干线公路陡坡路段沥青路面结构受力分析

Mechanical Response of Asphalt Pavement in the Steep Slope Road of Trunk Highway

西南山区干线公路受地形和经济条件限制,急坡陡弯路段较多,沥青路面结构层普遍偏薄,容易产生早期病害。基于弹性层状体系理论,建立陡坡路段沥青路面的三维有限元模型,分析研究了不同工况(平坡路段和陡坡路段)和不同路面结构(常规路面结构和高模量路面结构)条件下沥青路面在车辆荷载作用下的受力特性。结果表明:随着坡度的增加,沥青面层底部纵向剪应变显著增加,相比平坡路段,当坡度增至6%时,沥青面层底部纵向剪应变增加了16.83倍。建议提高沥青混合料模量以改善陡坡路段沥青路面结构的受力状态,延长沥青路面使用寿命。

Due to the limitation of terrain and economic conditions,the trunk highway in the southwestern region has many steep slope road,and the asphalt pavement structure layer is generally thin,which is easy to cause various early diseases.In order to analyze the mechanical response of asphalt pavement in the steep slope road of trunk highway,a three-dimensional finite element model of asphalt pavement is established based on the elastic layer system theory.The mechanical response of common asphalt concrete pavement on flat slope and steep slope road,common asphalt concrete pavement on steep slope road and high modulus asphalt pavement under vehicle load were analyzed and studied.The results showed that longitudinal shear strain at bottom of surface increases significantly with the increase of slope,which increased by 16.82 times compared with the flat slope road when the slope increased to 6%.Meanwhile,the high modulus asphalt pavement can significantly improve the performance and prolong the service life of asphalt pavement on steep slope road.