This study evaluated the shear characteristics of compacted Ca-bentonite immersed in 0.1 mol/L of NaOH, KOH, and KOH–NaOH and 0.005 mol/L of Ca(OH)₂ at 40℃ over a maximum period of 1710 days. Triaxial compression tests were performed on the immersed specimens, and the mineral composition, mean layer charge, leachable cations, and microstructure were investigated. The dissolution of cristobalite was significant at high pH levels, whereas phillipsite was precipitated in the specimens immersed in the NaOH and NaOH–KOH solutions. The amount of leachable cations increased substantially, indicating that soluble secondary products (non-crystalline phase) were present in the specimens, as was proven by the observation of gel-like products comprised of Ca and Si on the microphotograph. An increase and decrease in the maximum deviator stress occurred as a result of the dissolution and precipitation. A structural parameter was proposed in this study by assuming the contribution of the secondary products to the cementation of the soil skeleton. This provided a series state transition of the compacted bentonite, where the maximum deviator stress increased with the cementation of the non-crystalline secondary phase. However, the progressing dissolution of the primary minerals decreased the dry density, thereby loosening the cemented structure and reducing the maximum deviator stress.

本研究评估了浸入 0.1 mol/L NaOH、KOH 和 KOH-NaOH 和 0.005 mol/L Ca(OH) _{2的压实 Ca-膨润土的剪切特性。}40℃，最长 1710 天。对浸入试样进行三轴压缩试验，研究矿物成分、平均层电荷、可浸出的阳离子和微观结构。方石英的溶解在高 pH 水平下显着，而在浸入 NaOH 和 NaOH-KOH 溶液的样品中沉淀出菲利普石。可浸出阳离子的量显着增加，表明样品中存在可溶性次生产物（非晶相），在显微照片上观察到由 Ca 和 Si 组成的凝胶状产物就证明了这一点。由于溶解和沉淀，最大偏应力增加和减少。在这项研究中，通过假设次生产物对土壤骨架胶结的贡献，提出了一个结构参数。这提供了压实膨润土的一系列状态转变，其中最大偏应力随着非晶次生相的胶结而增加。然而，原生矿物的进行溶解降低了干密度，从而松动了胶结结构并降低了最大偏应力。