Abstract: Bumps at both ends of bridges are common hazards in highway construction.  This paper presents a case history of using soil dry cement mixing column and geogrid for the differential settlement at bridge ends mitigations. The results indicate that: a gradual stress redistribution process exists in the fill embankment operation. The dry cement mixing columns carry the majority of the overburden loads and a soilcolumn interaction effect exists in the load carrying. The soil dry cement mixing column can effectively reduce the total and differential settlement in the improved area. The role of grogrid is to improve foundation soil bearing capacity and the global stability through the load redistribution effect. The combination of the soil dry cement mixing column and geogrid can also effectively reduce the lateral movement of the bridge approaches.

Key words: Soil Dry Cement Mixing Columns, Geogrid, Soil Improvement, Field Studies