Impact of longwall mining on groundwater above the longwall panel in shallow coal seams

Li, Yang; Peng, Syd S.; Zhang, Jinwang

doi:10.1016/j.jrmge.2015.03.007

Cited by 27 publications

(12 citation statements)

References 1 publication

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“…where q pl /k 11 is a particular solution of Eq. (11). Based on the relation between ω 11 and ω 21 in Eq.…”

Section: Geofluidsmentioning

confidence: 99%

“…Besides, SBCM can improve the mining rate efficiently, especially for mining the coal resources under the surface water bodies, buildings, and railways (roads) [1]. In addition, compared with the traditional underground coal mining technol-ogy, the backfill can support the overburden strata in SBCM, which can effectively reduce a series of problems caused by overburden strata deformation and failure, such as surface subsidence [10,11] and water resources loss [12][13][14][15][16]. Therefore, it is of great significance to study the deformation and stress distribution of overburden strata for SBCM engineering.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Analysis on Stress and Deformation of Overburden Key Stratum in Solid Filling Coal Mining Based on the Multilayer Winkler Foundation Beam Model

Guo

Zhang

et al. 2021

Geofluids

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Solid backfill coal mining (SBCM) is a green mining technology which can effectively alleviate the environmental problems induced by traditional coal mining techniques, such as surface subsidence, water resources loss, coal gangue occupation, and pollution. In this study, a multilayer Winkler foundation beam model for the overburden key strata is proposed, and the model with two key strata is solved. The subsidence, rotating angle, inner force, and stress of the overburden key strata are systematically analyzed under various backfill elastic modulus, mining height, and soft layer thickness. The results show that the subsidence of the key strata exhibit “basin”-shape curves, and the backfill elastic modulus, mining height, and the thickness of the soft strata have significant influences on the subsidence of the key strata. The shear stress, horizontal stress, and vertical stress of key stratum can be effectively reduced by increasing the backfill elastic modulus. The increase of mining height has little influence on the stress of key stratum that close to the coal seam (key stratum #1), but has a significant effect on the stress of key stratum that above the soft layers (key stratum #2). On the contrary, the effect of increasing soft layer thickness on the stress of key stratum is opposite to that of increasing mining height. In addition, the shear failure of key stratum #1 at mining boundary and the tensile failures on both sides of mining boundary should be preferentially considered in SBCM engineering design. Due to the low shear stress level of key stratum #2, the tensile failure on both sides of the mining boundary should be mainly considered.

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“…where q pl /k 11 is a particular solution of Eq. (11). Based on the relation between ω 11 and ω 21 in Eq.…”

Section: Geofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis on Stress and Deformation of Overburden Key Stratum in Solid Filling Coal Mining Based on the Multilayer Winkler Foundation Beam Model

Guo

Zhang

et al. 2021

Geofluids

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show abstract

“…e accumulation of coal gangues has caused a series of environmental problems [1][2][3], such as land occupation, water pollution, and air pollution after spontaneous combustion [4][5][6][7]. In addition, coal mining can also cause the fracture of key strata [8][9][10][11], resulting in the loss of groundwater resources [12][13][14] and surface subsidence [15,16]. Solid backfill mining is an environmental coal mining technology, in which coal gangue is used as the main filling body to replace the underground coal resources [17,18].…”

Section: Introductionmentioning

confidence: 99%

Constitutive Model of Solid Backfill Materials and Numerical Simulation of Overburden Movement and Deformation in Backfill Mining

Zhang

et al. 2021

Shock and Vibration

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Solid backfill mining is an efficient and environmental-friendly coal mining technology, which can effectively solve the problems of coal gangue pollution, water resource loss, and surface subsidence. Based on the mechanical behavior of backfill materials in the compaction process, volume strain was used to express the deformation modulus, and a constitutive model of backfill materials was proposed in this study. The ABAQUS UMAT was used to develop the numerical calculation subroutine of the model. Finally, the rationality of the model was verified that simulated stress-strain curves of the backfill materials during the compaction process agree well with experiments. Based on the proposed constitutive model, the influence of three factors (the initial compaction rate of the filling body, the mining height, and the mining depth) on the key strata and surface subsidence was analyzed systematically. The results show that the initial compaction rate and the height of coal seams have significant influences on surface subsidence. When the thickness of topsoil is only changed and the structural composition and lithology of overburden are not changed, the mining depth has little influence on surface subsidence, but a significant influence on surface subsidence range. The influence of mining height and mining depth on the deformation of key strata of overburden and surface subsidence is approximately linear, while the influence of the initial compaction rate is nonlinear.

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“…However, overlying strata collapse and mining-induced fractures caused by underground coal mining may lead to a series of ecological problems, such as the decline of the aquifer water level, the loss of shallow water resources, and the desertification of land [4][5][6][7]. In China, such problems are frequent in coal mines in the North Shaanxi, Huanglong, Shendong, Ningdong, and Xinjiang provinces of northwest China, which are located in arid and semi-arid areas with scarce surface and groundwater resources and a fragile ecological environment [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Impact of Mine Panel Size on Hydraulic Permeability of Weakly Cemented Strata

et al. 2020

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The effect of underground coal mining on groundwater, ranging from minimal to severe depending on the mined-out panel size, is primarily associated with the change in ground hydraulic permeability. This paper presents a novel panel design method, taking consideration of reducing water loss during the mining operation, which is based on evaluating and ranking the impact of panel size on the hydraulic permeability of weakly cemented strata. The permeability test results of weakly cemented rock samples collected in the Yili No.4 Coal Mine in Xinjiang, China strongly indicates that, in contrast to common rock, their post-peak permeability during the total stress-strain process is lower than the initial permeability due to high porosity and the presence of clay minerals. A numerical modeling based on strain-permeability functions reveals that the post-mining permeability distribution in the weakly cemented overlying strata could be subdivided into three zones: the permeability reduction zone, the permeability restoring zone, and the permeability high-increment zone. The impact significance of different size factors on the post-mining permeability of overlying strata can be ranked in decreasing order as follows: mining height, panel width, and panel length, the quantification of which was based on the variance analysis of such indices as maximum pore pressure and maximum flow velocity. Based on the above findings, the optimal size of panel 21103 in the Yili No.4 Coal Mine was determined and validated by water level field observations.

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Impact of longwall mining on groundwater above the longwall panel in shallow coal seams

Cited by 27 publications

References 1 publication

Theoretical Analysis on Stress and Deformation of Overburden Key Stratum in Solid Filling Coal Mining Based on the Multilayer Winkler Foundation Beam Model

Theoretical Analysis on Stress and Deformation of Overburden Key Stratum in Solid Filling Coal Mining Based on the Multilayer Winkler Foundation Beam Model

Constitutive Model of Solid Backfill Materials and Numerical Simulation of Overburden Movement and Deformation in Backfill Mining

Impact of Mine Panel Size on Hydraulic Permeability of Weakly Cemented Strata

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