评估长壁采矿造成地下水降压的因素和机制

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-07-10 DOI:10.1007/s40789-024-00716-7
M. Chen, C. Zhang, I. Canbulat, S. Saydam, G. Fan, D. Zhang
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引用次数: 0

摘要

评估采矿对地下水的影响是长壁延伸和可持续发展的重要考虑因素之一,但通常受到有限数据可用性、水文地质变化和复杂的水力机械耦合行为的限制。本文旨在确定地下水减压的因素和机制,找出知识差距和方法限制,以改进地下水影响评估。对澳大利亚、中国和美国煤田脱水案例的分析表明,压降会进一步导致地表水文退化,而水力反应则随长壁参数和地质条件的不同而变化。对 422 个压裂数据集高度的统计解释表明,地下水影响与面板几何形状和覆盖深度呈正相关,在面板相互作用和顶煤塌陷情况下更为明显。原位应力、岩石能力、粘土矿物充填、断层、山谷地形以及地表水与地下水的相互作用等地质和水文地质因素影响着地下水水力学和长期恢复。脱水机制包括渗透性增强和通过断裂网络的广泛流动,其中相互连接的断裂提供了陡峭的水力梯度和通畅的水流路径,将上覆水排到水头较低的沟谷中。未来的研究应改进断裂网络的识别和互联量化,同时描述高断裂频率和大断裂孔径背景下的流体流动动态。论文建议建立一个研究框架,以持续的数据收集和现场规模的数值建模作为关键技术支持,解决知识差距问题。论文巩固了对长壁开采影响矿井水文的认识,并提供了有助于改进地下水降压评估的观点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Assessment of factors and mechanism contributing to groundwater depressurisation due to longwall mining

Assessment of mining impact on groundwater is one of critical considerations for longwall extension and sustainability, however usually constrained by limited data availability, hydrogeological variation, and the complex coupled hydro-mechanical behaviour. This paper aims to determine the factors and mechanism of groundwater depressurisation and identify knowledge gaps and methodological limitations for improving groundwater impact assessment. Analysis of dewatering cases in Australian, Chinese, and US coalfields demonstrates that piezometric drawdown can further lead to surface hydrology degradation, while the hydraulic responses vary with longwall parameters and geological conditions. Statistical interpretation of 422 height of fracturing datasets indicates that the groundwater impact positively correlates to panel geometry and depth of cover, and more pronounced in panel interaction and top coal caving cases. In situ stress, rock competency, clay mineral infillings, fault, valley topography, and surface–subsurface water interaction are geological and hydrogeological factors influencing groundwater hydraulics and long-term recovery. The dewatering mechanism involves permeability enhancement and extensive flow through fracture networks, where interconnected fractures provide steep hydraulic gradients and smooth flow pathways draining the overlying water to goaf of lower heads. Future research should improve fracture network identification and interconnectivity quantification, accompanied by description of fluid flow dynamics in the high fracture frequency and large fracture aperture context. The paper recommends a research framework to address the knowledge gaps with continuous data collection and field-scale numerical modelling as key technical support. The paper consolidates the understanding of longwall mining impacting mine hydrology and provides viewpoints that facilitate an improved assessment of groundwater depressurisation.

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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
期刊最新文献
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