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Application of Geosynthetics for Treatment of Subgrade Troubles in Permafrost Regions

PEI Jian zhong 1, DOU Ming jian 1, HU Chang shun 1, HE Zi wen 2, ZHANG Wei 2 (1. College of Highway, Chang'an University, Xi'an Shaanxi 710064, China; 2. Communication Research Institute of Tibet Autonomous Region, Lhasa Tibet 850000, China)  
Longitudinal cracks and the non-uniform settlements due to complicated causes are two main subgrade troubles in permafrost regions, which are difficult to treat. In this paper, three treatments are presented for the non-uniform settlements, according to their formation. Again, three treatments are presented for the longitudinal cracks, according to their types and classes. Analyzing the strength property, structural property, longevity and nature of easy to damage in construction, principles of choosing geosynthetics are presented. Combined with the knowledge in experiment project, construction technology is presented for permafrost regions. At the same time, the key construction technological problem of geosynthetics used in theses regions is also solved in this paper .
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