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关于土坡稳定性分析中的分项系数取值的讨论

张宁, 李旭, 储昭飞, 刘保国

张宁, 李旭, 储昭飞, 刘保国. 关于土坡稳定性分析中的分项系数取值的讨论[J]. 岩土工程学报, 2016, 38(9): 1695-1704. DOI: 10.11779/CJGE201609017
引用本文: 张宁, 李旭, 储昭飞, 刘保国. 关于土坡稳定性分析中的分项系数取值的讨论[J]. 岩土工程学报, 2016, 38(9): 1695-1704. DOI: 10.11779/CJGE201609017
ZHANG Ning, LI Xu, CHU Zhao-fei, LIU Bao-guo. Optimum values of partial factors in stability analysis of soil slopes[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(9): 1695-1704. DOI: 10.11779/CJGE201609017
Citation: ZHANG Ning, LI Xu, CHU Zhao-fei, LIU Bao-guo. Optimum values of partial factors in stability analysis of soil slopes[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(9): 1695-1704. DOI: 10.11779/CJGE201609017

关于土坡稳定性分析中的分项系数取值的讨论  English Version

基金项目: 国家重点基础研究发展计划(“973”计划)项目(2012CB026104); 国家自然科学基金项目(51479001); 中央高校基本科研业务费项目(2014JBZ013)
详细信息
    作者简介:

    张 宁(1993- ),男,硕士研究生,主要从事边坡可靠度分析方面研究。E-mail: 14121147@bjtu.edu.cn。

    通讯作者:

    李旭,E-mail:cexuli2012@163.com

  • 中图分类号: TU43

Optimum values of partial factors in stability analysis of soil slopes

  • 摘要: 基于可靠度理论的分项系数法已在结构工程设计中广泛应用,并成为当前岩土工程设计方法发展的一种趋势。针对土质边坡抗剪强度参数(凝聚力c和摩擦系数f)的分项系数取值进行讨论:首先结合条分法、响应面法以及设计域的概念,在不同工况下标定分项系数的取值;然后评估,在采用不同分项系数组合进行边坡设计时,实际边坡的可靠度水平。研究结果表明:①变异系数对分项系数的标定有重要影响;②减小分位比能够部分抵消一定目标可靠度下由变异系数所引起的分项系数标定值变化以及一定分项系数下实际边坡可靠度水平的波动;③设计验算点是设计域中特殊的一点,它并不是最优的设计值取值点,使用标准化空间里设计域上特定角度一点作为设计值取值点更具优势;④当分位比为0.1,目标可靠度3.2时,经过优化分析,推荐土质边坡分项系数取值为=1.30,=1.15;⑤使用该方法,可以对现有安全系数设计方法的可靠度水平进行评估。
    Abstract: The partial factor method is widely used in the design of structural engineering and tends to be developed in the design of geotechnical engineering. The optimum values of partial factors used in the stability analysis of soil slopes are discussed. First, the traditional slice method, the response surface method and the concept of design space are combined to calibrate the partial factors. Then, several groups of partial factors are used to design the soil slopes with variable shear strength parameters and geometrical shapes. The actual reliability levels of these designs are checked and used to optimize the selection of partial factors. The results demonstrate that: (1) The coefficient of variation strongly affects the calibration of partial factors; (2) The decrease of fractile ratios can reduce the variation of the calibrated partial factors and the real reliability levels of soil slopes designed by the partial factor method; (3) Instead of the design checking point, a point with certain degree in the design location is recommended for the calibration of partial factors; (4) When the target reliability index is 3.2 and the fractile ratio is used as 0.1, the partial factors γc=1.30 and γf = 1.15 are recommended in the design of soil slopes. (5) Using the proposed method, the real reliability levels of the soil slopes designed by the factor of safety method can be evaluated.
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出版历程
  • 收稿日期:  2015-02-12
  • 发布日期:  2016-09-24

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