交通荷载下非对称加筋路堤动力特性研究

Study on Dynamic Behavior of Asymmetric Reinforced Embankment under Traffic Load

黄土地区公路路堤尤其是非对称路堤,经常出现过大沉降、不均匀沉降和边坡失稳等病害,严重影响了公路长期运营性能.为研究交通荷载下非对称路堤动力特性,考虑山西省运煤车辆行车荷载的影响,将交通荷载视为半正弦波循环荷载,通过数值模拟研究了黄土地区非对称路堤未加筋、加格栅和加EPS板3种工况的动力特性,着重对交通荷载振幅、频率和行车间隔的影响进行了参数分析.结果表明:交通荷载振幅和频率对路堤变形影响较大,而行车间隔的影响较小;采用格栅加筋的黄土非对称路堤变形控制效果好于加EPS板.

In the loess region,the excessive settlement and differential settlement,slope instability,occur frequently on the embankment,especially on the asymmetric embankment.In this paper,the dynamic behaviors of the asymmetric unreinforced,reinforced with geogrid or EPS embankment were studied through numerical simulation considering the effects of traffic load of coal trucks and regarding the traffic load as semi-sine wave.Parametrical analysis was also conducted considering the amplitude,frequency of traffic load and the interval between trucks.The results showed that the amplitude and frequency of traffic load had great effects on the deformation of embankment,while the interval between trucks was of less effect.The reinforcement effect of geogrid was always better than EPS.