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研究了开挖对承载力极限状态(ULS) 、正常使用极限状态(SLS) 和系统可靠度(SYS) 的影响,并基于开挖条件下承载力折减系数分别给出 ULS 可靠度指标、SLS 可靠度指标和 SYS 可靠度指标的计算方法. 研究得出 SLS 承载力和 USL 承载力的比值ξ对 SLS 可靠度和 SYS 可靠度有显著影响,并将这一比值的均值μξ当作随机变量,研究了 SLS 可靠度和 SYS 可靠度. 算例分析表明: 开挖深度和开挖直径对承载力折减系数和可靠度指标有显著影响; 随着开挖深度的增大,可靠度指标有很显著的减小; 当开挖深度较大时,开挖直径对可靠度指标的影响较大. 此外,μξ对 SLY 和 SYS 可靠度指标的影响很大,要更精确地估计μξ,需对μξ进行深入的研究.
The influence of excavation on ULS, SLS and system reliability (SYS) was studied. Based on the reduction factor of bearing capacity under excavation, the reliability of ULS, SLS Reliability index and SYS reliability index.The study shows that the ratio of SLS carrying capacity to USL carrying capacity has a significant effect on the reliability of SLS and SYS reliability.The mean μξ of this ratio is regarded as a random variable, The reliability of SLS and the reliability of SYS are studied.The example shows that the depth of excavation and the diameter of excavation have a significant influence on the reduction coefficient and the reliability index of bearing capacity.With the increase of excavation depth, And the excavation diameter has a great influence on the reliability index when the excavation depth is large.Moreover, μξ has a great influence on the reliability index of SLY and SYS. To estimate the μξ more accurately, Conduct in-depth research.