A New Rock Bolt Pallet and its Dynamic Response Simulation Research
Aiming at the problems such as bending,tearing and support failure of pallets caused by the instantaneous increase of the force between surrounding rock and pallet under the dynamic loading,a new anti-impact large deformation pallet was designed.According to the theory of viscous damping system,the vibration mechanics equation of the new anti-impact large deformation pallet under dynamic loading was established.Dynamic response characteristics of three different types of pallets under different impact energy(2.5 kJ,5.0 kJ,7.5 kJ,10.0 kJ)were compared and analyzed by Abaqus finite element numerical simulation method.The theoretical analysis results show that the new anti-dynamic large deformation pallet has better anti-dynamic loading capability,and with the increase of damping ratio,the anti-dynamic loading capability gradually increases.The simulation results show that under the same dynamic loading,compared with the flat pallet and adjustable arched pallet,the impact force action time of the new anti-impact large deformation pallet is reduced by 39.29％and 53.21％,the residual strain is reduced by 72.35％and 76.60％,and the energy absorption rate is increased by 69.00％and 3.45％,the maximum pallet deformation is increased by 514.5％and 139.5％,respectively,and the anti-dynamic loading capability is greatly improved.The strain of the new anti-impact large deformation pallet under different dynamic loading is small,indicating that the pallet relies mainly on the interaction of internal components to absorb the impact energy,rather than the irreversible deformation of the structure,which can ensure the structural integrity of the tray under dynamic loading.
Dynamic loadingAnti-impact large deformation palletDynamic responseNumerical simulation
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