Numerical Simulation Of Bolt Load Transfer And Failure Evolution Influenced By Dynamic Load

Dynamic disaster in coal mine is one of the main causes of roadway surrounding rock and anchorage system instability,but many of the current research is done in the static condition,research on the load disturbance under less dynamic.This paper uses the theoretical analysis on the effect of static load drawing of single bolt force distribution is analyzed by numerical simulation of FLAC3 D dynamic load disturbance of a single anchor,anchor group and surrounding rock roadway load transfer and failure law was studied.The results showed that(1)in parallel to the loading end anchor rod under stress wave action,the anchor end of first breaks,damage range gradually expands to the pull end anchor in vertical side loading;In the rod body under stress wave,rock first produced plastic failure,then near the loading side of the anchoring agent of plastic deformation,weaken the overall anchoring effect.(2)from the floor of the roadway surrounding rock under shear stress wave disturbance after the roadway roof surrounding rock horizontal stress peak increases and the peak value is far away from the roof before disturbance;roof subsidence with mining depth is proportional to the relationship.(3)from the bottom shear stress wave disturbance,axial force of anchor bolt group showed a growth trend,the central position of roof bolt axial force increased from 125.83 kN to 102.05 kN,the central position of the axial force of the anchor plate from 109.67 kN to 132.92 kN,the axial force of anchor bolt is increased from 71.06 kN to 103.04 kN at the bottom corner,and the influence of the bolt is weakened with the increase of the distance of the disturbance source.