Key Laboratory of Coal Resources and Mineral Resources, Jiangsu Design Institute of Geology for Mineral Resources (Testing Center of China National Administration of Coal Geology), China National Administration of Coal Geology, Xuzhou 221116, China; State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya (UPC), 08034, Spain.
Key Laboratory of Coal Resources and Mineral Resources, Jiangsu Design Institute of Geology for Mineral Resources (Testing Center of China National Administration of Coal Geology), China National Administration of Coal Geology, Xuzhou 221116, China.
J Hazard Mater. 2022 Mar 5;425:127762. doi: 10.1016/j.jhazmat.2021.127762. Epub 2021 Nov 21.
Longwall caving mining (LCM) can lead to many environmental problems that have drawn worldwide attention. A previous survey found that most scholars tend to analyze the two issues separately, that is, coal mining-induced subsidence and heavy metal pollution sources in the soil of the mining regions. Based on field monitoring as well as the collection and analysis of soil samples, a previous study estimated ground settlement and analyzed the surface subsidence law and spatial distribution characteristics of heavy metals in soils. Moreover, a geographic information system was combined with multivariate statistical analysis methods to analyze the heavy metal pollution sources in soils. At the same time, the mechanism of heavy metal accumulation in the subsidence area was analyzed. The study found that the most active subsidence of settlement was 137.5 m behind the workface and moved forward with the workface. LCM has already caused significant disturbance to the soils in the Hengyuan Mine. Moreover, the distribution pattern of eight heavy metals was consistent with the surface subsidence law. The sources of heavy metal pollution in the soils were also identified; namely, coal mining-induced subsidence (64.1%) and mixed transportation and wind-mediated spread (35.9%), offering a reinterpretation of the LCM's footprint.
长壁垮落采矿（LCM）可能导致许多环境问题，引起了全球关注。先前的调查发现，大多数学者倾向于分别分析两个问题，即采煤引起的沉降和矿区土壤中的重金属污染源。基于现场监测以及土壤样本的收集和分析，先前的研究估计了地面沉降，并分析了土壤中重金属的地表沉降规律和空间分布特征。此外，还结合地理信息系统和多元统计分析方法来分析土壤中的重金属污染源。同时，还分析了沉降区重金属积累的机理。研究发现，最活跃的沉降发生在工作面后的 137.5 米处，并随工作面向前移动。LCM 已经对横源矿的土壤造成了显著的干扰。此外，八种重金属的分布模式与地表沉降规律一致。还确定了土壤中重金属污染的来源，即采煤引起的沉降（64.1%）和混合运输及风媒传播（35.9%），这为 LCM 的影响提供了新的解释。
