Large Deformation Mechanism and Three-Level Control Technology of Entry Retaining in Three-Soft Thick Coal Seams

Ma, Zimin; Guo, Zhibiao; Wang, Haohao; Hu, Jinzhu; Li, Tao; Jing, Chen

doi:10.1007/s10706-020-01419-x

Cited by 4 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the reinforcement scheme of Zhao Gu I mine and improved by a field test [39,40], the mine site adopted the scheme of grouting-anchor-cable reinforcement. On the basis of the original support, the φ22 × 8250 mm grouting-anchor cable was used in the roadway roof, and three and four were staggered.…”

Section: Field Testmentioning

confidence: 99%

Mechanism and Control of Asymmetric Floor Heave in Deep Roadway Disturbed by Roof Fracture

Wei

Zhang

et al. 2023

Sustainability

View full text Add to dashboard Cite

In view of the serious problem of bottom-drum damage in deep mining along empty roadways, the asymmetric bottom-drum damage characteristics and control mechanisms of deep mining along an empty roadway were studied using the trackway of the 11060 working face in Zhao Gu II mine as the research background. Based on the slip-line theory, support-pressure distribution law, and Griffith’s damage-criterion theory, the mechanism of asymmetric bottom drums and the maximum fracture-development depth of the bottom plate in a deep roadway under top-plate fracture perturbation were analyzed. The 3DEC discrete-element software was used to simulate and analyze the characteristics and evolution of the asymmetric bottom bulge of the roadway under dynamic-load disturbance, and the asymmetric control scheme of “slurry anchor reinforcement + top cutting and pressure relief” was proposed. The results show that, under the influence of static load of deep high-abutment pressure and the dynamic-load impact of the instability of the masonry-beam structure under periodic pressure of the adjacent working face, the deep-mining goaf roadway was prone to producing asymmetric floor heave. The floor-heave degree and maximum fracture-development range of the roadway in the affected area under the influence of dynamic load > those in goaf roadway > those in the roadway in the stable area affected by tunneling. The distribution of stress, displacement, and maximum floor heave was skewed to the side of the coal pillar in the goaf, showing an inverted right oblique V shape. The asymmetric floor heave of a roadway can be effectively controlled by grouting anchor-cable reinforcement (increasing the anti-damage limit) and roof-cutting pressure relief (cutting off the dynamic-load source). The research results can provide an important reference for the control of roadway floors under similar geological conditions.

show abstract

Section: Field Testmentioning

confidence: 99%

Mechanism and Control of Asymmetric Floor Heave in Deep Roadway Disturbed by Roof Fracture

Wei

Zhang

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…The adaptability of the original technical scheme can be limited due to changes in geological conditions 42 . Therefore, the application and popularization of GERRC are particularly important under soft strata 43 …”

Section: Introductionmentioning

confidence: 99%

“…42 Therefore, the application and popularization of GERRC are particularly important under soft strata. 43 In addition, an insufficient bearing capacity and easily crushed sidewall are geological characteristics of soft strata, and examples of roadway deformation caused by sidewall crushing are not uncommon. 44 In this regard, Zhu et al 45,46 believed that the main reason for the collapse of the sidewall is that the bolt is in the broken surrounding rock and cannot fully achieve its support potential, and they proposed a support scheme.…”

Section: Introductionmentioning

confidence: 99%

Research on gob‐side entry‐retaining technology with coal rib and corner strengthened support in soft rock strata

Zhu

Lou

et al. 2023

Energy Science & Engineering

View full text Add to dashboard Cite

The gob‐side entry‐retaining by roof cutting and pressure relief (GERRC) method is an advanced no‐pillar mining method that can significantly improve coal recovery and reduce roadway accidents. However, according to case studies, there is relatively little research on the application of the GERRC method in geological conditions of soft rock formations (especially when the roof and floor are both mudstone), and such research is needed. Therefore, based on the typical soft strata of the Xinyi Coal Mine, this paper analyzes the failure mechanism of the roadways and proposes the GERRC method with coal rib and corner strengthened support (CRCSS). The evaluation indexes of the roof convergence rate and cable safety margin are established, and the effects of roof cutting and CRCSS on roadway deformation control are explored by a numerical comparison test. The results show that roof cutting has a limited effect on roadway deformation. The deformation can be reduced by 75.77% by implementing CRCSS on the basis of GERRC. Then, the evolution characteristics of roadway stress and deformation in the process of mining are further discussed through field contrast tests. The field application results show that compared with that of GERRC with conventional support, the surrounding rock deformation of GERRC with CRCSS is reduced by more than 55%, the safety margin of the cable is improved. The overpressure of the hydraulic prop is diminished, and the stability distance of the roadway is reduced by approximately 30%. Finally, this paper discusses the mechanism to control roadway deformation by CRCSS. This research expounds the rationality of CRCSS, and the results can provide a reference for other situations with similar geological conditions.

show abstract

“…The objective of this study is to investigate the protective role of coal gangue waste on the rock strata above the goaf and the retained roadway during underground backfilling mining. The research employs theoretical calculation and numerical simulation techniques to examine the factors that influence surface subsidence, the migration behavior of overburden rock, and the deformation characteristics of retained roadways in fill mining [ 31 ]. The theoretical calculation confirms the significant impact of the filling rate on controlling roof subsidence.…”

Section: Introductionmentioning

confidence: 99%

Solid waste filling and roadway retaining for longwall mining by numerical investigation

Sun,

Huo,

et al. 2023

Heliyon

View full text Add to dashboard Cite

Large Deformation Mechanism and Three-Level Control Technology of Entry Retaining in Three-Soft Thick Coal Seams

Cited by 4 publications

References 14 publications

Mechanism and Control of Asymmetric Floor Heave in Deep Roadway Disturbed by Roof Fracture

Mechanism and Control of Asymmetric Floor Heave in Deep Roadway Disturbed by Roof Fracture

Research on gob‐side entry‐retaining technology with coal rib and corner strengthened support in soft rock strata

Solid waste filling and roadway retaining for longwall mining by numerical investigation

Contact Info

Product

Resources

About