Study on the interaction relationship between surrounding rock and support considering axial stress
Based on the elastoplastic theory,the approximate solution for the plastic zone of the sur-rounding rock under the three-dimensional stress field considering the roadway support resistance is de-rived.Based on the engineering background of 160206 return airway in Yangchangwan Coal Mine,the influence of support resistance on the plastic zone size of roadway surrounding rock is studied by theore-tical analysis and numerical simulation.The research shows that in cases where the shape of the sur-rounding rock's plastic zone resembles a"butterfly"or"oval",the improvement of support resistance significantly contributes to controlling the plastic zone.However,in instances where the surrounding rock's plastic zone appears"butterfly"shaped,the efficacy of improving support resistance on rock con-trol is restricted.The main function of bolt and cable support is to suspend the upper broken rock strata in the stable rock strata and control the discontinuous deformation of surrounding rock.Strategies for main-taining the stability of roadways impacted by superimposed mining primarily involve adjusting the stress conditions of the surrounding rock,modifying support structures,and implementing key support in but-terfly-sensitive areas.Based on this control concept,a strengthened support scheme is provided for the superimposed mining-affected area of 160206 return air roadway,and the stability of roadway surround-ing rock is significantly improved.
surrounding rock controlplastic zone solutionbutterfly plastic zoneroadway roof fallsupport resistance
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