建立在相对安全率准则基础上的岩土工程可靠度分析与安全判据

doi:10.13722/j.cnki.jrme.2017.1302

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摘要各国规范普遍规定采用一次二阶矩法标定结构可靠度分析的安全指标。欧洲规范称其为“Level II”。为验证针对一个特定算例在目标可靠指标基础上标定的安全指标的普遍适用意义，提出“相对安全率”这一判据。简要回顾了使用一次二阶矩法计算相应目标可靠指标的允许安全系数和分项系数的原理和方法，然后改变被考核的算例的几何特征和岩土力学参数，要求“相对安全率” ，，互相接近( 为相对安全率，下标R，F，P分别定义可靠指标、安全系数、分项系数3个领域的相应参数)。根据Level II标定的安全指标如能通过此普适性检验，则在工程实践中可以得到较广泛的认可。同时，回顾了这一方法在土石坝、加筋边坡、挡土墙、混凝土重力坝和拱坝的抗滑稳定分析中成功应用的研究成果，并对标定的结果做了总结。

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	陈祖煜

关键词 ：岩土工程, 可靠度分析, 可靠指标, 安全系数, 分项系数, 相对安全率

Abstract：Calibrating safety criteria by the First Order Second Moment Method is a standard approach specified in codes. EuroCode I refers it as the‘Level II approach’. This paper presents a criterion called‘Ratio of safety margin’that is used to assess the universal applicability of a calibrated safety criteria based on the target reliability index. Following a brief review of the theoretical background described in the existing codes，the author calibrated the equivalent factors of safety and partial factors based a target reliability index on a selected test example by the First Order Second Moment Method. The calibrated safety criterion was then examined by varying all the related geometrical and physical parameters of this selected example，making sure that the values of ?R，?F，and ?P are approximately same. Formulations have been given for defining the‘Ratio of safety margin’designated ? for reliability index，factors of safety，and partial factors with subscripts R，F，P respectively. Having passed this universal applicability test，the calibrated values have been promoted for practical application with more confidence. The author reviews its successful applications in the area of stability analysis for embankment dams，reinforced slopes，retaining walls，and concrete gravity and arch dams. The author summarizes the calibrated acceptable factors of safety and partial factors in these areas associated with the required reliability indices.

Key words： geotechnical engineering reliability analysis reliability index factor of safety partial factor ratio of safety margin

引用本文:

陈祖煜. 建立在相对安全率准则基础上的岩土工程可靠度分析与安全判据[J]. 岩石力学与工程学报, 2018, 37(3): 521-544.
CHEN Zuyu. Reliability analysis and safety criterion in geotechnical engineering based on the index of safety margin. , 2018, 37(3): 521-544.

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