Abstract This study aimed to examine the change in the mechanical properties of the silty sand reinforced with an aqueous solution of polyvinyl alcohol (PVA) subjected to freeze-thaw cycles. A series of unconsolidated undrained triaxial compression tests were conducted to determine the compressive strength, resilient modulus, cohesion, and internal friction angle. Experimental samples were prepared by adding aqueous solutions of different PVA concentrations (5%, 7.5%, and 10% of the weight of the water) into silty sand. The numbers of freeze-thaw cycle (0, 5, 10, 15, 20) were realized in a closed system. A comparison of reinforced and unreinforced samples of silty sand showed that the addition of an aqueous solution of PVA can significantly affect the mechanical properties of silty sand. It was experimentally proven that the positive impact on the mechanical properties of soil increases with increasing concentration of PVA in the solution and with increasing number of freeze-thaw cycle. When a 10% aqueous solution of PVA was added into the soil, the strength of the samples after 20 freeze-thaw cycles increased by 8.5% compared with the strength before freezing. The resilient modulus of unreinforced samples after 20 cycles decreased by 16.1%, while that of reinforced samples after 20 cycles increased by 30.2%. According to the results, the reinforcing additive has a significant effect on the cohesions of soil both before and after the freezing process.

中文翻译：

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聚乙烯醇水溶液加固粉砂的冻融循环性能

摘要 本研究旨在研究经冻融循环的聚乙烯醇（PVA）水溶液加固粉质砂的力学性能变化。进行了一系列松散不排水三轴压缩试验，以确定抗压强度、回弹模量、内聚力和内摩擦角。通过将不同 PVA 浓度（水重量的 5%、7.5% 和 10%）的水溶液添加到粉砂中制备实验样品。冻融循环次数（0、5、10、15、20）在封闭系统中实现。粉质砂加筋和未加筋样品的比较表明，加入PVA水溶液可以显着影响粉砂的力学性能。实验证明，随着溶液中 PVA 浓度的增加和冻融循环次数的增加，对土壤力学性质的积极影响也增加。当土壤中加入10%的PVA水溶液后，经过20次冻融循环后的样品强度比冷冻前增加了8.5%。20次循环后未增强样品的弹性模量下降16.1%，而20次循环后增强样品的弹性模量增加30.2%。结果表明，增强添加剂对冻结前后土壤的黏聚力都有显着影响。当土壤中加入10%的PVA水溶液后，经过20次冻融循环后的样品强度比冷冻前增加了8.5%。20次循环后未增强样品的弹性模量下降16.1%，而20次循环后增强样品的弹性模量增加30.2%。结果表明，增强添加剂对冻结前后土壤的黏聚力都有显着影响。当土壤中加入10%的PVA水溶液后，经过20次冻融循环后的样品强度比冷冻前增加了8.5%。20次循环后未增强样品的弹性模量下降16.1%，而20次循环后增强样品的弹性模量增加30.2%。结果表明，增强添加剂对冻结前后土壤的黏聚力都有显着影响。