Study on the Construction Technology of Hydraulic Fill with Sand for Freeway Subgrade

The application of construction technology of hydraulic fill with sand in high type road in China had made numerous social and economic benefits, but from some successful examples of using this technology, we can know that most of them have certain limitations and it has not developed completely. In this paper, the research of preparatory work, construction technology, environmental protection, quality control, and other aspects of this technology for freeway subgrade engineering have been introduced .What´s more, this paper lay out the application of this technology in modern society and tell the importance of hydraulic fill sand technology in the national economy. The results of this study for hydraulic fill sand technology play an increasingly important role in construction practice of some related works. The technology which is described in these paper have a great many of social and economic advantages in some areas, such as land and resources protection, reduction of investment, no effects in the rainy season etc.. Further more, the technology have a good prospect of application in freeway subgrade construction.