Weak water stability of soil is one of the prime causes of soil erosion and slope damage. To understand the improvement on the water stability of sand by a soluble organic polymer (polyurethane, PU), we have conducted a series of water-stability and turbidity tests to evaluate the effects of different polymer content, densities, and immersion times. The mechanism of the improvements is investigated based on scanning electron and digital microscopes. Our results reveal that the polymer can effectively improve the water stability of sand, where the water-stability coefficient enhanced from zero to 100. The turbidity of the water after oscillation was determined, and its value reduced from 84.5 to 10 and kept stable, which further proved the PU improvement on the water stability of sand. The results can be considered as the reference for construction and management of riverbanks and drainage ditches.

中文翻译：

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水溶性有机聚合物与砂混合的水稳定性的改善

土壤的弱水稳定性是土壤侵蚀和边坡破坏的主要原因之一。为了了解可溶有机聚合物（聚氨酯，PU）对砂子水稳定性的改善，我们进行了一系列水稳定性和浊度测试，以评估不同聚合物含量，密度和浸泡时间的影响。基于扫描电子显微镜和数字显微镜研究了改进的机理。我们的结果表明，该聚合物可以有效提高砂子的水稳定性，其水稳定性系数从零提高到100。确定了振荡后水的浊度，其值从84.5降低到10并保持稳定，进一步证明了聚氨酯对砂子水稳定性的改善。