Anomalous Increases in Piezometric Levels in Advance of Longwall Mining Subsidence

Booth, Colin J.; Curtiss, Alan M.; DeMaris, Philip J.; Roosendaal, D.J. Van

doi:10.2113/gseegeosci.v.4.407

Cited by 2 publications

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“…Regarding theoretical studies, early studies on mining subsidence originated in Belgium. In 1825, a relevant investigation on the surface damage of Liege City proved that the surface damage was mainly caused by mining operations within a depth of 90 m, and mining depth played a decisive role in surface damage [6]. The "perpendicular theory" and "normal theory" about mining-induced damage were proposed [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Surface Subsidence Characteristics of Mining Panel Layout Configuration with Multi-Seam Longwall Mining

Zhu

Wang

Gao³

et al. 2023

Processes

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Mining-induced subsidence is critical for ecological environment reconstruction and damage prevention in coal mining areas. Understanding the characteristics of surface subsidence with multi-seam mining is the first step. Surface subsidence of different mining panel layout configurations was investigated by means of UDEC numerical simulation. Based on the simulation results, it was indicated that mining panel layout configuration had a significant impact on surface subsidence, including ground surface subsidence, horizontal displacement, crack propagation, and ground surface fissure development. The overlapped region of the upper panel and the lower panel is the key region, where existing bedding separations and strata cracks close and activate, the integrity and strength of the interburden layer are reduced, and the subsidence magnitude is enhanced. The subsidence profile of the overlapped region for the stacked configuration, external staggered, the edge of the lower panel internal staggered, two edges of the lower panel internal staggered are steeper and deeper, and the corresponding values of ground surface subsidence and horizontal displacement are greater than other regions. The ground surface fissures with the types of stepped, slided, and graben developed on the ground surface above the edge of the mining panel, and the development location is closely related to the strata movement edge. Because of the support activities of the reserved coal pillar, the ground subsidence of the external staggered (internal staggered) of the upper panel with the coal pillar is slight. The external staggered (internal staggered) and external staggered (internal staggered) of the upper panel with the coal pillar can be selected as the preferred layout configuration. The proposed description of surface subsidence of different mining panel layout configurations can be applied in subsidence prediction.

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Section: Introductionmentioning

confidence: 99%

Surface Subsidence Characteristics of Mining Panel Layout Configuration with Multi-Seam Longwall Mining

Zhu

Wang

Gao³

et al. 2023

Processes

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

Chen,

Zhang,

Canbulat

et al. 2024

Int J Coal Sci Technol

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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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Anomalous Increases in Piezometric Levels in Advance of Longwall Mining Subsidence

Cited by 2 publications

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Surface Subsidence Characteristics of Mining Panel Layout Configuration with Multi-Seam Longwall Mining

Surface Subsidence Characteristics of Mining Panel Layout Configuration with Multi-Seam Longwall Mining

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

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