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A multi-index coupling system of ice slope stability and its application

Research in Cold and Arid Regions 2012年第3期4卷 185-194页

作者： WanSheng Pei YuanMing Lai MingYi Zhang HongYu Xu Wu Chen State Key Laboratory of Frozen Soil Engineering Cold andArid Regions Environmental Engineering Research InstituteChinese Academy of SciencesLanzhouGansu 730000China

Based on the Simplified Bishop Method, the minimum safety factor of ice slope both with and without tension cracks is calculated in combination with triaxial compression tests. It is found that there exists a critical depth for each crack. Then, factors influencing ice slope stability such as slope ratio, slope height, ice cohesion, internal friction angle, unit weight and temperature were analyzed. Meanwhile, a regression equation between the aforementioned factors and safety factor is obtained, with which sensitivity analysis is carried out. The performance function is built in combination with random distribution of physical and mechanical parameters to analyze the reliability index. The Advanced First Order Second Moment Method is employed on the solution to the perfor- mance function. The one-way coupling system of ice slope stability is therefore formed based on safety factor and reliability index. Finally, an illustrated example of ice slope is provided, which shows that failure probability is relatively high, up to 6.18%, alt- hough safety factor is 2.77. Thus, it is objective and reasonable to apply the coupled system method to the slope stability rating.

关键词： ice slope stability safety factor sensitivity analysis reliability index Advanced First Order Second Moment Method

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