Plastic deformation behaviour of graded crushed stone (GCS) base affects the service life of flexible pavement. This paper presents a simple prediction model to characterize the plastic deformation behaviour of GCS base. A relative deformation model was proposed based on the deformation model developed by Pérez. The plastic deformation test was conducted using a rutting tester under different moisture contents, test times, aggregate gradations and load stresses, respectively. The model coefficients were calibrated, and the model was validated by comparing the measured value and predicted value of relative deformation under different test conditions. The plastic deformation model for GCS base, based on the relationship between relative deformation and plastic deformation ratio, was ultimately determined by taking a standard stress of 0.7 MPa and the plastic deformation of GCS in the 60th min corresponding to this stress as the reference standard. The correlation coefficient ( R 2 > 98%) indicates that the developed model has a desirable prediction accuracy. The developed model can be used to predict the plastic deformation of GCS base, evaluate its plastic deformation performance and provide support for highway maintenance management.

中文翻译：

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柔性路面级配碎石基层塑性变形简易预测模型

级配碎石（GCS）基层的塑性变形行为影响柔性路面的使用寿命。本文提出了一个简单的预测模型来表征 GCS 底座的塑性变形行为。基于Pérez开发的变形模型，提出了相对变形模型。塑性变形试验分别在不同含水量、试验时间、骨料级配和载荷应力下使用车辙试验机进行。对模型系数进行标定，通过比较不同试验条件下相对变形的实测值和预测值对模型进行验证。GCS底座的塑性变形模型，基于相对变形与塑性变形率之间的关系，最终以标准应力为0确定。7 MPa 和 GCS 在第 60 分钟的塑性变形对应于该应力作为参考标准。相关系数 (R 2 > 98%) 表明开发的模型具有理想的预测精度。所建立的模型可用于预测GCS基层的塑性变形，评价其塑性变形性能，为公路养护管理提供支持。