Research On The Safety Criterion Of Slope Failure Under The Blasting Vibration

The open pit mine slopes in our country are increasing day by day,and the slope stability problems always exist.The long-term and repeated blasting seismic actions is seriously harm to slope safety.According to the similarity law,a slope model is set up to stope,and the time curve of friction particle velocity under the action of blasting seismic wave collecting blasting earthquake is monitored,and the expressions of the physical quantities of the relevant blocks are determined.The limit equilibrium state of the friction block under the blasting earthquake is established by the sliding condition of the friction block.The pseudo-static coefficient k of the earthquake is calculated to be 2.2625.The safety factor of the friction block at different angles under the action of blasting earthquake is calculated and compared with the safety factor under natural conditions,the safety factor is reduced by 50.47%,50.112%,44.7% and 43.32% respectively,and the allowable ranges of accelerations and velocities at different slope angles are calculated respectively for the blasting earthquake.The safety and stability coefficients of slopes with different internal friction angles under blasting earthquake are calculated respectively.It shows that the safety factor decreases and linearly with the decrease of internal friction angle.The wavelet theory is used to decompose the collected vibration wave to denoise the vibration signal.After processing,the signal is smoother than the original signal,and the information content carried by the original vibration signal is not reduced to a minimum.The wavelet package theory is used to analyze the vibration Signal decomposition and extraction of energy bands carried in different frequency conditions,after comparison it find that the same fiery heart rate at different angles and different fiery from the same angle under the same angle of energy distribution characteristics,as well as the overall energy distribution.Using GDEM BLOCK Dyna software to simulate the real slope under blasting earthquake under self-weight,the slide of the slope is shown as a sliding block.Using LS-DYNA and Workbench software,the stability of the slider and a certain angle of different speeds,a certain speed of the slider under different angles of stability and sliding conditions,basically consistent with the field test.