Study On The Intensity And Law Out Of Shape Of The Semi-Rigid Material Intensity At The Basic Level Of Salty Soil

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'characters and shearing strength parameter, supposes that saline soil'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) With the increase of the salt content, the best water content of mixing several kinds of semi-rigid materials which add sulphate will increase, but Work energetically density most reduce gradually, the range reduced is not big most;(2) In the lime content, content of fly ash, the density, freeze initially ,salt content, while melting these five factors of circulation number of times,the fly ash content and the density to have side to be limit compression strength of great impact soil, the lime content, freeze initially , salt content to be limit compression strength of relatively small impact soil.1) When other factors keep at the basic level, try on piece have side limit compression strength up to lime content, fly ash content, salt content and increase to be density crescent; 2) When the ones that only endure cold and melt circulating influence, the ones that froze and melted the number of times of circulation are crescent at the same time, the limit compression strength of side to reduce to try one gradually.(3) Through to mixing and adding drawing back experimental study temperature shrinkage and dry shrinkage of the stable soil material of sulphate,find the existence of the sodium sulfic acid helps to reduce the contracting in the temperature shrinks and dry t shrink of the crack of the semi-rigid material at the basic level.