Through practice of filling the roadbed construction of section II on Cen Wu highway in Guangxi Province, this paper explains the construction technology and method of filling roadbed with sand high liquid clay.

On the quality control of the expansive soil improved by lime subgrade filling;

The influences of cycles of freezing in winter and thawing in spring andsubgrade filling on 3~# landslide are analyzed with numerical method.

In order to ensure filling quality of the subgrade,enhance integrity stability of the subgrade,it accordes to detailed investment and combines with earth work test,provides scheme of adopting strong decomposed rock to get subgrade filling,and gets filling technology test,gets complete success,accumulates subgrade construction experiences of the mountain area expressway.

Mechanized construction in roadbed filling;

With the help of some practice on quality inspection of pile foundation,roadbed filling,tunnel,retaining wall and so on in railway construction,a series of problems including many representative cases,the existent difficulties,the inspection technique are discussed,which gives the reference and communion.

1 large-scale dissolved cavity of Longlingong Tunnel,the combination of roadbed filling and tunnel structure is selected as the treatment scheme through the comparative analyses and optimum design,and this has important reference for the treatment of.

The district hydrogeology conditions along the routes of a road project are different,therefore in order to use local materials,many kinds of materials were adopted for roadbed filling.