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摘要: 考虑可靠性分析中结构极限状态变量在零值附近的模糊区间, 建立边坡稳定性模糊随机可靠度分析模型。研究了在土性参数变异性、模糊失效概率隶属度函数梯形与岭形分布类型情况下, 模糊区间宽率与偏度对模糊可靠指标的影响。分析结果显示: 偏度与可靠性指标曲线的斜率随宽率的减小而减小, 且其趋势与参数变异性与模糊失效概率隶属度函数类型无关; 对于宽率的某一确定值而言, 偏度的增大会导致模糊可靠指标的降低; 土性参数变异性的增加会导致模糊可靠指标的降低。Abstract: The fuzzy interval of limit state variable near its zero value was considered, ana a moael of fuzzy-random reliability analysis of slope stability was put forward. The influences of width fraction and migration fraction on the fuzzy reliability index of slope stability were studied in different situations including the variability of common soil parameters and the membership function distribution of fuzzy failure probability. Analysis result indicates that the slope of migration fraction and fuzzy reliability index curve decreases with the decrease of width fraction, which is irrelated to the variability and the distribution. For a certainty value of width fraction, the fuzzy reliability index decreases with the increase of migration fraction. The increase of the variability of soil parameters results in the decrease of the index. 3 tabs, 4 figs, 7 refs.
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Key words:
- slop /
- parameter variability /
- fuzzy-random reliability /
- reliability index
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表 1 变异系数取值范围
Table 1. Ranges of variation factors
表 2 例1计算结果
Table 2. Calculation result of example 1
表 3 例2计算结果
Table 3. Calculation result of example 2
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