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首页> 外文期刊>The international journal of pavement engineering & asphalt technology >VARIABILITY IN PAVEMENT DESIGN
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VARIABILITY IN PAVEMENT DESIGN

机译：路面设计的可变性

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This paper presents the results of a review on variability of key pavement design input variables (asphalt modulus and thickness, subgrade modulus) and assesses effects on pavement performance (fatigue and deformation life). Variability is described by statistical terms such as mean and standard deviation and by its probability density distribution. The subject of reliability in pavement design has pushed many highway organisations around the world to review their design methodologies, mainly empirical, to move towards mechanistic-empirical analysis and design which provide the tools for the designer to evaluate the effect of variations in materials on pavement performance. This research has reinforced this need for understanding how the variability of design parameters affects the pavement performance. This study has only considered flexible pavements. The sites considered for the analysis, all in the UK (including Northern Ireland), were mainly motorways or major trunk roads. Pavement survey data analysed were for Lane 1, the most heavily trafficked lane. Sections 1km long were considered wherever possible. Statistical characterisation of the variation of layer thickness, asphalt stiffness and subgrade stiffness is addressed. A sensitivity analysis is then carried out to assess which parameter(s) have the greater influence on the pavement life. The research shows that, combining the effect of all the parameters considered, the maximum range of 15th and 85th percentiles (as percentages of the mean) was found to be 64% to 558% for the fatigue life and 94% to 808% for the deformation life.
机译：本文介绍了关键路面设计输入变量（沥青模量和厚度，路基模量）变化的综述结果，并评估了对路面性能（疲劳和变形寿命）的影响。变异性是通过统计术语（例如均值和标准差）及其概率密度分布来描述的。路面设计中的可靠性问题已促使世界各地许多公路组织对其设计方法（主要是经验方法）进行审查，以转向机械-经验分析和设计，这为设计师提供了评估材料变化对路面影响的工具。性能。这项研究加强了这种对理解设计参数的可变性如何影响路面性能的需求。这项研究仅考虑了柔性路面。整个英国（包括北爱尔兰）考虑进行分析的站点主要是高速公路或主要干道。分析的路面调查数据涉及第1车道，即最繁忙的车道。尽可能考虑1公里长的路段。统计层厚度，沥青刚度和路基刚度变化的统计表征。然后进行敏感性分析，以评估哪些参数对路面寿命具有更大的影响。研究表明，综合考虑所有参数的影响，发现疲劳寿命的第15和第85个百分位数的最大范围（平均值的百分比）为64％至558％，而疲劳寿命的最大范围为94％至808％。变形寿命。

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