Permanent deformation modelling of large-size unbound pavement materials tested in a heavy vehicle simulator under different moisture conditions
Permanent deformation modelling of large-size unbound pavement materials tested in a heavy vehicle simulator under different moisture conditions
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在重型车辆模拟器中不同湿度条件下测试的大尺寸非粘合路面材料的永久变形建模
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
S. Erlingsson
中科院分区：
文献类型：
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作者：
M. Fladvad;S. Erlingsson
气候变化改变了路面设计所依据的环境条件，使经验设计方法失效。过渡到机械设计需要能够模拟路面材料在相关环境条件下的行为。加速路面试验（APT）的目的是测试两个仪器路面结构的水分条件下，这是改变地下水位（GWT）的提高。开级配和级配良好的底基层材料被用来调查级配对水分依赖性的影响。路面响应行为建模使用非线性弹性（NLE）的方法。用两种模型计算了不同湿度条件下路面永久变形的累积，并与实测路面车辙进行了比较。通过结构的水分输送因底基层级配而异。增加GWT加速了两种结构中永久变形的积累，这两种模型都确定了这一点。一个模型提供了一个显着更好的适合路基变形和车辙轮廓的宽度。
ABSTRACT Climate changes alter the environmental conditions which pavement design is based on, invalidating empirical design methods. Transition to mechanistic design requires the ability to model the behaviour of pavement materials under relevant environmental conditions. An accelerated pavement test (APT) is designed to test two instrumented pavement structures under moisture conditions which are altered by raising the groundwater table (GWT). Open-graded and well-graded subbase materials are used to investigate the effect of gradation on moisture dependency. Pavement response behaviour is modelled using a non-linear elastic (NLE) approach. Accumulation of permanent deformation under different moisture conditions is calculated by two models and compared to measured surface rutting. Moisture transport through the structures differs due to the subbase gradation. Increased GWT accelerates the accumulation of permanent deformations in both structures, identified by both models. One model provides a significantly better fit to the subgrade deformations and the width of the rutting profile.