When exposed to chemicals, the micro-structural evolution of the loess and the impacts on the macro-mechanical properties are considered crucial for contaminated land reclamation. In this study, the micro-structural characteristics of the loess specimens that are exposed to acetic acid or sodium sulfate, are studied using scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy analyses. Further, their macro-mechanical properties are determined by direct shear tests. The corrosion of the cement between particles under acetic acid environments and the salt-induced swelling under saline conditions play an important role in the micro-structural deterioration. The cohesion and friction angle for the wetted loess are about 16 kPa and 19° respectively, while for the acetic acid-contamianted loess, they reduce to 10 kPa and 15° respectively. They, for the sodium sulfate-contaminated loess, reduce further to below 10 kPa and 13° respectively. The macro-mechanical properties show good correspondence with the micro-structural deterioration.

当暴露于化学品时，黄土的微观结构演变和对宏观力学性能的影响被认为是污染土地复垦的关键。在这项研究中，使用扫描电子显微镜、X 射线衍射和能量色散光谱分析研究了暴露于乙酸或硫酸钠的黄土样品的微观结构特征。此外，它们的宏观机械性能由直接剪切试验确定。醋酸环境下水泥颗粒间的腐蚀和盐水条件下的盐致溶胀对微结构劣化起着重要作用。湿润黄土的内聚力和摩擦角分别约为 16 kPa 和 19°，而醋酸污染黄土的内聚力和摩擦角分别为 它们分别降低到 10 kPa 和 15°。对于受硫酸钠污染的黄土，它们分别进一步降低到 10 kPa 和 13° 以下。宏观力学性能与微观结构劣化表现出良好的对应关系。