Investigation And Analysis On Subgrade Soil Frost Heaving Damage Of Jilin Province

The area of seasonal frozen region is513.7×104km2, accounts for about53.5%the land area. The influence of seasonal freezing climate on the quality of highwayprojects is very remarkable. With the freezing and thawing of water in soil, thetransverse cracking, longitudinal cracking and heaving uplift appear on asphaltpavement frequently during frost period, subsidence deformation and frost boilphenomena often appear during the spring melts period, which can reduce pavementquality and affect traffic safety and increase maintenance costs.In this study, the influences of frozen area, highway natural regionalization, thestandard deep-freeze, soil, topography and so on were considered, and thesystematic investigation on subgrade frost damage of Jilin province was carried out.The research is developed by analyzing the type and degree of frost damage,investigating field drilling, laboratory test and observing physical works. Theprinciple of frost heaving is studied. The influence of soil conditions, compactness,moisture and temperature on the structure and position of ice layer in frost heavingperiod are summarized. The influencing factors and laws between frost heaving andfrozen depth are explored. Moreover, the measures and points for preventing andreducing the frost heaving damage are put forward. Based on the existing index ofevaluating frost heaving character, the new index is put forward.Based on the achievements, the paper upgraded the “subgrade soil frost heavetester”, revised test method and put forward test conditions of subgrade soil in heavyfrost region, which made frost heave test highly efficient and scientific. Therefore, ithas broad market prospects and a good application value.