Study on Blasting Relaxation Test and Stability Influence of Underground Powerhouse Rock Wall Beam

In view of the difficulty in forming the surrounding rock in the rock wall beam area under special geological structures, and the difficulty of assessing the stability of the rock wall beam, a blasting test and sonic test were carried out in the rock wall beam area of an engineering to study the reinforcement measures and stress in the rock beam area. The depth of the relaxation zone was used to modify the results of the stability evaluation of rock wall beams through experimental data modification. The results show that the average depth of the relaxation zone at each measuring point before blasting is 1.73 m, and the average depth of each measuring point after blasting is about 2.51 m. Comparing the results of each test section, the rock wall beam resin anchor pre-reinforcement scheme has a better surrounding rock forming effect. Use the test data to recheck the surrounding rock and structural surface parameters, and modify the numerical simulation calculation results. The safety factor of anti-sliding stability of the rock wall crane beam and the joint surface of the rock wall is 6.89 when the depth of the stress relaxation zone is not considered. When considering the depth of stress relaxation zone, the safety factor is reduced to 3.13, and the rock wall beam is in a stable state. The blasting relaxation test method and stability calculation method of rock wall beam can provide reference for similar projects.