Analysis of the Harmfulness of Water-Inrush from Coal Seam Floor Based on Seepage Instability Theory

Kong, Heng; Miao, Xiaoyu; Wang, Luzhen; Zhang, Yu; Chen, Zhanqing

doi:10.1016/s1006-1266(07)60124-2

Cited by 47 publications

(33 citation statements)

References 1 publication

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“…The waterproof capacity of the aquiclude will be diminished once it has passed through the V-type fractures. At the same time, by comparing vertical displacement, horizontal displacement, curvature and horizontal strain, it was found that the horizontal strain could intuitively reflect the opening and closing of water flowing fractures, and inrush channels of aquiclude [31][32][33]. Therefore, horizontal strain was selected as a key index for assessing aquiclude stability.…”

Section: Stability Index Of Aquicludementioning

confidence: 99%

An Index of Aquiclude Destabilization for Mining-Induced Roof Water Inrush Forecasting: A Case Study

Fan

Zhang

et al. 2019

Water

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Aquiclude plays a critical role in the occurrence of mining-induced roof water inrush in underground coal mines. This paper proposes an assessment index for the evaluation of aquiclude stability and a threshold value of water inrush from the roof, based on a case study of roof water inrush accidents in Cuimu coal mine, China. The relation between roof water inrush and water level variation in the aquifer, and the characteristics of aquiclude deformation, were studied in this assessment. Using the developed assessment criteria, the likelihood of roof water inrush was categorized into different risk levels, which were followed by a proposal for roof water inrush control measures. The main findings of this study are: a) in Cuimu coal mine, the waterbody in the bed separation between the upper aquifer and the aquiclude directly causes the inrush, and inrush occurs after the water level declines in the aquifer; b) tension-induced horizontal strains of aquiclude can be regarded as the index to evaluate the stability of aquiclude affected by underground coal mining—roof water inrush occurs when the maximum horizontal strain reaches a threshold of 10mm/m—c) based on the critical mining height for aquiclude instability, and the different thicknesses of barrier layers, high-risk zones are identified and inrush controls are proposed.

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Section: Stability Index Of Aquicludementioning

confidence: 99%

An Index of Aquiclude Destabilization for Mining-Induced Roof Water Inrush Forecasting: A Case Study

Fan

Zhang

et al. 2019

Water

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“…Closed crushed-rocks area of embankment can be considered to be a porous medium, where, when external temperatures start to change, the air inside rocks could experience natural convection. Porous medium experiences a nonisothermal and nonsteady natural convection, so the continuity equation, momentum equation, energy equation, and Boussinesq approximation [11][12][13] were listed as follows:…”

Section: Mathematical Model and Indoor Experimentsmentioning

confidence: 99%

Analysis on Cooling Effect of Crushed-Rocks Embankment of Qinghai-Tibet High-Grade Road

Zhang

Gang-qiang

et al. 2015

Modelling and Simulation in Engineering

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In order to study the cooling effect of the crushed-rocks embankment, the permeability and the inertial resistance coefficient were measured by the wind tunnel test of spheres with a diameter of 20 cm, and then the stabilities of the closed crushed-rocks embankment with the wide pavement, the closed crushed-rocks embankment with the narrow pavement, and the duct-ventilated and closed crushed-rocks embankment were calculated. In the next 50 years, assuming that the temperature in Qinghai-Tibet plateau will rise by 2.6°C condition, the cooling effects of these three special high-grade embankment structures were studied. The test results and the numerical calculation results show that the relationship between pressure gradient and seepage velocity in the spheres layer diverges completely from Darcy’s law, and it shows a nice quadratic nonlinear relationship. Stabilities of those two closed crushed-rock embankments without the duct-ventilated structure could be destroyed because of the high permafrost temperature under embankments. The duct-ventilated and closed crushed-rocks embankment can cool down the permafrost effectively and raise the permafrost table and ensure the long-term thermal stability of permafrost under road.

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“…Yang et al [5] presented a fully coupled flow-stress-damage model to simulate the progressive development of fractures and the associated groundwater flow under incremental loading conditions resulted from mining processes. Kong et al [6] used a theory of seepage instability to estimate the harmfulness of water-inrush from a coal seam floor in a particular coal mine of Xuzhou Mining Group. Zhu et al [7] developed a numerical model of the key strata by using Dilian Mechsoft's Realistic Failure Process Analysis (RFPA2D) program to predict failure modes and to establish rules for safe mining above the aquifer.…”

Section: Introductionmentioning

confidence: 99%

Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer

Guo¹

2017

EARTH

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Floor water inrushes not only cause heavy casualties and property losses, but seriously restrict the production of coal mines. The aquiclude was simplified as the fixed-fixed beam under the uniform load, and critical break length formula of floor aquiclude in three failure modes including bending failure, shear failure and buckling of pressure bar were established. Then the critical lengths of aquiclude in three failure modes were calculated according to the geological and mining conditions of 15031 panel in Jiulishan coalmine. The results show that the critical break length in bending failure is the smallest, while the critical length in shear failure mode is the biggest. And failures of fixed-fixed beam in three failure modes all occur at two ends so that water inrush from floor may occur at open-off cut or working face. Additionally, three critical break lengths increase with aquiclude thickness but decrease with confined aquifer pressure. According to the calculated results, water inrush may occur at the working face or open-off cut when mining advance reaches 12.47 m, and thus three control measures of lowering aquifer pressure, increasing aquiclude thickness and shortening the distances of first and interval weighting of main roof were discussed. The conclusions can provide references to control water inrush from floor aquifer in coal mines.

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Analysis of the Harmfulness of Water-Inrush from Coal Seam Floor Based on Seepage Instability Theory

Cited by 47 publications

References 1 publication

An Index of Aquiclude Destabilization for Mining-Induced Roof Water Inrush Forecasting: A Case Study

An Index of Aquiclude Destabilization for Mining-Induced Roof Water Inrush Forecasting: A Case Study

Analysis on Cooling Effect of Crushed-Rocks Embankment of Qinghai-Tibet High-Grade Road

Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer

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