Effects of erosion method and environment on mechanical properties of solidified soft soil
Soda residue(SR)-ground granulated blast furnace slag(GGBS)-carbide slag(CS)and cement were used as solidifiers of soft soil.Different erosion environments(Na2SO4,MgSO4 and seawater)and erosion modes(full immersion,semi-immersion and soil erosion)were set up.Unconfined compressive strength,X-ray diffraction and scanning electron microscope tests were carried out to study the effects of solidifier,erosion mode and environment on the erosion resistance of the solidified soft soil.Results showed that,under the same erosion mode and environment,the integrity and the strength of SR-GGBS-CS solidified soft soil were greater than those of cement-solidified soft soil.The samples in MgSO4 environment were seriously damaged and the strength values were the lowest.The integrity and the strength of cement-solidified soft soil in the semi-immersion mode were better than those in the full-immersion mode.Although the appearance of SR-GGBS-CS solidified soft soil was relatively complete in the semi-immersion mode,the strength in the semi-immersion mode was lower than that in the full-immersion mode.The strength of solidified soft soil was high in soil erosion mode.A large amount of thaumasite was generated in the soaking area of cement-solidified soft soil,contributing to its lowest strength in the full-immersion mode.As for SR-GGBS-CS solidified soft soil,more thaumasite generation and salt crystallization in the non-immersed zone resulted in the lowest strength in the semi-immersion mode.The semi-immersion became the most dangerous erosion mode for SR-GGBS-CS solidified soft soil.
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