Study on deviatoric stress distribution law and failure mechanism of roadway surrounding rock
The distribution characteristics of plastic zone morphology in surrounding rock of mining roadway are the key issue of roadway stability control.Taking 31117 working face of Jinjie Coal Mine as the engineering background,based on the maximum principal deviatoric stress and the butterfly failure theory of roadway,the causes of large deformation and failure in 31117 roadway were revealed.The results showed that under different stress fields,the maximum principal deviatoric stress had three failure modes:circular,elliptical and X-shaped.At the same time,the plastic zone morphology of roadway surrounding rock had a corresponding relationship with the maximum principal deviatoric stress morphology,thereby taking the maximum principal deviatoric stress as an index,the deformation and failure mechanism of roadway surrounding rock could be revealed to a certain extent.Under the action of high deviatoric stress,squeezing damage occurred on both sides of the 31117 roadway roof.Based on the distribution of deviatoric stress,the key control technologies of roadway were put forward.
plastic zone morphologyroadway supportroof damagebutterfly damagedeviatoric stress
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