evaluation method was used to find the risk factor of thawing settlement, Thaw the level of danger. The results show that the grade of thaw sinking is two levels, which is basically consistent with the actual road conditions. Therefore, the evaluation model based on fuzzy analytic hierarchy process is reliable and has certain practicality.