Abstract: Guizhou is located in mountainous area. With the rapid development of the highway construction in recent years, the number of high fill embankments in Guizhou has also increased significantly. Among these high fill embankments, many high fill embankments are constructed with special soils. The inherent engineering properties of these special soils, as well as the characteristics of large quantities, long construction periods, high filling heights, large, accumulated settlement during and after the construction and the need for the specialized analysis and the verification of stability have led to the complexity of high fill embankments with the special soils. Special high fill embankments often suffer from the local and total settlement, roadbed and pavement cracking, slope instability and collapses during the construction or operation period. These highway hazards might affect the construction safety and operation safety during the service period seriously. Combined with the typical geotechnical hazards of special soil high fill embankments in Guizhou Province, this paper proposes the prevention and mitigation measures from the aspects of design, construction, and maintenance points of view. The research results have an important reference significance for the prevention and mitigation of the special soil embankment hazards.

Key words: Special Soils, High Fill Embankment, Geo Hazard Prevention and Mitigation Measures