Abstract:The problem of water seepage through structural joints caused by the aging of water-stop materials in ship locks has persisted for a long time.The last-level ship lock of a canal situated in a tidal river section is particularly prone to the aging of structural joint water-stop due to the combined effects of saltwater intrusion from the open sea,frequent filling and draining of the lock chamber,and prolonged exposure to intense ultraviolet light.To avoid the above problems,high-performance rubber is selected as the water-stop material.However,the constitutive model parameters used to describe the mechanical behavior evolution of the material under complex service conditions have not yet been determined.Therefore,this article conducts accelerated degradation tests and uniaxial tensile tests on water-stop materials under conditions ultraviolet aging and high-frequency dry-wet alternation of saline water environment,and studied the evolution laws of stress-strain relationship curves of four types of rubber waterstops,namely ordinary,OMEGA,GB and ultra-high performance waterstops,over time in this environment.The results indicate that with the increase of time,the stress-strain relationship curves of the four types of waterproofing materials show a decreasing trend.By regression fitting the scatter values of mechanical constitutive parameters of different rubber materials,the time-varying relationship between stress and elongation of waterproofing materials under different aging times is obtained,which improved the Mooney-Rivlin 2 parameter model.Finally,combined with the experimental acceleration ratio,the mechanical constitutive parameters of four types of water-stop materials under natural aging conditions are converted from the experimental environment,providing reference for the design and maintenance of ship locks in similar environments.
