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采用足尺沥青混凝土路面加速加载试验设备,检测了移动车辆荷载下路面结构的动力响应,分析了面层底部的动应变和土基顶竖向压应力,研究了车辆轴重、行驶速度和轮胎胎压对路面结构动力响应的影响,分别建立了动力响应与轴重、车速的回归模型,在不同轴重、车速和胎压下对4种路面结构进行了试验。分析结果表明:在行车荷载作用下,面层底部应变响应呈拉压应变交变状态;在中等试验温度条件下,面层底部应变响应随轴重的增加而线性增加,土基顶竖向压应力呈单向应力状态,且随轴重增加而增大;车速显著影响面层底部应变响应,但对竖向压应力影响不大,仅影响应力的脉冲持续时间;随车速增加,应力脉冲时间缩短,面层底部应变响应减小;重载车辆在低速行车时对路面的破坏作用更严重,但胎压对面层底部应变和土基顶竖向压应力影响较小。
The full-scale asphalt concrete pavement accelerated loading test equipment was used to test the dynamic response of the pavement structure under moving vehicle loads. The dynamic strain at the bottom of the pavement and the vertical compressive stress at the top of the soil foundation were analyzed. The axle load, traveling speed and tire The influence of tire pressure on the dynamic response of pavement structure was established. The regression model of dynamic response, axle load and vehicle speed was established respectively. Four kinds of pavement structures were tested under different axle loads, vehicle speeds and tire pressures. The analysis results show that under the action of driving load, the strain response at the bottom of the surface layer is in the state of tension-compression strain alternation. Under medium test temperature, the strain at the bottom of the surface layer increases linearly with the increase of shaft load, Stress is uniaxial stress state, and increases with the increase of shaft weight; vehicle speed significantly affects the bottom of the surface strain response, but the vertical compressive stress has little effect, only affects the stress pulse duration; with increasing vehicle speed, stress pulse time The response of strain at the bottom of the surface layer decreases. The damage of heavy vehicles to the pavement is more serious when driving at low speed, but the effect of the tire pressure on the strain at the bottom and the vertical compressive stress at the top of the soil foundation is less.