Study On The Mechanical Parameters Of Sulfate Salty Soil And The Calculation Of Bearing Capacity

This paper regards sulphate salty soil that is formed from the Xi'an loess filled with water and sodium sulphate as the research object, makes further systemic study on physical and mechanical property through indoor test, and makes the analysis of the compaction property and the hydrology characters when the salt content varies with external condition ; At room temperature, summarizes regression equations through quadratic orthogonal regression plan and shear test, then makes the analysis of shearing strength parameter c,φfrom the initial dry density,moisture content salt content and two factors' interaction; finds main influencing factor and changing regularity, finally according to the salty soil's characters and shearing strength parameter, supposes that saline soil's stratum is stratified subgrade, pictures strain figures chart, uses the rigid and plastic body's limiting law for analyzing the calculation of bearing capacity ,then gives a example for checking computations.The results showed that:1. Optimum moisture content of the sulphate salty soil is enhanced whereas maximum dry density falls following the salt content increasing.2. The plastic property of sulphate salty soil is enhanced with the salt content gradually adding.3. The initial dry density in the three factors has a heavily effect on the parameters of shear strength, salt content has side effect.4. The conventional calculation of bearing capacity is conservative through studying on the ground bearing capacity of the sulphate salty soil.