重载作用下公路路基及基层动应力测试研究

针对超载超限车辆引起的高速公路路面结构破坏问题，通过现场实测，对新建高速公路在重型交通车辆以不同载重、不同车速、通过不同车道时路基路面的动态响应（动应变、动应力）规律进行了研究。研究表明：在竖向上随着深度的增加动应力呈衰减趋势；随着车速的增加，荷载频率向高频方向移动，同一测点动应力极值呈总体减小趋势，其减小幅度与车速紧密相关；而随着车辆载重的增加，动应力同样增大，但前后轮下差别较大，且较深处（如路基顶面）增大幅度要小于较浅处（如面层底面）；车辆通过超车道时相邻行车道横向内均有动应变发生但数值较小，衰减迅速。

Test on Dynamic stress of Roadbed and Pavement under Heavy Loads

Dynamic responses of roadbed and pavement in the condition of passing heavy vehicles with different loads,different velocities and on different lanes were analysed(including dynamic strain and stress).The study shows that dynamic stress decreases with the increase of pavement and bed depth.As vehicles speed up,the load will tend to include higher frequency components and dynamic stress peak values at the same measuring point generally will be on the trend of decreasing,with the decreasing gap related to vehicles' velocity.As vehicle's load raises,dynamic stress increases accordingly.However,the stress under the front wheel differs from that under the rear wheel,and the stress at deeper places(such as top of roadbed)is lower than that at shallower places(such as bottom of pavement).When vehicles pass through different lanes,there will appear some changes in dynamic stresses on adjacent lanes,but the changes are slight and diminish rapidly.