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Instability of erodible slopes due to extreme climate events and of permafrost slopes due degradation and thawing is a significant engineering problem for northern transportation infrastructure. Engineers continually look for mitigation alternatives to stabilize erodible slopes and reduce thaw instability and related hazards in permafrost areas. Traditional stabilization techniques tend to be costly as they require specialized skills and equipment to ensure adequate performance. Additionally, the effectiveness of traditional slope stabilization methods becomes limited in cold climatic conditions. Recently, geofibers and synthetic fluid have been used to improve very loose sandy soils. The projects propose is to conduct a large-scale field investigation to study the feasibility of stabilizing erodible and thawing permafrost slopes with geofibers and synthetic fluid. The proposed research will greatly help minimize the problems and risks posed by thawing permafrost slopes instability in cold regions. The outcome of this research will be useful in ensuring a reliable, safe and economic design. The followings are expected to be accomplished: (1) large-scale testing of the proposed technology on an insitu slope, 2) development of design guidelines for producing plans and specifications for geofiber/synthetic fluid reinforced slopes, 3) a guidance manual for construction installation and maintenance of the constructed slope

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