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Modeling to simulate inverted asphalt pavement testing: An emphasis on cracks in the semirigid subbase

机译：模拟倒置沥青路面测试的建模：强调山楂子基板的裂缝

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Typical inverted asphalt pavement (IAP) finite element (FE) models consider the semirigid subbase as an intact slab. Quarter IAP FE models with cracks in the subbase are developed to include the effect of cracks on pavement responses. To facilitate the model validation, heavy vehicle simulator (HVS) accelerated pavement testing (APT) and falling weight deflectometer (FWD) tests are conducted on four instrumented IAP test sections with transverse cracks sawed into the top of the subbase. The crack is simulated with cohesive elements, and the loading part geometry and dimension are determined by measuring the tire-pavement contact characteristics of the HVS dual-wheel carriage. The minimum mesh size of 0.01 m is specified in the convergence analysis. Dimension validity analysis results illustrate that the quarter model cannot represent the overlapping effect of the dualwheel loads along the depth direction. FWD tests simulation and P-value results of paired T-tests between the simulated and measured pavement responses indicate that the FE model developed in the study can replicate the actual pavement response well. The model is valid for the pavement testing simulation of IAP with cracks in the subbase.
机译：典型的倒置沥青路面（IAP）有限元（FE）模型将半成体子比例视为完整的板坯。开发了亚场裂缝的季度IAP FE模型，包括裂缝对路面反应的影响。为了便于模型验证，重型车辆模拟器（HVS）加速路面测试（APT）和下降的重量偏转仪（FWD）测试在四个仪器的IAP测试部分上进行，其中横向裂缝锯入子比级顶部。用粘性元件模拟裂缝，通过测量HVS双轮托架的轮胎路面接触特性来确定装载部分几何形状和尺寸。在收敛分析中规定了0.01米的最小网格尺寸。尺寸有效性分析结果表明，季度模型不能表示双轮载荷沿深度方向的重叠效果。 FWD测试模拟和测量路面响应之间配对T检验的仿真和P值结果表明，研究中开发的FE模型可以良好地复制实际路面响应。该模型适用于Subbase中具有裂缝的IAP的路面测试模拟。

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