Control mechanisms and design for a 'coal-backfill-gangue' support system for coal mine gob-side entry retaining

Ning, Jianguo; Liu, X.S.; Tan, Jie; Gu, Qingheng; Tan, Yunliang; Wang, J.

doi:10.1504/ijogct.2018.10014371

Cited by 3 publications

(2 citation statements)

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“…In contrast, the mining technology of gob-side entry retaining without coal pillars by roof cutting and pressure relief is a revolution of mining technology [6], which not only realizes the purpose of retaining no coal pillars but also blocks the stress transmission path between the gob roof and the roadway roof by roof cutting and pressure relief [7] so that the gob roof collapses itself to form a roadway by roof cutting. The stability of the surrounding rock in a roadway self-formed by roof cutting are affected by many factors, including roof and floor lithology of the working face [8], blasting-aided roof cutting parameters [9], and supporting parameters beside the roadway [10]. With the rapid development of high-strength anchor bolt supporting materials in recent years, the gob-side entry retaining technology that performs supporting by anchor bolts as the main materials has achieved a favorable application effect [11], the surrounding rock control technology of gob-side entry retaining without coal pillars has been greatly improved.…”

Section: Introductionmentioning

confidence: 99%

Study on Stress Characteristics and Supporting Countermeasures of Surrounding Rock in Roadway Formed by Composite Roof Cutting in Three-soft Coal Seam

2023

AJAGE

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To effectively improve the stability of the surrounding rock in the roadway formed by composite roof cutting of a three-soft (soft roof, coal, and floor) coal seam, the force deformation characteristics of a roadway self-formed by roof cutting were analyzed through similarity simulation, numerical simulation, and field measurement under the engineering background of return air groove on 12406 working face in Selian No.2 Mine. The results showed that a significant pressure relief effect was achieved when the advanced supporting pressure periodicly moved forward to the presplit and cut roof, the stress concentration coefficient on the entity coal side was reduced by about 0.5, and the surrounding rock stress in the roadway was effectively improved. The surrounding rock deformation and the supporting force presented asymmetric distribution characteristics, the deformation rate exhibited a three-section law, and the stress in the gob displayed the recovery characteristic of circular progressive increase from the perimeter to the center. Considering the spatial geological conditions of this mine, a collaborative and integrated surrounding rock supporting countermeasure with "NPR constant-resistance anchor + hollow grouting anchor + retractable U-steel + floor bolting and grouting +door-like scaffold" as the core supporting structure was proposed. The results of the test section manifested that the surrounding rock deformation in the roadway was significantly educed compared with the original supporting scheme.

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Section: Introductionmentioning

confidence: 99%

Study on Stress Characteristics and Supporting Countermeasures of Surrounding Rock in Roadway Formed by Composite Roof Cutting in Three-soft Coal Seam

2023

AJAGE

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“…A number of field cases show that the deformation of retained coal ribs is one of main causes behind the rib-to-rib convergence. During this process, the retained rib with loose and fragmented coal becomes the weakest segment of the roadway with a limited bearing capacity [6][7][8][9], which often undergoes severe deformations, and may even affect the stability of the entire roadway [10,11].…”

Section: Introductionmentioning

confidence: 99%

A Dynamic Numerical Simulation on the Grouting Timing in Retained Rib of Pillarless Mining

Yu,

Xie,

et al. 2023

Applied Sciences

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A dynamic numerical method is established to simulate the stability of the surrounding rocks of the retained roadway in FLAC3D, along with a double-yield constitutive model to simulate the re-compaction process of gangue and a strain-softening constitutive model to simulate the strain-softening characteristic of the coal and the grouted fragmented coal after yielding. The simulation reveals that the grouting slurry diffusion range, the mining affecting the stage behind the working face and the retained coal rib deformation are closely interrelated. Under severe mining-induced stress, the integrity of the surrounding rock is more likely to be destroyed, accompanied by a large number of cracks developing and gradually expanding in the surrounding rocks. The roadway deformation increases in a rapid manner. Meanwhile, the grouting diffusing range increases gradually. The simulation conducted in this study indicates that the optimum support effect can be achieved by grouting in the section before and after the working face affected by the high mining-induced stress. A timely grouting can be used to construct an enhanced surrounding rock-bolting-grouting support system and maintain the stability of the retained roadway.

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Failure analysis and control mechanism of gob-side entry retention with a 1.7-m flexible-formwork concrete wall: A case study

Xie

Wang

Chen

et al. 2020

Engineering Failure Analysis

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Control mechanisms and design for a 'coal-backfill-gangue' support system for coal mine gob-side entry retaining

Cited by 3 publications

References 0 publications

Study on Stress Characteristics and Supporting Countermeasures of Surrounding Rock in Roadway Formed by Composite Roof Cutting in Three-soft Coal Seam

Study on Stress Characteristics and Supporting Countermeasures of Surrounding Rock in Roadway Formed by Composite Roof Cutting in Three-soft Coal Seam

A Dynamic Numerical Simulation on the Grouting Timing in Retained Rib of Pillarless Mining

Failure analysis and control mechanism of gob-side entry retention with a 1.7-m flexible-formwork concrete wall: A case study

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