DOI: 10.11799/ce202602009
Instability mechanism and control techniques of coal-rock roadway sidewalls in gob-side entry retaining in deep inclined coal seams
LIANG Maoliang
SUN Jinbing
REN Zebin
LI Tingchun
ZHU Qingwen
LI Jiapeng
Abstract：To address the instability and failure of coal-rock roadway ribs in deep inclined coal seams under high stress and mining disturbance,we take the gob-side entry retaining of the 2301 working face in Zhangji Coal Mine as the engineering background.Using theoretical analysis,numerical simulation,and field tests,the deformation and failure mechanism of the surrounding rock in coal-rock roadways is systematically investigated,and a cooperative control scheme of"roof cutting pressure relief+cross-layer surface strengthening support"is proposed.The results show that compression-shear failure within the coal mass and shear slip at the coal-rock interface are the main causes of roadway side deformation and instability.Effective measures for stabilizing the coal-rock roadway side include reducing rib loading and restraining interfacial slippage.The maximum additional compressive strength provided by bolts(cables)occurs when the angle between interface/cross-layer bolts(β)equals the interface friction angle(φs).Numerical simulations demonstrate that under the pressure relief-reinforcement system,coal mass deformation decreases by 26.1%and relative deformation between coal and rock reduces by 47.8%.Field monitoring verifies that this control scheme achieves 34.9%reduction in coal-rock roadway convergence,effectively restraining rib deformation in mining roadways.
Keywords：inclined coal seamcoal-rock roadwaycoal-rock interfacesupport technologyinstability mechanismroof cutting pressure relief
Publication Date：2026-02-20
Online Publishing Date：2026-03-23(First online date of this platform, not the publication date of the document)
Pages：9( 70-78 )