A Study On Properties Of Saline-alkali Soil In North-east Songnen Plain

Saline-alkali soil is distributed in various regions of the world. China's distribution of saline-alkali soil occupy a certain area, Because saline land is a special foundation, it has a significant influence to the engineering properties. In China, a large number of saline-alkali soil is distributed in the Songnen Plain, it not only contain a small amount of sulfate and chloride, but also contain more components of Na₂CO₃ and NaHCO₃.The study is based on the samples of the Songnen Plain soil, first understand its chemical composition through the soluble salt experiment, and then comparative analysis the particle compositiont that the salt saline soil is washed salt and isn't ,after that, study the impact of the trend on the salinity to the liquid and plastic limits and compaction. and then through the cut experiment test the shear strength c,φvalue of the soil in different densities and salinity and water. for the research to expansion characters of the soil , respectively, from the density and salinity to study the expansion when the soil meet the water. Finally, because this carbonated saline soil samples from the northeast region of the Songnen Plain , so it has close relations to the its environment , in order to understand the impact of the simulate temperature and humidity on saline soil carbonate expansion, study the expansion characteristics of soil in repeatedly freezing and thawing cycle experiment.Through a series of research results, we have come to the impact of carbonated saline soil factors and changes in the mechanism, which has provided an important reference to use the saline soil in the region.