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首页> 外文会议>E-proceedings of first international conference on transport infrastructure >INFLUENCE OF SLAB THICKNESS VARIATION ON BACKCALCULATION OF CONCRETE PAVEMENT PROPERTIES
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INFLUENCE OF SLAB THICKNESS VARIATION ON BACKCALCULATION OF CONCRETE PAVEMENT PROPERTIES

机译：板厚变化对混凝土路面性能反算的影响

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摘要

It is possible that errors in backcalculated concrete pavement properties could be contributed by the inability to consider factors such as temperature warping, slab thickness variability and defects, etc. In the case of slab thickness, a representative design thickness is generally used as input data in the backcalculation analysis. This research was intended to evaluate the influence of slab thickness on the accuracy of backcalculated concrete pavement properties. For this purpose, the pavement slab modulus and modulus of subgrade reaction, as well as the slab thickness were taken as the unknown properties in the backcalculation analysis. The performance of the results was obtained by comparing the backcalculated pavement properties with the measured ones obtained from the LTPP database. Initial pavement layer moduli, generated using a closed-form backcalculation program, NUS-BACK, were used as seed moduli for the search for the best match of computed and measured deflections. A search method developed based on the genetic algorithm (GA) theory is employed for the backcalculation analysis. The results showed that the choice of slab thickness has no statistically significant effect on the backcalculation of the modulus of subgrade reaction. It is concluded that the representative design slab thickness can be used in backcalculation analysis without causing practically significant errors in the backcalculated concrete pavement properties.
机译：由于无法考虑温度翘曲，板坯厚度变化和缺陷等因素，可能导致反算混凝土路面性能的误差。在板坯厚度的情况下，通常使用代表性设计厚度作为输入数据。反算分析。这项研究旨在评估板厚对反算混凝土路面性能精度的影响。为此，在反算分析中将路面板模量和路基反应模量以及板厚作为未知特性。通过将反算的路面性能与从LTPP数据库获得的实测路面性能进行比较，可以获得结果的性能。使用封闭形式的反算程序NUS-BACK生成的初始路面层模量用作种子模量，以寻找计算和测量的挠度的最佳匹配。基于遗传算法（GA）理论开发的搜索方法用于反算分析。结果表明，平板厚度的选择对路基反应模量的反算没有统计学意义的影响。结论是，可以将典型的设计板厚度用于反算分析，而不会在反算混凝土路面性能上造成实际上显着的误差。

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