强夯和强夯置换在高速公路软土地基加固中的应用

以张承高速公路崇礼至张承界软土地基加固为例,介绍了采用强夯和强夯置换加固软土地基的方案选择、加固机理、垫层的作用,以及设计方案优化、施工工艺控制方法,指出采取强夯和强夯置换加固软土地基能使夯击后的地基承载力明显提高,减少路基的沉降。实例证明,其加固方法满足技术、经济、质量、工期、环保等方面的要求,并且优于其他软土地基加固方法。

Application of Dynamic Compaction and Dynamic Compaction Displacement to Improve Soft Foundation in Expressway

Taking the project of Chongli to Junction of Zhangjiakou and Chengde in Zhangjiakou-Chengde Expressway as an example,this paper introduces the scheme selection,reinforcing mecha-nism,the role of cushion layer and design optimization,construction process control methods of using dynamic compaction and dynamic compaction displacement to improve soft foundation.It is indicates that the dynamic compaction and dynamic compaction displacement can significantly improve the bear-ing capacity of soft foundation after tamping and reduce the subgrade settlement.The example proves that the strengthening method is better than the other methods,which can meet the requirements of technology,economy,quality,construction period,and environmental protection and so on.