DOI: 10.11799/ce202512006
Surrounding rock deformation characteristics and control technology in deep semi-coal rock gob-side roadways of gently inclined coal seams
LI Zhiyuan
ZHAO Guangming
CHENG Xiang
QING Zhihong
MENG Xiangrui
WANG Yanfen
Abstract：To address the severe surrounding rock deformation and challenging support issues in deep semi-coal rock gob-side roadways of gently inclined coal seams under high in-situ stress conditions,we took the gob-side roadway of Ⅱ7226S working face in Renlou Coal Mine as an engineering case.Methods including theoretical analysis,numerical simulation,and field testing were employed to investigate the deformation and failure patterns of semi-coal rock gob-side roadway surrounding rock under mining influence,analyze the deformation mechanism,and a surrounding rock control scheme was proposed combining high-strength pre-stressed bolt-cable support with grouting modification reinforcement.The results show a negative correlation between roof deflection in the gob-side roadway and the bearing capacity of the coal pillar,so the roof subsidence can be controlled through enhancing the pillar bearing capacity.Under conventional bolt-cable support,significant stress differences exist between the two ribs of the roadway,leading to asymmetric deformation.The coal rib tends to slide and bulge along the coal-rock weak interface,with severe deformation and overall shear failure occurring on the pillar rib.After optimizing the support design and incorporating grouting modification reinforcement,the stress difference between the two ribs is reduced,the surrounding rock stress environment improves,and deformation is significantly reduced.Field verification in the test section confirms satisfactory control of the roadway surrounding rock.
Keywords：semi-coal rock roadwaysurrounding rock deformation characteristicssupport technologygrouting modification reinforcement
Publication Date：2025-12-20
Online Publishing Date：2026-01-29(First online date of this platform, not the publication date of the document)
Pages：10( 39-48 )