College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China.
College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'an University of Science and Technology, Xi'an 710054, China.
J Contam Hydrol. 2024 Sep;266:104413. doi: 10.1016/j.jconhyd.2024.104413. Epub 2024 Aug 8.
Soil degradation, characterized by the deterioration of soil physical and chemical properties, nutrient loss, and an increase in toxic substances, is a key ecological concern in mining activities. This study explores the use of waste black shale from mining development as an additive to loess to enhance soil properties for reclamation in mining areas. The research includes resistivity and organic carbon content tests on modified reclaimed loess with varying black shale and water contents. Additionally, the electrical properties of these modified soils are investigated across different AC frequencies. The results highlight the significance of soil plasticity and a 1.5% black shale content in influencing reclaimed loess's electrical properties. Moisture content and black shale influence changes in soil conductive paths and resistivity. The abundance of clay minerals in black shale plays a crucial role in altering soil electrical resistivity due to the adsorption of cations in water and the directional transport under an electric field. Considering soil's three-phase composition and diffuse bilayer structure, the study elucidates the mechanism behind changes in the electrical properties of improved reclaimed loess, accounting for water and black shale content. This research demonstrates the feasibility of using black shale as a soil additive and emphasizes the non-destructive assessment potential of electrical resistivity test (ERT) measurements for modified reclaimed soils.
土壤退化是采矿活动中的一个关键生态问题，其特征是土壤物理和化学性质恶化、养分流失以及有毒物质增加。本研究探讨了将采矿开发过程中产生的废黑色页岩用作添加剂来改良黄土，以提高矿区复垦土壤的特性。研究包括对不同黑页岩和含水量的改良再生黄土进行电阻率和有机碳含量测试。此外，还研究了这些改良土壤在不同交流频率下的电特性。研究结果表明，土壤塑性和 1.5%的黑页岩含量对影响再生黄土的电特性具有重要意义。含水量和黑页岩影响土壤导电路径和电阻率的变化。黑页岩中丰富的粘土矿物在改变土壤电阻率方面起着至关重要的作用，这是由于水合阳离子的吸附以及在电场下的定向传输。考虑到土壤的三相组成和弥散双层结构，本研究阐明了改进再生黄土电特性变化的机理，考虑了水和黑页岩的含量。该研究证明了将黑色页岩用作土壤添加剂的可行性，并强调了电导率测试（ERT）测量对改良再生土壤的非破坏性评估潜力。
