粉性土路堤变形的有限元分析

粉性土路堤在不同行车荷载、不同压实度、不同填筑高度下的变形和应力有限元计算结果表明:超限车辆引起粉性土路堤的过大变形是导致半刚性沥青路面结构疲劳开裂的重要因素.路堤填筑高度大于8m后,路堤内的应力应变急剧加大,大大超过路基顶面的容许弯沉.提高粉土路基的压实度,特别是提高90 % ,93%区的压实度能有效地降低路基的变形,改善路面结构的疲劳拉应力状况

Finite element analysis of the silt embankment deformation

We use the FEAM (finite element analysis method) to calculate the deformation and stress of the silt embankment, which is under varies carloads, varies degrees of compaction or varies fill heights. The results indicate that too large deformation, which is caused by superimposed-load, is an important factor to produce fatigue crack of pavement structure. When embankment height exceeds eight meters, stress and strain in the embankment rise quickly. They will be bigger than allowable deflection on top of the embankment. To increase degree of compaction in the embankment, especially areas of 90% or 93% degree of compaction, can reduce embankment deformation, can ameliorate the state of fatigue stress of pavement structure.