Investigation on Carbonated Lime-Ash Solidified Frozen Soil and Damage Constitutive Model

LI Zhi-bin; LIU Li-jiao; HUANG Shuai; DING Lin; LIU Yan-jie

doi:10.11988/ckyyb.20230234

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (7) : 118-125. DOI: 10.11988/ckyyb.20230234

Rock-Soil Engineering

Investigation on Carbonated Lime-Ash Solidified Frozen Soil and Damage Constitutive Model

LI Zhi-bin¹, LIU Li-jiao², HUANG Shuai³, DING Lin², LIU Yan-jie²

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Abstract

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-solidified carbonate soil under freezing conditions. With curing agent dosage, temperature, and loading rate as influencing 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 carbonate soil, with their relationship being expressed as a nonlinear function. Temperature exerts far more larger influence 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.

Key words

frozen saline soil / lime-flyash improvment / unconfined compressive strength / loading rate / damage constitutive model

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LI Zhi-bin, LIU Li-jiao, HUANG Shuai, DING Lin, LIU Yan-jie. Investigation on Carbonated Lime-Ash Solidified Frozen Soil and Damage Constitutive Model[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(7): 118-125 https://doi.org/10.11988/ckyyb.20230234

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