Coal mining above a confined aquifer

Wang, J.-A.; Park, H.D.

doi:10.1016/s1365-1609(03)00029-7

Cited by 117 publications

(42 citation statements)

References 1 publication

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“…Based on the test results that were described above (Figure 8), the research results indicate that the changes in the mud-water mixture inrush can be divided into four stages: (1) e preparation stage of mud-water mixture burst (OA curve segment): at this stage, seepage channels of mud-water mixture were not formed, and thus, there was no mud-water mixture collected at the outlet of the test apparatus. Meanwhile, hard plastic clay, which was filled in the fissure, developed into soft-plastic and fluid-plastic states under the effect of washout and erosion of mudwater mixture gradually.…”

Section: Resultsmentioning

confidence: 96%

“…Plenty of underground engineering constructions such as railway tunnel and coal extractions are threatened by various kinds of water inrush and mud gushing in China [1][2][3][4]. Research methods of theoretical analysis, laboratory experiments, field investigations, and numerical simulations have always been performed by many scholars and experts to discover the mechanisms and influential factors of water inrush and mud burst in fractured rock masses [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Mud-Water Inrush Characteristics through Rock Fractures

Zhao

Zhang

2018

Advances in Civil Engineering

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Fractured rock masses, which are widely distributed in the south of China, have an impartible relationship with mud-water inrush. In order to study the change laws of mud viscosity under different moisture content, flow property, and mechanism of mud-water inrush in fractured rock masses, a NDJ-8S rotary viscometer and a simulation model are used to carry out a series of experimental studies. Tests of mud viscosity show that mud viscosity depends on moisture content, and the relationship between viscosity and moisture content was proposed. Based on mud viscosity results, physical model tests' results indicated that the process of mudwater rush can be divided into four stages: that is, the preparation stage of mud-water mixture burst, the seepage period of mudwater mixture inrush, the nonstable period of mud-water mixture outburst, and the stable period of mud-water mixture outburst. e excavation disturbance, high water pressure, and effect of erosion and corrosion of water were identified as key factors which lead to mud-water inrush in fractured rock masses

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mud-Water Inrush Characteristics through Rock Fractures

Zhao

Zhang

2018

Advances in Civil Engineering

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“…Coal mining operation caused many problems such as ground settlement, shaft lining instability, surrounding strata deformation, aquifer leakage, rock burst, and water inrush [1][2][3][4][5][6][7][8][9]. Among them, serious shaft lining failures have often occurred in the eastern part of China, such as Datun, Xuzhou, Huaibei, Huainan, Yanzhou, and Yongxia, since 1987 [10].…”

Section: Introductionmentioning

confidence: 99%

Vertical Shaft Support Improvement Studies by Strata Grouting at Aquifer Zone

Yin

et al. 2018

Advances in Civil Engineering

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e shaft lining failure which occurs in deep alluvium is a sudden coal mine hazard. e strata grouting is one of the treatment methods for the shaft lining failure. To investigate the impact of grout injection pressure on the shaft lining, the field measurement and the numerical analysis of the shaft lining stress variation during the grouting were conducted. To improve the strata grouting, the underground continuous impervious curtain (UCIC) is proposed as a new method by using the chain conveyor cutter technique without the impact on the shaft lining. e effects of the new method were also analyzed by means of the numerical methods. e results show that the strata grouting in the deep alluvium needs a high injection pressure, and in the horizontal direction, the shaft lining sustains the repeat tensile and compressive force during the grouting process. e negative influence of strata grouting on the stability of the shaft lining is obvious and serious. e UCIC built around the shaft lining can restrain the stress concentration induced by the aquifer drawdown. e triangular UCIC has a similar effect as that of the vertical one, and the small angle is better for preventing the shaft lining failure.

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“…In summary, the previous research studies were divided into two aspects as follows: first, the development laws of mining fissure or caving zones were examined, for example, the study of the flow channel development laws of water-sand fluids [1][2][3][4][5][6][7]. The second aspect was the study of the water-sand inrush mechanism from the properties of the aquifers, which mainly focused on the examination of the water-rich characteristics of different aquifers and the critical hydraulic slopes of water-sand inrush [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Numerical Simulation Study of the Migration Law of Water-Sand Two-Phase Flow in Broken Rock Mass

Jiang

Chen

2018

Geofluids

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When the upper parts of coal resources are exploited, the mining overburden separated strata may easily connect with the upper unconsolidated aquifers. This may cause the water-sand two-phase fluids in the aquifers to flow underground through the falling broken rock mass. It has been found that it is difficult to eliminate sand after it has entered a mine, which tends to severely restrict the restorations of mines and causes significant economic losses. This paper studied a seepage system dynamic model of watersand two-phase fluids in broken rock mass based on related two-phase flow theories. In addition, using FORTRAN language, it established a numerical calculation program to study the migration law of water-sand two-phase fluids flowing into broken rock mass and determined the main influencing factors on the seepage characteristic parameters of water-sand two-phase fluids in broken rock mass and the amounts of sand losses.

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Coal mining above a confined aquifer

Cited by 117 publications

References 1 publication

Experimental Study on the Mud-Water Inrush Characteristics through Rock Fractures

Experimental Study on the Mud-Water Inrush Characteristics through Rock Fractures

Vertical Shaft Support Improvement Studies by Strata Grouting at Aquifer Zone

A Numerical Simulation Study of the Migration Law of Water-Sand Two-Phase Flow in Broken Rock Mass

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