RESEARCH ON ANCHORAGE EFFECTS OF FULLY CEMENT-IMBEDDED OUTSIDE-CONNECTED ROCK BOLTS AND ELASTIC-CONNECTED ROCK BOLTS IN ANTI-EXPLOSION REINFORCEMENT MODEL TEST
Abstract：Based on anti-explosion reinforcement model test device，the different anchored effects on the tunnel，which is reinforced by fully cement-imbedded outside-connected rock bolts and elastic-connected rock bolts are studied under explosive stress waves produced by plane charging. It is proven that testing instruments are affected by pressure time-dependent curves of free field. For the purpose of the comparison of anchorage effects of two kinds of rock bolts，the differences of arch vault displacement of two underground openings，the surface strain of two underground openings，and the acceleration of roof，floor and ribs of two underground openings are all analyzed. The results show that the arch vault displacement of the tunnel reinforced by fully cement-imbedded outside-connected rock bolts is reduced more significantly than that of the elastic-connected rock bolts compared with that of tunnel without support system. Surface strains of three underground openings are pressed under plane explosive stress waves；and the largest value is found on arch foot. It is also shown that the maximal acceleration is located on the roof；and the accelerations of floors of two underground openings reinforced are increased under the condition of small deformation by adopting some vibration-absorptive ways. Compared with the maximal surface strain and acceleration of two underground openings reinforced，those of the tunnels reinforced by fully cement-imbedded outside-connected rock bolts are relatively small，indicating that the fully cement-imbedded outside-connected rock bolts should be more suitable for the surrounding rock of underground openings than the elastic-connected rock bolts.
