Direct shear test of fly ash-stabilized soft soil with considering salinity effect
Using fly ash as curing agent,the multiple groups of fly ash-stabilized soft soil samples were prepared with pore water salinity levels of respective 0％,2％,4％and 6％and curing times of respective 3 hours,7 days and 28 days.Through laboratory direct shear tests,the influence of salinity on the strength characteristics of fly ash-stabilized soft soil was investigated.The test results show that at the vertical consolidation pressure of 50 kPa,the relationship curve between shear stress and shear displacement of the fly ash-stabilized soft soil exhibits softening behavior,while at the vertical consolidation pressure of 200 kPa,the curve shows hardening behavior.The high salinity samples exhibit lower peak shear stress and residual strength,which indicates that high salinity has adverse effect on the strength characteristics of the fly ash-stabilized soft soil.As the salinity is increased,the shear strength,cohesion and internal friction angle of soft soil samples at all curing times show approximately linear decreasing trend,which is mainly due to the inhibition of hydration reaction of the active components in the fly ash caused by the increased salinity.
fly ashsoft soilcuring agentsalinitycuring timelaboratory direct shear test
万方数据
维普
