Feasibility study and performance optimization of sand-based cemented paste backfill materials

Zhou, Nan; Zhang, Jixiong; Ouyang, Shenyang; Deng, Xuejie; Dong, Chaowei; Du, Erbao

doi:10.1016/j.jclepro.2020.120798

Cited by 97 publications

(34 citation statements)

References 19 publications

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“…, the volume strain is the volume strain stored in the previous loading step for updating the deformation modulus. (3) e deformation modulus is updated by equation (5), and then the Jacobian matrix is updated, and the current volume strain is stored. (4) After the end of the incremental step, ABAQUS main program can automatically perform the convergence judgment.…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…In traditional coal mining, coal gangue will be generated during the roadway excavation and coal washing, accounting for about 15% of the total weight. 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].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Shock and Vibrationmentioning

confidence: 99%

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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“…Backfilling materials with high compaction and low permeability are usually needed to ensure the reliability of backfill mining. The sand-based cemented backfill (SBCB) method is a mining technology with small ecological and environmental damage [12][13][14]. SBCB has high compactness and good control against overlying strata deformation.…”

Section: Introductionmentioning

confidence: 99%

Permeability of Sand-Based Cemented Backfill under Different Stress Conditions: Effects of Confining and Axial Pressures

et al. 2021

Self Cite

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Sand-based cemented backfill (SBCB) mining technology is instrumental in utilizing coal resources buried under the water bodies. SBCB is exposed to the long-term action of mining-induced stresses in the goaf and groundwater permeating via microcracks along the rock strata. Studying the permeability evolution of SBCB under varying stress states is crucial for protecting coal and water resources below the aquifer. This study is focused on the influence law of different stress states on the SBCB permeability exposed to groundwater, which was tested under different axial and confining pressures using a laboratory seepage meter, particle size analyzer, scanning electron microscope (SEM), and X-ray diffractometer (XRD). Best-fitting quadratic polynomials linking the SBCB permeability with confining and axial pressures, respectively, were obtained via statistical processing of test results. The permeability gradually dropped within the elastic range as the confining and axial pressures increased. Moreover, an increase in the confining pressure caused a more dramatic reduction in the SBCB permeability than the axial pressure. Finally, the SBCB seepage mechanism under different stress states was revealed based on the particle size analysis, XRD patterns, and SEM microstructure. These findings are considered instrumental in substantiating safe mining of coal resources below the water bodies and above the confined groundwater.

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“…The backfill normally consists of industrial wastes, such as coal gangue and fly ash [3][4][5]. In this respect, SBCM can effectively alleviate the environmental problems caused by gangue discharge in coal mining, including occupying the ground and spontaneous combustion [6][7][8][9]. Besides, SBCM can improve the mining rate efficiently, especially for mining the coal resources under the surface water bodies, buildings, and railways (roads) [1].…”

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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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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Feasibility study and performance optimization of sand-based cemented paste backfill materials

Cited by 97 publications

References 19 publications

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

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

Permeability of Sand-Based Cemented Backfill under Different Stress Conditions: Effects of Confining and Axial Pressures

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

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