Water quality, particularly pH, is one of the most important factors that may significantly influence soil physical and mechanical properties leading to damage of structures. This study aimed to investigate the effect of pore water pH on engineering properties of a natural clay soil. The soil was exposed to solutions with different pH values (4, 5, 6, 6.5, 9, 10, and 11) as buffered by acetate and carbonate-bicarbonate. Atterberg consistency limits, unconfined compressive strength, and shear strength parameters of the soil were measured after 90 days of exposure to the solutions. The results indicated that the unconfined compressive strength, shear strength parameters, and liquid limit of the soil increased considerably when the pore fluid had a high pH or a low pH. Thus, the results obviously showed that engineering properties of the soil greatly depend on the pH of pore water.

中文翻译：

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孔隙水pH值对黏土力学性能的影响

水质，特别是pH值，是最重要的因素之一，可能会严重影响土壤的物理和机械性能，从而导致结构损坏。这项研究旨在研究孔隙水pH值对天然粘土工程特性的影响。将土壤暴露于具有不同pH值（4、5、6、6.5、9、10和11）的溶液中，该溶液受乙酸盐和碳酸盐-碳酸氢盐缓冲。在暴露于溶液中90天后，测量土壤的阿特伯格稠度极限，无侧限抗压强度和抗剪强度参数。结果表明，当孔隙液的pH值较高或较低时，土壤的无侧限抗压强度，抗剪强度参数和液限明显增加。从而，