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为探索氯离子对红土坝料的破坏机理,设计了化学加速试验,比较了全渗液中铁、铝离子浓度及土样粘粒含量的变化,并分析了土样的微观结构图。试验结果表明,氯离子与筑坝红土中起胶结作用的铁、铝氧化物发生缓慢而长期的化学反应,生成的可溶盐随渗透水流失,降低了红土中胶结物的含量,破坏了红土的结构,进而在坝体内产生了细观渗透通道,降低了土石坝的可靠性和运行寿命。
In order to explore the destructive mechanism of chloride ion on laterite dam material, a chemical acceleration test was designed. The changes of iron and aluminum ion concentration in the whole exudate and the clay content were compared. The microstructure of the soil sample was also analyzed. The test results show that the chloride and aluminum in the laterite clay play a slow and long-term chemical reaction with the cementation of the laterite. The soluble salt formed will lose with the permeated water, reduce the content of the cements in the laterite and damage the laterite Structure, and then produce a meso-permeable channel in the dam, reducing the reliability and operational life of earth-rock dam.