关键词: 公路, 地基, 沉降, 有限差分

Abstract: Using the computaion methods of finite difference, the sedimentation law of highway foundation in the flooding area of Yellow River is analyzed in different degree of compaction and depths of compaction, the compaction standard and technical measures are put forth. It is proved that it is important to reduce the settlement after the completion of roadbed, when the compaction is more than 90% for the situation with the roadbed height less than 6m. When the roadbed is heigher than 6m, the compaction degree raising has little effect on reducing the deformation of roadbed, of, especially for the compaction ranging in 90%～93%. It exhibits the same regulation in enhancing the compaction depth as that in raising the degree of compaction, which has evident effects on reducing the foundation sedimentation . Therefore, compaction standard of highway foundation should be put forth according to roadbed height. When the roadbed height is ≤2m, the degree of compaction should be ≥93% within the scope of 30cm of foundation surface layer. When the roadbed height is in the range of 2～6m, the compaction degree should be higher than 90% within the scope of 30cm of foundation surface layer. When the roadbed height is more than 6m, the degree of compaction should be ≥85% within the scope of 30cm of foundation surface layer. It is pointed out that dynamic compaction and pound grinding is the most economic and valid engineering technical measures in the flooding area of Yellow River.

Key words: highway, subgrade, deformation, finite difference