To investigate the damage effect of salt-freezing cycle on hydraulic concrete,CT scanning was carried out to obtain two-dimensional and three-dimensional fissure models.Besides,the seepage simulation was used to investigate the deterioration of impermeability.The results show that the salt-freezing cycle leads to a significant increase in the rate of concrete mass loss and porosity,and the degree of discrete pore distribution increases;The three-dimensional fissure model shows the dynamic cracking process of the concrete,and the connecting fissures expand and connect rapidly during the salt-freezing cycle and ultimately penetrate through the specimen;The salt-freezing coupling effect induced by the cracking of the concrete has a serious impact on its permeability.The grouting and sealing measures must be taken in the project to enhance the safety and stability of hydraulic structures.
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