Physical Similarity Simulation of Deformation and Failure Characteristics of Coal-Rock Rise under the Influence of Repeated Mining in Close Distance Coal Seams

Pengze Liu, Lin Gao, Pandong Zhang, Guiyi Wu, Yongyin Wang, Ping Liu, Xiangtao Kang, Zhenqian Ma, Dezhong Kong and Sen Han
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Pengze Liu: College of Mining, Guizhou University, Guiyang 550025, China
Lin Gao: College of Mining, Guizhou University, Guiyang 550025, China
Pandong Zhang: College of Mining, Guizhou University, Guiyang 550025, China
Guiyi Wu: College of Mining, Guizhou University, Guiyang 550025, China
Yongyin Wang: College of Mining, Guizhou University, Guiyang 550025, China
Ping Liu: College of Mining, Guizhou University, Guiyang 550025, China
Xiangtao Kang: College of Mining, Guizhou University, Guiyang 550025, China
Zhenqian Ma: College of Mining, Guizhou University, Guiyang 550025, China
Dezhong Kong: College of Mining, Guizhou University, Guiyang 550025, China
Sen Han: College of Mining, Guizhou University, Guiyang 550025, China

Energies, 2022, vol. 15, issue 10, 1-13

Abstract: Aiming at the problem that it is difficult to achieve accurate laying of model and precise excavation of roadways in special surrounding rock structure roadway according to conventional physical similarity simulation, which reduces the reliability of experimental results. An accurate laying of model and precise excavation of roadway method, named “labeling positioning and drawing line, presetting roadway model” (LPDLPRM), was proposed. The physical similarity simulation of deformation and failure characteristics of surrounding rock of coal-rock rise, under the influence of repeated mining in close distance coal seams, was carried out based on the method and infrared detection. The results show that the coal-rock rise in close distance coal seams was affected by repeated mining disturbances, and the surrounding rock of coal-rock rise was characterized by obvious asymmetric deformation, specific for the stress and strain near the coal pillar were higher than that of other parts, and cracks near the coal pillar were denser than other parts; when the coal seam is mined in which the coal-rock rise is located, the stress concentration of the surrounding rock near the rise was weakened by mining pressure relief in the upper coal seam; the stress concentration of the surrounding rock near the rise increases when the coal and the lower coal seam are mined, and the stress on the right side (coal pillar side) near the coal-rock rise was the most concentrated. Therefore, it is important to take measures to strengthen support near the coal pillar and to control asymmetric deformation when the coal-rock rise is influenced by repeated mining.

Keywords: similar simulation test; precise excavation of roadway; repeated mining; coal-rock roadway; infrared thermal image (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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