Deformation mechanism and repairing technology for coal-rock uphill roadway under influence of dynamic pressure

doi:10.16265/j.cnki.issn1003-3033.2020.03.011

Abstract

Abstract: In order to solve difficulty of surrounding rock control under influence of dynamic pressure, with uphill coal transportation roadway of a mine in Guizhou province as engineering background, main features of surrounding rock deformation of such kind of roadway were clarified through field investigation. Then, spatial and temporal distribution characteristics of plastic zone, stress field and displacement field were obtained by numerical simulation analysis, and condition for shear-slip-fault occurrence of coal-rock interface was analyzed theoretically. Then, through analysis on action principle of overlap arch bearing structure, it was found that failure mechanism of original "bolt + mesh + shotcrete + anchor cable" support was disappearance of main compression arch and effect limitation of subordinate compression arch. Finally, repairing principle and a scheme were put forward with the core of collaborative control of"grouting after covering U-steel shed + asymmetric and inclined cross-layer locking clamp cables". The practice shows that serious asymmetric deformation of surrounding rock can be effectively controlled with the proposed scheme.

Key words: repeated mining, coal-rock roadway, coal-rock interface, grouting after covering U-steel shed, cable for locking shed

CLC Number:

X936

GAO Lin, WANG Jiachen, KONG Dezhong, WU Guiyi, MA Zhenqian. Deformation mechanism and repairing technology for coal-rock uphill roadway under influence of dynamic pressure[J]. China Safety Science Journal, 2020, 30(3): 67-73.

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