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为更全面了解寒区隧道防水材料长期性能,以赛里木湖隧道为依托,选取EVA防水板分别在0次、25次、50次冻融循环条件下开展了室内拉伸、低温及顶破试验,研究了其作为寒区隧道防水材料的工作性能.结果表明:冻融循环对EVA防水材料的纵横向拉伸强度、纵横断裂延伸率、顶破强力和顶破延伸率有着较明显的影响,即随着冻融循环次数的增加,这些指标均降低,且有随着循环次数的增加降低幅度有增大的趋势,这说明冻融循环对材料性能的负面影响很大;冻融循环对EVA的低温抗裂性能基本没有影响.
In order to fully understand the long-term performance of tunnel waterproofing material in cold region, taking EVA Lake tunnel as the base, EVA waterproof board was selected to carry out indoor tensile test, low temperature test and bursting test under 0, 25 and 50 freeze-thaw cycles respectively The results show that the freeze-thaw cycle has a significant effect on the longitudinal and transverse tensile strength, longitudinal and transverse breaking elongation, bursting strength and bursting elongation of EVA waterproof material , That is, with the increase of the number of freeze-thaw cycles, these indicators are reduced, and there is a tendency that the decreasing extent increases with the increase of the number of cycles, which indicates that the negative impact of the freeze-thaw cycles on the material properties is great; EVA’s low temperature crack resistance basically no effect.