Numerical Estimation of Suitable Gob-Side Filling Wall Width in a Highly Gassy Longwall Mining Panel

Zhang, Guangchao; Tan, Yunliang; Liang, Saijiang; Jia, Hong-guo

doi:10.1061/(asce)gm.1943-5622.0001217

Cited by 43 publications

(30 citation statements)

References 32 publications

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“…According to the geological conditions of panel 5312, the parameters z � 31.7 m, L � 30.6 m, and a � 3.7 m can be calculated by equations (6) and (7). According to previous research [9], the rotation angle of the main roof was set at 4°; hence, the relationship among the roof cutting, the wall force of the cantilever beam structure, and THAS is shown in Figure 5.…”

Section: Mechanical and Parameter Analysis Ofmentioning

confidence: 99%

“…For that reason, in-depth studies on the key technologies of GSER such as the surrounding rock activity, wall support, and roadway support have been conducted [5][6][7][8][9]. Because GSER is applied along the edge of the goaf after mining of the working face, the stability of the surrounding rock might depend on the mechanical response of roof failure.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Overburden Structure and Pressure‐Relief Effect of Hard Roof Blasting and Cutting

Liu

Dai

Jiang

et al. 2019

Advances in Civil Engineering

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When studying the pressure-relief effect of hard roof blasting and cutting, the roof-cutting position and angle obviously affect the stability of the rock surrounding the gob-side entry (GSE). In this paper, control of the large deformation of rock surrounding the GSE is evaluated on the basis of the overlying structure and pressure-relief principle caused by roof cutting. Moreover, a mechanics model of a three-hinged arch structure (THAS) and a universal distinct element code (UDEC) numerical model with regard to the overlying rock movement were established to study the relationship among the rotation angle of key blocks in the THAS, the width of the roadway and the wall force beside it, and the optimal cutting position and cutting angle to reveal the pressure-relief effect of roof blasting and cutting and its influence on the support stability of the roadway. The results show that the overlying rock can form a stable THAS after roof blasting and cutting and that the wall stress and the coal-wall displacement are small, which indicates that roof blasting and cutting results in obvious pressure relief. The wall force increases with an increase in the rotation angle of the key block and decreases with an increase in the roadway width. Moreover, the optimal roof-cutting position (5 m) and angle (15°) are obtained with the specific mining conditions. Finally, on-site monitoring of the anchor-cable force and support force in panel 5312 of the Jining no. 3 coal mine is used to verify the pressure-relief effect after roof blasting and cutting. The study results can provide a theoretical basis for reasonable technical means and optimization of supporting parameters in field observation and have important application value for roof cutting and pressure relief for GSE retaining (GSER) technology.

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Section: Mechanical and Parameter Analysis Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Overburden Structure and Pressure‐Relief Effect of Hard Roof Blasting and Cutting

Liu

Dai

Jiang

et al. 2019

Advances in Civil Engineering

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“…Longwall mechanized top coal caving mining (LMTCCM) is the most universal method for the mining of extra‐thick coal seams in China . A gob‐side entry (GSE) as walking, ventilation, and transportation passage is extremely important for the efficient production and safety of coal mines . The coal pillar width directly affects the stability of the GSE .…”

Section: Introductionmentioning

confidence: 99%

“…1 A gob-side entry (GSE) as walking, ventilation, and transportation passage is extremely important for the efficient production and safety of coal mines. 2 The coal pillar width directly affects the stability of the GSE. 3 The importance of the coal pillar width is mainly reflected in the following three aspects: (a) It influences the abutment stresses, surrounding rocks and occurrence environments of GSEs; (b) it affects the mining recovery rate of coal resources, and (c) it could isolate gangues, water, fires, and harmful gases in the gob.…”

Section: Introductionmentioning

confidence: 99%

Field and simulation study of the rational coal pillar width in extra‐thick coal seams

Zhao

2019

Energy Science & Engineering

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The principles of mining pressure in extra‐thick coal seams are different from those of medium‐thick and thick coal seams. Field investigation, laboratory test, and simulation analysis methods were used to study the correlation between the gob‐side entry (GSE) stability and coal pillar width during longwall top coal caving mining in extra‐thick coal seams. The test site is in Datong City, Shanxi Province, China. The mining pressure in N5209 tailgate with coal pillar of 30 m is severe based on the field investigations during the N5209 panel retreat. Global constitutive double‐yield and strain‐softening models were built to study the abutment pressures and plastic failure ranges of coal seams with different thicknesses and coal pillar widths. The simulation results show that the GSE with an 8‐m coal pillar is destressed and minimal GSE deformation occurs. In addition, the abutment stress in the coal pillar decreases with increasing coal seam thickness. The field tests indicate that the GSE with an 8‐m‐wide coal pillar is stable in extra‐thick coal seams. This study provides a reference for the coal pillar design in coal mines with similar geological and mining conditions.

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“…However, with the increase in mining depth, such conventional support systems normally failed as high stress and complex conditions such as faults, soft rock mass, etc. [3][4][5][6] Therefore, some compound support technologies were further applied to reduce the large convergence of roadway. For example, some scholars utilized composite support systems including "bolts-cables-shotcrete-square confined arch" and "bolts-cables-U-shaped steel set-shotcrete" for stabilizing deep roadway in coal mines.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on a novel support system for controlling roadway deformation in underground coal mines

Sun

Zhang

et al. 2019

Energy Science & Engineering

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Roadway stability in extremely soft coal mass is a typical challenge in deep underground mines, as the most widely adopted support structure such as rock bolting, compound support system normally fails. This paper proposed a novel prereinforcement method for coal roadway, that is, jet grouting (JG) technique, to improve the quality of surrounding soft coal mass and form a stable support structure namely jet grouted coalcrete. The field and laboratory tests were conducted for evaluating the applicability of JG and the mechanical parameters of coalcrete. A numerical model was verified by comparing the calculated results with field measurements. According to the confirmed model, three typical JG support schemes were performed to assess the roadway stability after JG. The results showed that the proposed JG schemes can reduce the deformation and failure zone of the roadway and optimize the stress states around the roadway. The mechanism related to these advantages was investigated.This study provides a promising idea for supporting soft coal roadway in deep underground coal mines, which can promote the JG application in the field. K E Y W O R D Scoalcrete, jet grouting technique, numerical modeling, roadway stability, soft coal mass

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Numerical Estimation of Suitable Gob-Side Filling Wall Width in a Highly Gassy Longwall Mining Panel

Cited by 43 publications

References 32 publications

Analysis of Overburden Structure and Pressure‐Relief Effect of Hard Roof Blasting and Cutting

Analysis of Overburden Structure and Pressure‐Relief Effect of Hard Roof Blasting and Cutting

Field and simulation study of the rational coal pillar width in extra‐thick coal seams

Experimental and numerical investigation on a novel support system for controlling roadway deformation in underground coal mines

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