Study on the kind of filling and disposing the back of abutment;

This article,considering the construction technique and quality control of the backfilling of the back of abutment in the seventh phase of Qinglai Expressway,gives some suggestions,which will provide valuable references for later backfilling construction.

The paper introduced the construction technology of liquid flyash pouring retailing backwall in order to assure refill quality of retailing backwall,protect retailing backwall depression or jumping.

For assuring the fill quality of structure retailing backwall for Taichang Expressway,the paper proposed relative control measures for reference.

The paper mainly introduced the importance of the grouting strengthening for expressway bridge & culvert retailing backwall.

There are some emphases discussed which about picket abutment backfill in road construction in this paper,and on the basis of engineering practice of the backfilling behind abutments of Shen-Da freeway to summarize the measures of quality control.

It analyzes the reasons of traffic jumping in bridge end from base soil quality,platform filler s shrinking and rigidity changes.

Reasonable setting of approach slab and back filling behind abutment;

The application of cement-fly ash mixture in back filling behind abutment;