Analysis of global and local stress changes in a longwall gateroad

Tulu, Ihsan Berk; Esterhuizen, G.S.; Gearhart, David F.; Klemetti, Ted; Mohamed, Khaled; Su, Daniel

doi:10.1016/j.ijmst.2017.11.015

Cited by 25 publications

(8 citation statements)

References 3 publications

(4 reference statements)

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“…Consequently, all of these parameters had to be estimated. The roof layers were simulated using the strain-softening ubiquitous joint constitutive (SUBI) model [47] with the parameters taken from a paper by Tulu et al [48] that provides practical estimates of SUBI input parameters for various coal measure rocks. The layers below the coal seam were modeled as elastic, as heaving issues or floor damage were not observed at the site.…”

Section: Flac3d Model Setupmentioning

confidence: 99%

Application of an Integrated 3D–2D Modeling Approach for Pillar Support Design in a Western US Underground Coal Mine

Sinha,

Walton

2023

Geosciences

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Discontinuum Bonded Block Modeling (BBM) represents a potential tool for support design, as these models can reproduce both the rock fracturing process and the influence of reinforcement on unsupported ground. Despite their strengths, discontinuum models are seldom used for mining design due to their computationally intensive nature. This study is an application of an integrated 3D continuum–2D discontinuum approach, in which the mine-wide stress distribution process is modeled using a continuum software, and the local deformation behavior in response to a strain path from the continuum model is simulated with a 2D discontinuum software. In June 2017, two multi-point borehole extensometers were installed in a longwall chain pillar to record ground displacements as a function of the longwall face position. The data from one of the extensometers were employed to calibrate a panel-scale FLAC3D model. The boundary conditions along the pillar slice containing the extensometer were extracted from the FLAC3D model and applied to a 2D BBM, and the input parameters were modified to match the extensometer data. The calibrated BBM was able to reproduce the unsupported rib deformation and depth of the fracturing well. Subsequently, a few support schemes were tested to demonstrate how the incorporation of support might affect rib deformation.

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Section: Flac3d Model Setupmentioning

confidence: 99%

Application of an Integrated 3D–2D Modeling Approach for Pillar Support Design in a Western US Underground Coal Mine

Sinha,

Walton

2023

Geosciences

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“…This fluid-flow and solid deformation problem gets a lot of attention. Scholars have proposed many models to analyze the coal and CH 4 interaction [7][8][9]. In deep strata, temperature has a significant effect on coal seams.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on gas seepage characteristic based on coal-gas interaction model

et al. 2019

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The temperature has a significant impact on the coal seam gas extraction. A fully coupled model is established in this study, which takes into account the coal-gas interaction characteristic. The numerical result shows that the coalbed CH 4 migratio and transport evolution coal bed CH 4 reservoir is not only dependent on the coal matrix deformation, gas pressure and gas adsorption, but also closely related to temperature.

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“…During underground coal mining, mining disturbances weaken the mechanical properties of coal, as well as affect the fracture distribution and permeability of coal. These conditions can occasionally cause rock burst and coal and gas outburst [4][5][6]. A great deal of energy is accumulated in the deep coal seam.…”

Section: Introductionmentioning

confidence: 99%

Deformation, Permeability and Acoustic Emission Characteristics of Coal Masses under Mining-Induced Stress Paths

et al. 2018

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The geomechanical and seepage evolution characteristics of coal masses during mining are the key factors that affect the drainage of coalbed methane and the safety of coal mining. Nevertheless, the influence of mining paths on coal seam permeability is rarely investigated given the complexity of mining-induced stress experiments. To study the effect of mining-induced stress on coal mining, the mechanical properties, acoustic emission characteristics and energy evolution of coal masses were experimentally evaluated through mining-induced stress experiments. Experimental results indicated that at peak intensity, the deviatoric stress and axial strain of coal samples under the stress path of protective coal-seam mining are lower than those of coal samples under the non-pillar stress path. The unloading ratio of confining pressure is large under a stress path of non-pillar mining, and the elastic energy, the absorbed energy, and the dissipated energy of coal mass are low during destruction. The effect of high confining pressure on AE events is pronounced under the non-pillar mining path. The overall b value under high confining pressure is smaller than that under low confining pressure, and AE events generally have high energy. The fracture structure of coal mass is complex, and the fractal size of coal is large under high unloading rates of confining pressure, which induce the increase of permeability after coal destruction.

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Analysis of global and local stress changes in a longwall gateroad

Cited by 25 publications

References 3 publications

Application of an Integrated 3D–2D Modeling Approach for Pillar Support Design in a Western US Underground Coal Mine

Application of an Integrated 3D–2D Modeling Approach for Pillar Support Design in a Western US Underground Coal Mine

Effect of temperature on gas seepage characteristic based on coal-gas interaction model

Deformation, Permeability and Acoustic Emission Characteristics of Coal Masses under Mining-Induced Stress Paths

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