YANG Xiao-hua, ZHANG Sha-sha, LIU Wei, YU Ze-long. Research progress on engineering properties of coarse-grained saline soil[J]. Journal of Traffic and Transportation Engineering, 2020, 20(5): 22-40. doi: 10.19818/j.cnki.1671-1637.2020.05.002
Citation: YANG Xiao-hua, ZHANG Sha-sha, LIU Wei, YU Ze-long. Research progress on engineering properties of coarse-grained saline soil[J]. Journal of Traffic and Transportation Engineering, 2020, 20(5): 22-40. doi: 10.19818/j.cnki.1671-1637.2020.05.002

Research progress on engineering properties of coarse-grained saline soil

doi: 10.19818/j.cnki.1671-1637.2020.05.002
Funds:

National Natural Science Foundation of China 41807245

Natural Science Basic Research Program of Shaanxi Province 2019JM-147

Fundamental Research Funds for the Central Universities 300102219219

More Information
  • Author Bio:

    YANG Xiao-hua(1961-), male, professor, PhD, xiaohuay@126.com

  • Corresponding author: ZHANG Sha-sha(1982-), female, associate professor, PhD, zss_lx@126.com
  • Received Date: 2020-05-10
  • Publish Date: 2020-10-25
  • Based on the distribution of saline soil, the environmental protection feature and the importance of rational utilization of coarse-grained saline soil were expounded. In view of the single-factor salt expansion test results, combined with the multi-factor interaction salt expansion test, the effects of five factors such as soil, water, salt, temperature and force on the salt expansion of coarse-grained saline soil were analyzed. According to the comparison of on-site and laboratory collapse test results, the typical laws of collapse characteristics of coarse-grained saline soil were concluded. The results of the freeze-thaw cycle test of coarse-grained saline soil under different working conditions were also summarized, and the existing improvement methods of saline soil were refined. The research directions of engineering characteristics of coarse-grained saline soil were proposed. Research result shows that the physical and mechanical properties of coarse-grained saline soil are related to its particle composition and salt content. The granule gradation of coarse-grained saline soil is also different in different regions. Temperature, salt content, salt type, moisture content, initial density and overburden load are all key factors that affect the salt expansion of coarse-grained saline soil, while certain interactions occur among these factors. It is suggested that when coarse-grained saline soil is used as a subgrade filler, the influence of various factors on salt expansion should be carefully considered, and the factors that inhibit salt expansion should be effectively utilized. Both on-site and laboratory collapse tests are identified as effective methods to determine the saline soil collapse rate. However, the laboratory collapse tests need to be improved and standardized with consideration of the particle effect of coarse-grained saline soils. The freeze-thaw cycle test can approximately simulate the actual working conditions and directly reflect the laws of temperature, moisture and deformation of coarse-grained saline soil. In the design of test scheme, various environmental factors in the actual project should be comprehensively considered, and the combination of different factors has a significant impact on the freeze-thaw cycle test results. When improving the engineering properties of coarse-grained saline soil, the on-site materials should be fully utilized, and volcanic ash and fly ash have better improvement effects. Establishing a four-field fully coupled model of water-heat-salt-force is considered as a fundamental step to improve the salt expansion mechanism of coarse-grained saline soil.

     

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