超载超速作用下风积沙低路堤与地基动力特性研究

建立移动简谐荷载作用下三维路堤与换填地基动力响应模型，对超载、软土地基换填及行车速度等因素影响下的风积沙低路堤与地基动力响应展开研究。结果表明:①超载20%时，路基动力响应影响深度为6.9 m，远大于标准轴载下的1.9 m，超载对路基路面造成了较大的破坏；②对盐渍化软土地基采用砂砾换填处治后，改善了上部路基的变形特性；③不同车速工况下，动荷载的作用时间与幅值是动力响应的主要影响因素；高速行驶的车辆对路基动力响应的影响比低速要大得多。

Study on Dynamic Characteristics of Aeolian Sand Low Embankment and Foundation under Overload and Overspeed

The dynamic response model of three-dimensional embankment and replacement foundation under mobile harmonic load is established and the Aeolian sand low embankment and foundation dynamic response influenced by overload, soft soil foundation replacement and running speed, etc. is studied. The results show that:① when the overload is 20%, the influence depth of subgrade dynamic response is 6.9 m, which is far larger than 1.9 m under standard axle load. The overload caused great damages to the subgrade surface; ② after the saliferous soft soil foundation is treated by gravel replacement, the replacement foundation improved the deformation characteristics of upper subgrade; ③ under different vehicle speeds, the action time and amplitude of dynamic load is the main influence factor of dynamic response. The vehicles driving in high speed has a greater impact on the subgrade dynamic response than that of low speed.