Application of solid backfilling to reduce hard-roof caving and longwall coal face burst potential

Zhang, Jixiong; Li, Baiyi; Zhou, Nan; Zhang, Qiang

doi:10.1016/j.ijrmms.2016.07.025

Cited by 97 publications

(56 citation statements)

References 14 publications

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“…In the past few decades, non-pillar mining by filling artificial materials has been tested in many mines. However, the filling body is also a stress-concentrated area just as is the narrow coal pillar [37][38][39]. Additionally, excessive consumption of filling materials also sets limits on the popularity of this kind of mining pattern [40,41].…”

Section: Optimization Of the Entry Stability In Longwall Miningmentioning

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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Section: Optimization Of the Entry Stability In Longwall Miningmentioning

confidence: 99%

Analysis and Optimization of Entry Stability in Underground Longwall Mining

et al. 2017

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“…This, refers to the strong, thick, high rock strength, integrated, and flawless seam that do not collapse within a short period of time [1][2][3][4]. Owing to the significant variability of hard roof conditions in China, the thickness of such roofs varies from tens to hundreds of meters.…”

Section: Introductionmentioning

confidence: 99%

“…The coal reserves under hard roofs account for about one-third of the total reserve in China. Moreover, nearly 40% of fully mechanized coal mining panels have hard roofs and more than 50% of mining areas suffer from problems associated with hard roofs [2,15]. In order to mitigate the effect of the HMR in mining, the energy accumulated in the hanging roof and the caving height of the roof should be reduced [16].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the physical and chemical reactions between the rock and the water lead to the degraded mechanical performance of the roofs [26]. For backfill, the backfilling material is used to fill up the gob in order to control strata movement and deformation [2,7,27]. Together, this would result in reduced bearing capacity and easier caving.…”

Section: Introductionmentioning

confidence: 99%

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A Case Study of Presplitting Blasting Parameters of Hard and Massive Roof Based on the Interaction between Support and Overlying Strata

Zhang

Chen

2018

Energies

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Due to the existence of a hard and massive roof (HMR), severe ground pressure behaviors have been observed at the working face, resulting in safety issues and the degradation of production effectiveness. Based on the HMR conditions of the Datong Mining Area, the fracture-related instability of the HMR and its effects on the support selection were investigated by analyzing the interaction between support and overlying strata. Advancefixed-distance presplitting blasting (AFPB) technology was proposed to control the caving interval of HMR, and the influence of the controlled interval on the working load of supports was also analyzed. The working load of the support and the caving interval of the HMR were determined based on the controlled HMR fracture technology, and these were verified by field application tests. The working resistance of the support and the step distance were determined based on controlled roof fracture and were verified by on-site application experiments. The results revealed that cracks emerged after the presplitting blasting, resulting in significantly reduced strata behaviors. Furthermore, the support exhibited good adaptability.

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“…The hard roof is one of the main causes of a coal mine burst at the longwall face [8,9]. It is of great importance to note that in China, coal reserves under hard roofs account for about one-third of total reserves; moreover, nearly 40% of fully mechanized coal mining panels have hard roofs, and more than 50% of mining areas suffer from problems associated with hard roofs [10,11].…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Hard Roofs in Solid Backfill Coal Mining Using Physical Models

et al. 2017

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Solid backfill coal mining technology has been widely applied in coal seams that are at risk of hard roof. Using actual measured strain-stress curves of the backfill body and the similarity theory, this study designed and employed four experimental models for physical simulation, corresponding to roof-controlled backfilling ratios of 0%, 40%, 82.5% and 97% using the geological conditions of Face No. 6304 in the Jining No. 3 coal mine-a solid backfill coal mining face under a hard roof. A non-contact strain measurement system and pressure sensors were used to monitor the deformation of the overlying strata and changes in abutment stress ahead of the face during mining of the models for varying roof-controlled backfilling ratios. The results indicated that the solid backfill body was able to support the roof. As the roof-controlled backfilling ratio was increased, the maximum subsidence of the roof and the maximum height of the cracks decreased. When the roof-controlled backfilling ratio was 82.5% or higher, the working face did not display any obvious initial fractures or periodic fractures, and both the value and the impact range of the abutment stress ahead of the face decreased.

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Application of solid backfilling to reduce hard-roof caving and longwall coal face burst potential

Cited by 97 publications

References 14 publications

Analysis and Optimization of Entry Stability in Underground Longwall Mining

Analysis and Optimization of Entry Stability in Underground Longwall Mining

A Case Study of Presplitting Blasting Parameters of Hard and Massive Roof Based on the Interaction between Support and Overlying Strata

Deformation Behavior of Hard Roofs in Solid Backfill Coal Mining Using Physical Models

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