铁路路堤边坡的可靠度设计方法研究  

Study on Design Method for Slope Reliability of Railway Embankment

作　　者：王仲锦[1] 吴敏敏[1] 程爱君[1] 骆文海[1] 

机构地区：[1]中国铁道科学研究院,北京100081

出　　处：《铁道工程学报》2013年第3期24-27,49,共5页Journal of Railway Engineering Society

基　　金：铁道部建设司工程规范科研项目(建技科字[2006]第3号)

摘　　要：研究目的:铁路工程结构正进行由安全系数向基于概率的极限状态设计的转变,铁路路堤也是其中重要结构之一,必须研究建立基于可靠度理论的设计方法。研究结论:导出功能函数。采用蒙特卡罗法和校准法对普通铁路路堤边坡标准断面进行分析计算,确定其目标可靠指标为2.3,探讨铁路路基目标可靠度的变化。计算分析出一套路堤分项系数以及设计表达式,进行边坡参数及其变异系数对分项系数影响的研究,分项系数变化大,在设计中解决这一问题有三种方法:根据变量参数,直接计算可靠度;采用分项系数的调整式对分项系数进行调整;考虑主要变量参数以及变异系数变化组合分区,采用不同分项系数。Research purposes： The railway engineering structure is being changed from the safety factor to the probability - based limit state design, so the study has to be done on the reliability theory - based design method for railway embankment that is one of the important structures. Research conclusions：The function was derived. The calculation was made for the standard section of the embankment slope of the ordinary railway with the Monte - Carlo method to make sure the target reliability index of the railway embankment was 2.3 for discussing the variation of target reliability index. A set of the partial coefficients and their expressions were obtained for studying the influences of the slope parameters and the their variations on the partial coefficient. There are following three resolutions on the big variation the partial coefficients in the design： Firstly, based on the variable parameters, the reliability is directly calculated. Secondly, the partial coefficient is adjusted with the adjustment formula. Finally, on considering the partition between the main variation parameters and the variation coefficient, the different partial factors are used.

关 键 词：重力式挡土墙 可靠度 蒙特卡罗法 可靠度指标 分项系数 

分 类 号：U213.11[交通运输工程—道路与铁道工程]