Abstract

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Title:: Research on Effect Factors of Strength of Lime-treated Loessial Sulfate Salty Soil

Author(s):: WEN Tao; MI Hai-zhen; MA Lian-sheng; WANG Yue-li; School of Civil Engineering, Lanzhou University of Technology

Keywords:: loessial sulfate salty soil; strength; unconfined compression test; static triaxial test

Abstract:: In order to fully investigate the effect factors and influence rules of strength of limetreated loessial sulfate salty soil, a lot of samples of limetreated loessial sulfate salty soil under different conditions were researched by unconfined compression test and static triaxial test. The results indicate that limetreated loessial sulfate salty soil has high early strength. However, when salinity is rather high (not less than 1.5%), with the increase of curing period, the strength of limetreated loessial sulfate salty soil doesnt increase consistently, but first increases and then decreases. The strength of limetreated loessial sulfate salty soil is reduced significantly when the lime content is too much or too little, and the ratio of lime to soil 2∶8 is closest to optimum mixture ratio. The strength of limetreated loessial sulfate salty soil increases with the rise of plasticity index and first increases and then decreases with the rise of salt content, and the salt content corresponding to peak strength is about 0.5%. The higher the salt content and plasticity index, the closer the strength in water to the strength in air. The experimental results have reference value for engineering application of limetreated loessial sulfate salty soil.