强夯法加固河堤地基的效果分析——以日东高速济宁西连接线为例

Effect Analysis on Reinforcement of Dike Foundation in Jining City by Using Dynamic Compaction Method——Setting Connection Line in West of Jining City of Ridong High-speed as an Example

以日东高速济宁西连接线K11段强夯为例,对强夯前后的河堤地基进行了对比勘察研究。结果表明,强夯后,地基土的密实度,重度及干重度增加,孔隙比、粘聚力、内磨擦角、压缩模量明显比强夯前减小,同一深度土层标贯击数有所增加,土的锥尖阻力和侧摩阻力也有不同程度的提高,对比不同深度孔隙比变化的幅度和强夯前后锥尖阻力和侧摩阻力变化曲线,得出了强夯的有效加固深度。

Setting segment consolidation of K11 section in Ridong high - speed connection line in west of Jining city as an example, the embankment foundation before and after the compaction has been surveyed and studied comparatively. It is showed that after dynamic compaction, soil compactness, severe and dry density have been increased, while void ratio, cohesion, friction angle and compression modulus have been decreased obviously. At the same soil depth, SPT blow count has been increased, soil cone tip resistance and side friction have been increased in certain level. Comparing amplitude variation at different depth, cone tip resistance and side friction drag resistance change curve after strong compaction, effective reinforcement depth of dynamic consolidation has been obtained.