Gypsiferous soils are considered as problematic soils that cause damage to engineering infrastructures, particularly hydraulic structures. The exposition of gypsiferous soils to the steady flow leads to the dissolution of gypsum particles, significantly changing the soil engineering characteristics. In this paper, by employing physical, chemical, and mechanical experiments, the effect of raw gypsum with various percentages (0%, 3%, 6%, 9%, 12% and 15%) on the geotechnical parameters of a low plasticiy clay was investigated through leaching. Electrical conductivity test and ionic concentration analysis were used to assess the trend of gypsum dissolution. The results showed that leaching and increased gypsum content significantly degraded soil engineering characteristics, such as strength and compressibility. Acidic accelerator (diluted acetic acid) speeded up the chemical reaction rate and, at the same time, affected the geotechnical properties of the soil more than water. Mineralogical and microstructural studies (x-ray diffraction, scanning electron microscopy and energy-dispersive x-ray spectroscopy) were carried out to evaluate the interaction between gypsum and soil particles and verify laboratory test results. The x-ray diffraction patterns indicated the formation of new peaks such as calcium aluminate hydrated (CAH) and calcium silicate hydrated (CSH) and the altered structure of pure soil following the addition of raw gypsum. Scanning electron microscope images confirmed the presence of cementitious compounds and changes in the texture of gypsiferous soil in comparison with pure soil. Energy dispersive x-ray interpretation revealed changes in the chemical composition of soil blended with gypsum. The laboratory test results were corroborated by microstructural analyses.

石膏质土壤被认为是有问题的土壤，会损坏工程基础设施，特别是水利结构。石膏质土壤暴露于稳态流动导致石膏颗粒溶解，显着改变了土壤工程特性。本文通过物理、化学和力学实验，研究了不同比例（0%、3%、6%、9%、12%和15%）生石膏对低塑性粘土岩土工程参数的影响通过浸出进行了调查。使用电导率测试和离子浓度分析来评估石膏溶解的趋势。结果表明，浸出和石膏含量的增加显着降低了土壤工程特性，如强度和可压缩性。酸性促进剂（稀释乙酸）加快了化学反应速度，同时对土壤的岩土特性的影响大于水。进行了矿物学和微观结构研究（X 射线衍射、扫描电子显微镜和能量色散 X 射线光谱）以评估石膏与土壤颗粒之间的相互作用并验证实验室测试结果。X 射线衍射图表明新峰的形成，如水合铝酸钙 (CAH) 和水合硅酸钙 (CSH)，以及添加生石膏后纯土壤结构发生改变。与纯土壤相比，扫描电子显微镜图像证实了胶结化合物的存在以及石膏质土壤质地的变化。能量色散 X 射线解释揭示了与石膏混合的土壤化学成分的变化。微结构分析证实了实验室测试结果。