A stochastic approach on modeling the long-term unevenness of pavements considering spatially varying soil properties/Ein stochastischer Ansatz zur Modellierung der langfristigen Entwicklung von Fahrbahnunebenheiten unter Berücksichtigung räumlich variierender Bodeneigenschaften

IF 0.4 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Bauingenieur Pub Date : 2023-01-01 DOI:10.37544/0005-6650-2023-10-54
Jürgen Grabe, Anne Hagemann
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Abstract

Even within nominally homogenous soil layers, spatial variations of soil properties occur. Current design methods simplify varying soil properties by applying constant values. In order to achieve a reliable geotechnical design, the local variance of soil properties needs to be considered with respect to the long-term development of road unevenness. Hence, a variation of soil stiffness leads to spatially varying settlements and increasing dynamic forces on passing vehicles as time increases. This process continues steadily resulting in a noticeable reduction of driving comfort until a repair of the pavement is required. In this paper, a numerical model is applied to determine the long-term unevenness of pavements considering the spatial variation of soil properties. Thereby, the asphalt pavement, the subbase, and the subgrade are modeled by a set of coupled spring elements representing the soil behaviour of the respective layer. A stochastic distribution of soil properties based on a random walk is assumed to account for the spatial variation of the subsoil stiffness. The long-term unevenness development due to passing vehicles is extensively evaluated with respect to resulting dynamic forces and the impact of a deviating soil stiffness in individual soil layers. Finally, conclusions with respect to driving comfort are drawn.
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为基于不同地面属性的长期人行道模拟方法(方法
即使在名义上均质的土层内,土壤性质的空间变化也会发生。目前的设计方法通过应用恒定值来简化变化的土壤性质。为了实现可靠的岩土工程设计,需要考虑土质的局部变化以及道路不均匀度的长期发展。因此,随着时间的增加,土壤刚度的变化导致了空间变化的沉降和通过车辆的动力增加。这个过程持续不断,导致驾驶舒适性显著降低,直到需要修复路面。本文建立了考虑土壤性质空间变化的路面长期不均匀度数值模型。因此,沥青路面、基层和路基由一组表示各自层的土壤行为的耦合弹簧元件来建模。假设基于随机游走的土壤性质的随机分布可以解释底土刚度的空间变化。由于过往车辆导致的长期不均匀发展被广泛地评估了所产生的动力和个别土层中偏离土壤刚度的影响。最后,得出了驾驶舒适性方面的结论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Bauingenieur
Bauingenieur 工程技术-工程:土木
CiteScore
0.90
自引率
16.70%
发文量
66
审稿时长
6-12 weeks
期刊介绍: Die Zeitschrift Bauingenieur bietet Aufsätze über Theorie und Praxis des konstruktiven Ingenieurbaus, der Mechanik, der Geotechnik und des Baubetriebs und Baumanagements. Darüber hinaus enthält die Zeitschrift Bauingenieur Berichte und Reportagen über interessante Bauausführungen und Bausanierungen im In- und Ausland, Baustofffragen und Bauinformatik.
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