Overview of goaf water hazards control in China coalmines

Gui, Herong; Qiu, Huili; Qiu, Weizhong; Tong, Shijie; Zhang, Hongzhong

doi:10.1007/s12517-018-3391-z

Cited by 18 publications

(8 citation statements)

References 8 publications

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“…As shown in Figure 5, mining in coal seam 8 # could enable the fissure zone to channel gob-water into coal seam 7 # because water would seep through the fissures into the caving zone. In this scenario, the water flow is relatively less destructive (Liao 2015;Gui et al 2016c). However, if the caving zone channels the gob-water into coal seam 7 # , the flow rate would be higher through the gaps between rocks in the caving zone, maximizing flow velocity and volume, and generating high water pressure and strong kinetic energy, and thus causing extensive destruction.…”

Section: Iii: Water-inrush Via Fissure or Caving Zonesmentioning

confidence: 99%

Patterns of gob-water inrush in Chinese coalmines

Gui

Lin

2017

Water Practice and Technology

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Gob-water is a serious hazard in Chinese coalmines. Such inrushes have caused more than 80% of the coalmine water accidents recorded in recent years. This study is based on reviews of past gob-water hazard cases in China. Six inrush patterns are suggested, caused by gobs exposed by tunneling, channeled by faults, or fissure or caving zone channeling, damage to or collapse of water-resistant coal pillars and multi-factor interactions. The results are of relevance in all coal-producing countries wishing to contain and treat gob-water hazards.

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Section: Iii: Water-inrush Via Fissure or Caving Zonesmentioning

confidence: 99%

Patterns of gob-water inrush in Chinese coalmines

Gui

Lin

2017

Water Practice and Technology

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“…Grouting is a well-known approach to preventing water bursting in coal mines [1][2][3]. As it is a massive work for water grouting sealing in coal mines, pipe blockage is not allowed during the grouting processes whereas water grouting sealing is expected to be soon as possible, the strength of the hardened body is desired to be reasonable against stratum movement, and the contents of grouting materials are hoped to be of low cost and available nearby.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mixture Ratio and Diffusion Performance of Grouting Materials for Water Bursting Prevention in Coal Mines

Lian

Dai

et al. 2021

Advances in Materials Science and Engineering

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Grouting is a common and important technique for water bursting prevention in coal mines; the success of grouting in coal mines depends highly on the flowability of grouting materials and the strength of the hardened body as well. In this paper, a series of performance tests, in terms of the water-cement ratio, viscosity, drainage rate, presetting time, final setting time, compressive strength, and permeability were conducted on the cement-fly ash-based grout at various mixture ratios. The evolution of these performances versus different mixture ratios was analyzed; targeting at the reasonable flowability and hardened strength of grouting materials, an optimized mixture ratio was recognized for water bursting prevention in coal mines. Furthermore, the diffusion experiments of optimized grout material were designed taking into account the influence of confining and hydraulic pressure in the porous medium. As a result, the confining and hydraulic pressures have a linear negative correlation with the diffusion distance of grout materials. These results have guiding significance to water bursting prevention in coal mines.

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“…Wang and Zhang proposed a numerical simulation method for fracture propagation and closure under seepage stress coupling that was modeled using the extended finite element method based on the research background of fractures and voids [17]. Gui et al reported that the primary cause of karst water inrush was the coupling effect of mining stress and bottom seepage [18]. Yi, Xiao, Tan, Ferfera, Chen, and Sheng-Qi Yang et al conducted rock damage experiments on rocks of different lithologies and concluded that the permeability of rocks changes significantly after damage [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage‐Damage Coupling

Pang

Feng

Jiang

et al. 2020

Advances in Civil Engineering

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To analyze the internal pore evolution law of aquifer rock in a coal mining front under the coupling effect of stress and seepage and the influence on the water inrush performance of the working face, research on the working face was conducted to improve the RTR-1000 high-temperature and high-pressure rock triaxial mechanical testing system, using hollow cylindrical and complete sandstone samples and by considering the stress change law in the actual mining process as the reference loading path. At the initial stage of loading, the permeability of sandstone demonstrates a rapid downward trend within a small range of stress change, with a decline rate of 50%. At lower permeabilities, the fluctuation is small; the plastic and failure stages are transient, and the relationship curve between the horizontal permeability and the axial confining pressure of sandstone is divided into compaction, multiple fluctuations, surrender, and failure. In several stages, the sandstone lateral permeability experiment under the coupling effect of stress and seepage demonstrates that the permeability of the aquifer in the coal mining front is significantly reduced after the original rock stress is disturbed by mining, suggesting that the water inrush calculation of the traditional water-flowing fractured zone and caving zone aquifer rock permeability experiment is inaccurate. Further research can deepen the stress and seepage coupling evolution process under the action of working face water inrush.

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Overview of goaf water hazards control in China coalmines

Cited by 18 publications

References 8 publications

Patterns of gob-water inrush in Chinese coalmines

Patterns of gob-water inrush in Chinese coalmines

Experimental Investigation on the Mixture Ratio and Diffusion Performance of Grouting Materials for Water Bursting Prevention in Coal Mines

Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage‐Damage Coupling

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