Investigation on Carbonated Lime-Ash Solidified Frozen Soil and Damage Constitutive Model
In engineering projects of cold regions,the salt-freezing coupling effect often exacerbates the strength degradation of saline soil.We aim to investigate the variations in compressive performance of lime-and-flyash-solidi-fied carbonate soil under freezing conditions.With curing agent dosage,temperature,and loading rate as influen-cing parameters,we conducted unconfined compression tests on lime-and-flyash-solidified carbonate saline soil and subsequently proposed a damage constitutive model considering temperature and loading rate.Results indicate that lime and fly ash significantly enhance the compressive strength of carbonate soil,altering its stress-strain curve from weak strain softening to distinct strain softening.Optimal curing occurs with the addition of 3％lime and 12％fly ash.Temperature and loading rate markedly affect the compressive strength and elastic modulus of the solidified car-bonate soil,with their relationship being expressed as a nonlinear function.Temperature exerts far more larger influ-ence on compressive strength than curing agent dosage and loading rate.The established damage model effectively captures the stress-strain relationship and the variation trend of soil damage variables.
frozen saline soillime-flyash improvmentunconfined compressive strengthloading ratedamage constitutive model
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