Design and mechanical characteristics research of rock burst prevention combined components of the double laminated springs

Abstract

In order to solve the engineering problem that the bolt tail is often broken under the impact of rock pressure, mining stress and the damage to the support structure contribute to great hidden danger to the safety of mining and tunneling. A new anti-impact bolt support structure is designed that can absorb energy under pressure. The double laminated springs and the inner spring deform under the impact load to achieve the purpose of absorbing most of the impact energy. The composition and working principle of the energy-absorbing structure is introduced. The static axial compression tests of the single laminated springs with cone angles of 30°, 45°, and 60° are carried out. The mechanical characteristics of the laminated springs in the three stages of energy absorption are investigated. It is found that the 45° laminated spring has the best energy absorption effect. The simulation method was used to analyze and optimize the energy absorption effect of anti-scour composite components. Double laminated spring anti-shock composite components absorb the impact energy and avoid the damage to the bolt support structure, which reduces the roadway support cost and has important engineering application value for ensuring the safety of deep tunneling and mining.