行车荷载和填筑高度对粉性土路堤变形的影响  

Effect of Traffic Load and Fill Height on the Silt Embankment's Deformation

作　　者：商庆森[1] 朱海波[2] 杜红庆[1] 

机构地区：[1]山东大学,山东济南250061 [2]东南大学,江苏南京210096

出　　处：《公路交通科技》2004年第1期22-25,共4页Journal of Highway and Transportation Research and Development

基　　金：山东省自然科学基金项目资助(Q99F13)

摘　　要：不同行车荷载、不同填筑高度下的变形应力有限元分析表明: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>8m,随路堤高度增加,路堤内的应力、应变急剧增大,路基的变形远超过路基的容许弯沉。提高压实标准,路堤内应力几乎没变化,但对减少竖向变形的作用随填筑高度增加而逐渐增大。葡氏重型不同压实度标准的压缩、回弹模量表明,提高粉土路基的压实度,特别是90%、93%区的压实度能有效地降低路基的孔隙比及变形,改善路面结构的疲劳拉应力状况。The authors use the FEAM (finite element analysis method) to calculate the deformation and stress of the silt embankment, under different traffic load, compactness or fill height.The results indicate that large deformation is caused by over loaded truck, 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.Compaction test indicates that to increase the degree of compactness in the embankment, especially in the areas of 90% or 93% degree of compactness can reduce embankment's deformation and ameliorate the state of fatigue stress of pavement structure.

关 键 词：粉性土 路堤 有限元 应力 变形 

分 类 号：U416.12[交通运输工程—道路与铁道工程]