The dynamic response characteristics of high and steep slopes under the action of earthquakes and blasting was focused on, especially the frequency distribution and propagation laws, which are crucial for slope stability assessment. Using stress wave theory as the theoretical basis and advanced FLAC3D numerical simulation technology, we systematically analyze the frequency response of slope under different joint conditions under seismic waves. The nonlinear characteristics of reflected P-wave coefficient and the significant sensitivity of joint to incident wave frequency are revealed when the Angle of incident P-wave changes. The results show that with the increase of the incidence Angle of the incident P-wave, the reflection coefficient of the reflected P-wave decreases slowly at first and then increases sharply to 1.0. The reflection coefficient of the wave at the joint is more sensitive to the frequency of the incident wave. In a biplanar rock mass, multiple reflections of waves between structural planes produce transmitted waves with different time differences.

Based on a comprehensive research method combining a field test and numerical simulation, the dynamic response characteristics of a buried corroded gas pipeline under blasting are deeply explored, the numerical model parameters are verified, and the stress distribution of the pipeline is analyzed. It was found that the stress change of the pipeline is significantly affected by the elastic modulus, thickness, and defect length under the same blasting parameters. Increased elastic modulus and thickness can decrease stress, while increasing defect length can increase stress. Therefore, it is suggested that high-elastic-modulus materials should be given priority in pipeline design and material selection, pipeline thickness should be strictly controlled, and regular inspection and maintenance should be carried out. Especially for pipe sections with long defect length, monitoring and maintenance should be strengthened, and safety assessment and protection measures should be formulated before blasting operation to ensure the safe operation of the corrosive gas pipeline under the action of blasting vibration.