SALT CHARACTERISTICS AND ITS IMPACT ON ENGINEERING FOUNDATION SOIL IN LIANYUNGANG MARINA AREA

Soil-containing salt characteristics is an important reference indicators for environmental evolution, engineering foundation design and urban green space construction. By collecting 616 earthy samples in Lianyungang, the study is based on the test results and the soil layer division results. The research zone of depth 80m is systematically analyzed by the brine-containing characteristics of the soil layer. The results show that the 80m thick soil is mainly subject to 3 sea assays in the light soil layer. The salt is mainly NaCl, with the highest ratio of Cl^- reached 62.01%. NaCl content ratio reaches 94.25%. The containing salt is 0.020% to 7.149%. The new land layer is high salt, and mainly salted soil. As the depth increases, the amount of soil salt contains salt has a declining trend. The highest soil layer containing salt is in 2-1 layer clay. Update the content of the land of the world is high, and there are weak saline soils except for the 8-2 sand layer. Affected by the sea, the salt contained in the sea is higher than that of its overlap and underlap layers. The sea assault has infected infection, so that the amount of the land formation is increased. The soil layer of fine grain soil is generally greater than sand in the same layer. Earth layer ESR value is higher, both greater than local surface freshwater SAR. The ESR maximum 103 appears in the 3-1 soft soil layer, and it is 32 times the ESR value of the local surface fresh water ESR value. The statistical average γ_Mg/γ_Ca range is 0.80~2.67. The γ_Mg/γ_Ca value of soil is larger than the γ_Mg/γ_Ca value of fresh water in the study area, which indicating that the earth layer of the study area is affected by seawater invasion. The largest level of soil γ_Mg/γ_Ca appeared at 3-1 soft soil, which indicating that the layer of soil is controlled by the sea. The pH of each layer is greater than 7.7, and the pH of the light surface layer 2-1 and the 3-1 layer are both 8.3. The soil improvement needs to be applied to an acidic or calcium improvement agent. The corrosion resistance of each soil layer is mainly based on the Cl^-corrosiveness of the reinforcement in the concrete structure. The strong corrosive etching layer is mainly distributed at 25m to the soil layer, and the soil layer is 3-1 layer soft soil and 2-1 floors. While giving the corrosive boundary volume of the steel bib in the concrete structure in the soil, the engineering construction should pay attention to the basic anti-corrosion.