Abstract:

Based on anti-explosion model test, the explosion resisting performance of the tunnel which is reinforced by fully bonded rock bolts is studied under explosive stress waves produced by plane charging. The results show that test data are reliable by analyzing pressure temporal curves of free field; vault displacement of the anchored tunnel is reduced significantly; and the tunnels are damaged when the scale distance is 5.23 cm/g1/2; the surface strains of two tunnels are pressed under plane explosive stress waves，the most of which is on arch foot; with the reducing scale distance, the peak strains increase firstly; and then reduce, the maximal peak strains increase; the acceleration of roof is maximal, which is relatively reduced when anchored; and the acceleration of floor of the anchored tunnel is increased under the condition of small deformation which should be reduced as necessary by adopting some vibration-absorptive ways; the more the tunnel damages severally, the more the acceleration of ribs of the anchored tunnel reduce significantly, with the reducing scale distance, the acceleration of roof and ribs grow, especially when the scale distance is 5.23 cm/g1/2.

Key words: fully bonded rock bolts, explosion resisting performance, model test, explosive loads