Collapsible Loess Areas Of Highway Subgrade Sinkhole Governance Research

The loess pitfall in the collapsibility loess roadbed is common highway hazard in the area of collapsibility loess. It also brings heavy danger to communication and transportation and belongs to the subject waiting to be solved urgently in the highwayengineering too. In this paper, based on the subject of the technology of exploring loesspitfall in collapsibility loess roadbed, the author summed of the history of the loess pitfall and researched on the classification and form mechanism of loess pitfall, at last ,analysis the stability of the pitfall by using FEM program of MARC.Through researching on the classification and form mechanism of loess pitfall, some methods treating the pitfall in collapsibility loess roadbed such as grouting, Geocell, explosion, dynamic consolidation and SDDC etc. are put forward and the suitable terms of various kinds of methods and their own pluses and minuses have been discussed.To the loess pitfall ,the most important thing is prevention beside treatment. As building the roadbed on the collapsibility loess zone, we must kill the collapsibility of the loess, then prevent the pitfall be formed. On the other hand ,we must often maintain the roadbed to prevent the forming of pitfalls.On the general, to treating the pitfall must be systematic and collected to the different zone of different conditions.