Analysis of the Damping Effect of Rubber Damping Layer under Explosive Load

Abstract

In order to study the influence of the thickness of the rubber damping layer on the damping performance of the rock mass arch structure under explosive load, a finite element model was established based on the ANSYS/LS-DYNA dynamic finite element analysis software, and four rubber damping layers with different thicknesses of 0 m, 0.2 m, 0.4 m and 0.6 m are set between the rock mass and the lining. The fluid-solid coupling algorithm is used to compare and analyze the maximum effective stress, peak pressure and peak displacement of the outer lining dome, spandrel and arch foot elements. Numerical simulation results show that the maximum effective stress of the arch, spandrel and arch foot decreases after setting the vibration damping layer, and the arch foot reduces by more than 80%; with the increase of the thickness of the vibration damping layer, the peak pressure of the vault, spandrel and arch foot decreases, and the peak displacement increases. When the thickness exceeds 0.4 m, the damping and anti-blasting effect is not obvious, and the peak displacement tends to be stable; the vault is a strong response part, and reinforcement measures should be taken; comprehensive consideration of economic factors, it is recommended to set a 0.4 m thick damping layer.