An improved model to predict the water-inrush risk from an Ordovician limestone aquifer under coal seams: a case study of the Longgu coal mine in China

Niu, Huigong; Wei, Jiuchuan; Yin, Huiyong; Zhang, Weijie

doi:10.1007/s13146-020-00590-9

Cited by 12 publications

(2 citation statements)

References 44 publications

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“…The relevant research results of weakly cemented rocks focus on the basic physical and mechanical properties, seepage characteristics, and micro components [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. The possibility of forecasting the UCS of weakly cemented rocks using their unit weight, P-wave velocity, tensile strength, and elastic modulus was investigated by Wang et al [32].…”

Section: Introductionmentioning

confidence: 99%

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

Guo

Yang

et al. 2022

Geofluids

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The weakly cemented rock layer is easily damaged under the combined effect of seepage and mining disturbance and creates massive engineering disasters. This paper uses the self-designed weakly cemented remodeling mechanism to prepare weakly cemented rock samples with clay minerals accounting for 20%, 30%, 40%, 50%, and 60% of the total. The MTS816 system, in conjunction with an acoustic emission system and a high-speed camera, completed mechanical and seepage tests on the sample. The results show that when the quantity of clay minerals increases, the uniaxial compressive strength, elastic modulus, and rapid crack propagation stress of the weakly cemented rock samples decrease. Initial stress of crack development increases and then decreases, as well as the sample’s failure mode changes from shear to tensile. The sample’s permeability increases with increasing osmotic and axial pressure differential but decreases with increasing confining pressure under the same amount of clay minerals. The sensitivity of permeability to changes in osmotic pressure differential, axial pressure, and confining pressure increases as the amount of clay minerals increases. The mechanical and seepage characteristics can show significant changes in clay minerals in 20% to 30%.

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Section: Introductionmentioning

confidence: 99%

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

Guo

Yang

et al. 2022

Geofluids

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“…The complexity degree of geological structure studied by the intensity index, density of fault intersections, and endpoints has been put forward [6]. The thickness of aquicludes influencing on waterinrush resistance and water-filled channels is analyzed with the combination of rock lithology, such as the thickness and ration of sandstone and mudstone [7]. The theory of key strata is introduced to explain the result of water outbursts, that is, whether water inrush occurs or not mainly depends to a great extent on the key layers that consist of rock strata with high strength and low permeability [8,9].…”

Section: Introductionmentioning

confidence: 99%

Application and Evaluation of Regional Control Technology of Limestone Water Hazard: A Case Study of the Gubei Coal Mine, North China

Zhu

Liu

et al. 2021

Geofluids

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The coal-forming period is mainly Permian and Carboniferous in the North China coalfield, which is one of the main coal accumulating areas in China. It is characterized by high coal rank, abundant reserves, and varieties. However, water outburst accidents originating from karst aquifers under the coal seam floor have become a terrible disaster in accompany with the deep coal exploited progressively. Water inrush events of the deep limestone have often occurred during excavation in mines. To decrease the risk of high confined water from the coal seam floor and ensure the mining under the safe water pressure of limestone aquifers, the comprehensive exploration and regional treatment are all implemented, such as drainage depressurization, curtain grouting, and grouting transformation of aquifers. Through the comprehensive treatment of the ground and underground, the water channel will be effectively filled with slurry to prevent limestone water bursting into the roadway, and the value of water-inrush coefficient is decreased below the critical value. In the study, utilizing COMSOL Multiphysics based on the finite element method to verify and determine the real layout of grouting parameters, the result shows the design plans satisfy the engineering requirements. 13321 working face located in South No.1 mining area has analyzed the effect of water hazard prevention and control. On the basis of the analysis of geophysical prospecting and validation boreholes, it is concluded that the fracture is filled with grouting slurry to block water-conducting channel effectively. In turn, the rational design parameters of grouting are confirmed as well. Finally, the water-inrush coefficient of Taiyuan formation limestone and Ordovician limestone water is calculated, respectively. The result shows that water-inrush coefficient is less than the critical value after treatment, the safety of excavating coal seam can be further assured.

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Visualization Analysis and Progress of Mine Water Inrush Disaster-Related Research

et al. 2022

Mine Water Environ

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An improved model to predict the water-inrush risk from an Ordovician limestone aquifer under coal seams: a case study of the Longgu coal mine in China

Cited by 12 publications

References 44 publications

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

Application and Evaluation of Regional Control Technology of Limestone Water Hazard: A Case Study of the Gubei Coal Mine, North China

Visualization Analysis and Progress of Mine Water Inrush Disaster-Related Research

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