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该文在研究现有路基工作区深度计算方法的基础上,根据对汽车行驶过程中动荷载变化规律的实际检测与分析,提出基于车辆动荷载影响下综合确定半刚性路面路基工作区深度的计算方法。进行室内试验采集冲击荷载的动应力数据,采用Abaqus软件进行数值模拟,对比实测数据验证道路模型准确性。进行室外道路现场观测,采集车辆动荷载数据,建立车辆动荷载模型,对比实测数据验证模型准确性。在此基础上参照现有路基工作区定义,模拟计算出不同轴重车辆在不同速度下车辆动荷载的路基工作区深度以及改变路面结构层厚度和路基填料参数对路基工作区深度的影响,得出在典型路面结构下:考虑车辆动荷载的情况,高速公路路基工作区深度应在1.14m以上,一级公路为1.23m以上,二级公路为1.29m以上,三级公路为1.42m以上,重载交通情况下路基工作区深度相应加大30~40cm。
Based on the actual calculation and analysis of the dynamic load changing rule during the driving process of the vehicle, this paper proposes a method to calculate the depth of the working zone of the semi-rigid pavement based on the dynamic load of the vehicle based on the existing depth calculation method of the subgrade working area. method. The dynamic stress data of impact load were collected by indoor test. The numerical simulation was carried out by Abaqus software. The measured data were compared with the accuracy of the road model. Conduct outdoor road observation, collect vehicle dynamic load data, establish vehicle dynamic load model, and compare the measured data to verify the model accuracy. Based on the definition of the existing subgrade working area, the depth of subgrade working area with different axle loads under different vehicle speeds and the influence of pavement structural layer thickness and subgrade filling parameters on the working depth of subgrade are simulated and calculated. Under the typical pavement structure, considering the dynamic load of vehicles, the working depth of expressway subgrade should be above 1.14m, the first grade highway is above 1.23m, the second grade highway is above 1.29m, the third grade highway is above 1.42m Under heavy traffic conditions, the working depth of roadbed should be increased by 30 ~ 40cm accordingly.