加筋土边坡稳定分析安全判据和标准研究  

Appraisal of Safety Criteria and Standards for Stability Analysis of Geotextile Reinforced Slopes

作　　者：陈祖煜[1,2,3] 章吟秋[1,2] 宗露丹 韩黎明 詹成明 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [3]中国水利水电科学研究院岩土工程研究所,北京100048 [4]中国民航机场建设集团公司,北京100101 [5]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《中国公路学报》2016年第9期1-12,共12页China Journal of Highway and Transport

基　　金：国家重点基础研究发展计划("九七三"计划)项目(2014CB047000)

摘　　要：为了研究加筋结构稳定分析的安全判据和相关标准,基于库仑理论计算加筋土边坡安全系数的方法,将可靠度理论应用于目标可靠度指标为3.7、允许安全系数为1.34(较未加筋边坡的规范值略高)的一个典型算例中;并假定黏聚力c、摩擦因数f和筋材强度T的变异系数分别为0.2,0.1和0.07,获得其分项系数标定值为γc=1.38,γf=1.26和γT=1.05。基于相对安全率的概念,通过改变坡高、坡度和其他材料参数对上述标定值进行普适性论证;并采用承德机场工程实例对标定值进行了验证。结果表明:分项系数的标定值与国内外相关规定接近;普适性论证中良好的回归结果证明标定的允许安全系数和分项系数值与对应的可靠度指标具有同一风险控制标准;特别需要指出的是,随着坡度的增加相应安全指数的变化是平稳的,因此人为地将结构分类为墙或边坡是没有必要的。To investigate the safety criteria and the related standards for stability analysis of geotextile reinforced structures,based on the Coulomb＇s theory to calculate the factor of safety for geotextile reinforced slopes,the theory of reliability analysis was applied on a typical example with a specified reliability index of 3.7and allowable factor of safety of 1.34（slightly higher than those required by codes for ordinary slopes）.Given the coefficients of variability for cohesion c,friction fand geotextile strength T,which are 0.2,0.1and 0.07 respectively,the calibrated partial factors that wereγc =1.38,γf=1.26 andγT =1.05 respectively were obtained.Furthermore,the applicability of the calibrated indices was investigated through the actualengineering project of Chengde airport slope.The results show that the calibrated partial factors are close to the related Chinese and overseas specifications,and the good regressions,obtained in all these circumstances,demonstrate that the calibrated allowable factor of safety and partial factors have the same risk control standards with corresponding reliability indexes.In particular,it is found that there exists a smooth transmission regarding all the calculated safety indices when the slope gradient becomes steeper.Therefore,it is unnecessary to divide the structures into wall or slope subjectively.

关 键 词：道路工程 加筋土边坡 可靠度分析 相对安全率 分项系数 安全系数 

分 类 号：U417.11[交通运输工程—道路与铁道工程]