Techniques of Preventing Subgrade from Salinization for Qarham to Golmud Expressway

Abstract:

Qarham to Golmud expressway is the first high-grade road in Qarham salt lake, which is regarded as the most enormous inland salt lake in China, moreover, it is the first expressway built on the inland salt lake in China. There is high and excessive saline soil distributed over this area whose thickness is no less than 20m, but the average subgrade height of the expressway is only 2m. A great many of measures are taken for the construction of the subgrade to prevent salt migrating from foundation to roadbed and pavement, which will cause disasters of secondary salinization in roadbed and pavement. By paving testing road at the site and detecting the efficiency of the measures in preventing salt, the paper put forward the technique of preventing subgrade from salinization for Qarham to Golmud expressway. The results of testing and detecting demonstrate that the height of salt migration is only 45cm in subgrade under the condition of brine supply, which is less than the height of subgrade. So it is efficient to keep the roadbed and pavement from the erosion of salt; The settlement of road surface was about 0~2mm among 3 months since the highways had been opened to traffic for two years, and uneven settlement and other diseases caused by the secondary salinization were not appeared, which showed that the measures of salinization prevention (salt resistance) were taken well to achieve the design purposes.

• Periodical: Advanced Materials Research (Volumes 960-961)
• Pages: 97-102
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.960-961.97
• Online since: June 2014
• Authors: Jun Yong Liu*, Liu Jun Zhang
• Keywords: Qarham Salt Lake, Qarham to Golmud Expressway, Saline Soil, Subgrade, Technique of Salinization Prevention

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