Spatial assessment of open cut coal mining progressive rehabilitation to support the monitoring of rehabilitation liabilities

Lechner, Alex M.; Kassulke, Owen; Unger, C J

doi:10.1016/j.resourpol.2016.10.009

Cited by 61 publications

(35 citation statements)

References 32 publications

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“…Coal is among the most important foundational energies, accounting for approximately 30% of total energy consumption around the world [1,2]. Presently, longwall mining and room-and-pillar mining have been the two most popular methods for underground coal mining.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining

et al. 2017

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Gob-side entry retaining (GER) is a popular non-pillar mining technique regarding how to reserve a gateroad for the use of next panel mining. When used in thick coal seams, the conventional entry retaining method requires a huge amount of filling materials and may cause entry (gateroad) accidents. Thus, an innovative non-pillar longwall mining approach is introduced. First, structural and mechanical models were built to explore the mechanism of the new approach. The modeling results indicate that effective bulking of the gob roof and reasonable support of the entry roof were key governing factors in improving entry stabilities and reducing roof deformations. Accordingly, a directional roof fracturing technique was proposed to contribute to gob roof caving, and a constant resistance and large deformation anchor (CRLDA) cable was used to stabilize the entry roof. Subsequently, the evolutionary laws of the roof structure and stresses were explored using numerical simulation. It was found that the structure of the surrounding rocks around the retained entry changed significantly after roof fracturing. The stress-bearing center was transferred to the gob area, and the entry roof was in a low stress environment after adopting the approach. Finally, the approach was tested on a thick coal seam longwall mining panel. Field monitoring indicates that the retained entry was in a stable state and the index of the retained entry met the requirement of the next mining panel. This work provides an effective and economical approach to non-pillar longwall mining in thick coal seams.

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Section: Introductionmentioning

confidence: 99%

An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining

et al. 2017

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“…Finally, the vertical stress achieved equilibrium on the entry wall. (2). In terms of the stress magnitudes, the position of the stress peak was in front of the panel.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Coal is among the most important foundational energies, accounting for approximately 30% of the total energy consumption around the world [1,2]. For sustainable utilization of limited coal resources, it is imperative to increase the coal recovery rate and improve mining safety.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Entry Stability in Underground Longwall Mining

et al. 2017

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For sustainable utilization of limited coal resources, it is important to increase the coal recovery rate and reduce mine accidents, especially those occurring in the entry (gateroad). Entry stabilities are vital for ventilation, transportation and other essential services in underground coal mining. In the present study, a finite difference model was built to investigate stress evolutions around the entry, and true triaxial tests were carried out at the laboratory to explore entry wall stabilities under different mining conditions. The modeling and experimental results indicated that a wide coal pillar was favorable for entry stabilities, but oversize pillars caused a serious waste of coal resources. As the width of the entry wall decreased, the integrated vertical stress, induced by two adjacent mining panels, coupled with each other and experienced an increase on the entry wall, which inevitably weakened the stability of the entry. Therefore, mining with coal pillars always involves a tradeoff between economy and safety. To address this problem, an innovative non-pillar mining technique by optimizing the entry surrounding structures was proposed. Numerical simulation showed that the deformation of the entry roof decreased by approximately 66% after adopting the new approach, compared with that using the conventional mining method. Field monitoring indicated that the stress condition of the entry was significantly improved and the average roof pressure decreased by appropriately 60.33% after adopting the new technique. This work provides an economical and effective approach to achieve sustainable exploitation of underground coal resources.

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“…The QLUMP land use mapping methodology integrated satellite images together with field survey and local expert knowledge and provides the most reliable and accurate LULC for the region. We reclassified the mined land area based on a previous research [58,59] into four types including bare land, industrial, grazing and water, where the biophysical parameters were the same as the QLUMP classifications ( Table 2). All the spatial layers were processed in ArcGIS [60] and resampled to the same resolution of 90 m based on a majority for the categorical data and average values for the quantitative data.…”

Section: Data Sources and Processingmentioning

confidence: 99%

Ecosystem Services Mapping Uncertainty Assessment: A Case Study in the Fitzroy Basin Mining Region

Wang

Lechner

Baumgartl

2018

Water

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Ecosystem services mapping is becoming increasingly popular through the use of various readily available mapping tools, however, uncertainties in assessment outputs are commonly ignored. Uncertainties from different sources have the potential to lower the accuracy of mapping outputs and reduce their reliability for decision-making. Using a case study in an Australian mining region, this paper assessed the impact of uncertainties on the modelling of the hydrological ecosystem service, water provision. Three types of uncertainty were modelled using multiple uncertainty scenarios: (1) spatial data sources; (2) modelling scales (temporal and spatial) and (3) parameterization and model selection. We found that the mapping scales can induce significant changes to the spatial pattern of outputs and annual totals of water provision. In addition, differences in parameterization using differing sources from the literature also led to obvious differences in base flow. However, the impact of each uncertainty associated with differences in spatial data sources were not so great. The results of this study demonstrate the importance of uncertainty assessment and highlight that any conclusions drawn from ecosystem services mapping, such as the impacts of mining, are likely to also be a property of the uncertainty in ecosystem services mapping methods.

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Spatial assessment of open cut coal mining progressive rehabilitation to support the monitoring of rehabilitation liabilities

Cited by 61 publications

References 32 publications

An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining

An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining

Analysis and Optimization of Entry Stability in Underground Longwall Mining

Ecosystem Services Mapping Uncertainty Assessment: A Case Study in the Fitzroy Basin Mining Region

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