Sensitivity analysis of key factors influencing compression-induced deformation of waste rocks for backfilling to reduce environmental pollution

Meng, Lingkui; Meng, Guohao; Zhang, Jixiong; Huang, Peng; Germain, Deon

doi:10.1007/s11356-019-06932-y

Cited by 7 publications

(3 citation statements)

References 35 publications

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“…Combined with Eqs. ( 15), (18), and ( 19), it can be easily obtained that C 9 = C 12 = C 13 = C 16 = 0. In addition, the rotating angle and shearing force are 0 when x = 0, and the deflection, rotating angle, bending moment, and shearing force are continuous when x = L 1 ; then,…”

Section: Geofluidsmentioning

confidence: 93%

“…The research on SBCM mainly focuses on the backfill material and the overburden control. At present, the mechanical properties, components, and particle sizes of backfill materials have relatively systematic research results [17][18][19][20][21]. However, to the best of our knowledge, there are few theoretical and numerical modeling studies on the overburden strata control.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Geofluidsmentioning

confidence: 93%

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

View full text Add to dashboard Cite

show abstract

“…e mechanical properties of backfill materials determine the control ability of backfill mining on the movement and deformation of overburden. At present, the studies on mechanical behavior of backfill materials have been systematically studied, including the axial stress-strain curve of the compacted cylinder [22,23], the creep relaxation [24], the influence of particle size ratio on the mechanical behavior [1], and the influence of confining pressure and lateral pressure on mechanical properties [25].…”

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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The 3D reconstruction of a digital model for irregular gangue blocks and its application in PFC numerical simulation

Huang

et al. 2021

Engineering with Computers

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Sensitivity analysis of key factors influencing compression-induced deformation of waste rocks for backfilling to reduce environmental pollution

Cited by 7 publications

References 35 publications

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

The 3D reconstruction of a digital model for irregular gangue blocks and its application in PFC numerical simulation

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