Field and Numerical Investigation on the Coal Pillar Instability of Gob‐Side Entry in Gently Inclined Coal Seam

Ta, Xupeng; Wan, Zhifeng; Zhang, Yuan; Shi, Peng; Wei, Zejie; Sun, Xin; Lu, Jia

doi:10.1155/2021/4901670

Cited by 5 publications

(2 citation statements)

References 16 publications

(16 reference statements)

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“…At present, China has proven to have large reserves of inclined coal seams, which have a very high mining value [4,5]. However, due to the influence of underground inclination and angle, the deformation features of inclined coal seam roadways are more complicated, which brings great difficulties to roadway shoring [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway

Shan

Liu

et al. 2023

Applied Sciences

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In view of the complex asymmetric deformation characteristics of inclined coal seam roadways and the tensed shear failure of anchor cable supports, the asymmetric support scheme of an anchor cable with a C-shaped tube is proposed. In order to study its supporting effect on an inclined coal seam roadway, this paper first explores the difference in shear performance between an anchor cable with a C-shaped tube and an anchor cable through double shear tests. Then, based on the asymmetric deformation characteristics of an inclined coal seam roadway in the Pangpangta Mine, a numerical simulation is used to study the asymmetric support effect of an anchor cable with a C-shaped tube in an inclined coal seam roadway. The results of the double shear test show that the anchor cable with the C-shaped tube has stronger resistance to shear load than that of the anchor cable. Through the results of the numerical simulation, the original stress field distribution on both sides of the roadway was found to be uneven due to the influence of the coal seam dip angle, and after the excavation of the inclined coal seam roadway, the displacement and plastic zone distribution on both sides showed obvious asymmetric characteristics. Compared with the symmetric support, the asymmetric support can obviously alleviate the asymmetric deformation characteristics of the two sides and effectively control the deformation and plastic failure zone of the roadway. The anchor cable with the C-shaped tube has better resistance to shear deformation than that of the anchor cable. The anchor cable with the C-shaped tube can reduce the deformation and plastic area of the roadway more effectively.

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Section: Introductionmentioning

confidence: 99%

Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway

Shan

Liu

et al. 2023

Applied Sciences

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“…Other researchers have studied shield support interaction with the overlying roof strata by performing model tests on various types of shield support which results in different fracture zone under different strength parameters of rock [10]. Others have used numerical simulations to estimate and predict the behavior of surrounding rock in a longwall face, the interaction of roof with powered shield support, stability of the coal pillar, and influence of dynamic pressure in longwall mining with substantial outcomes [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Roof Stability in Longwall Face Developed in Shallow Depth under Weak Geological Conditions

et al. 2022

Self Cite

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Developing longwall mining under weak geological conditions imposes a substantial challenge with regard to the higher risk of falling roofs. Maintaining the stability of the longwall face in this aforementioned condition is crucial for smooth operation. Investigating roof conditions in longwall requires detailed study of rock behavior in response to a few key influences. This paper presents the outcome of a numerical analysis of roof stability in shallow depth longwall face under weak geological conditions. A series of validated FLAC3D models was developed to examine the roof condition of the longwall face under the influence of shield canopy ratio, shield resistance force, and stress ratio. The results show that these three key factors have a significant impact on longwall roof conditions, which can be used to optimize its stability. Two distinct mechanisms of the roof caving behavior can be observed under the influence of stress ratio. The countermeasures of reducing face-to-tip distance and cutting width are proposed to improve the roof condition of longwall face under weak rock. The outcomes show a substantial improvement in roof conditions after adopting the proposed method.

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Support on Deformation Failure of Layered Soft Rock Tunnel Under Asymmetric Stress

Yang¹,

Wei

Zhang

et al. 2022

Rock Mech Rock Eng

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Field and Numerical Investigation on the Coal Pillar Instability of Gob‐Side Entry in Gently Inclined Coal Seam

Cited by 5 publications

References 16 publications

Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway

Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway

Numerical Investigation of Roof Stability in Longwall Face Developed in Shallow Depth under Weak Geological Conditions

Support on Deformation Failure of Layered Soft Rock Tunnel Under Asymmetric Stress

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