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为探讨地震荷载下露天坑边坡的稳定性,结合可靠度分析方法及模糊数学理论对边坡工程的可靠度进行分析。以某露天坑边坡工程为例,利用拟静力法分析地震荷载下影响边坡工程可靠度的各个作用力,进而应用可靠度、模糊数学等理论对边坡工程进行可靠度分析,得到该边坡工程的随机失效概率为0.015 9,模糊失效概率为0.100 1。同时,对黏聚力c和内摩擦因数f的均值和方差进行敏感度分析,可知其取值的变化将对失效概率产生线性影响,其中模糊失效概率的敏感度较低,而随机失效概率的敏感度则相对较高。结果表明,模糊随机可靠度分析结果虽偏于保守,但它考虑不确定性因素的影响,更适用于大型工程的施工。
In order to discuss the stability of open pit slope under earthquake load, the reliability of slope engineering is analyzed with reliability analysis method and fuzzy mathematics theory. Taking a pit slope engineering as an example, the quasi-static method is used to analyze the various forces that affect the reliability of the slope engineering under the seismic load. Then the reliability analysis of the slope engineering is carried out based on the theory of reliability and fuzzy mathematics. The probability of random failure of slope engineering is 0.015 9 and the probability of fuzzy failure is 0.100 1. At the same time, the sensitivity analysis of mean and variance of cohesion c and internal friction coefficient f shows that the change of their values will have a linear effect on the failure probability, of which the sensitivity of fuzzy failure probability is low, while the probability of random failure probability Sensitivity is relatively high. The results show that although the fuzzy random reliability analysis results are conservative, it considers the influence of uncertainties and is more suitable for the construction of large-scale projects.