Research On The Deep Hole Bench Blasting Vibration Effect On Rock Slope Stability

Blasting vibration effect is likely to induce some geological hazards lead to seriousconsequences, such as slope collapse, landslides, debris flow, etc. But the current research onhigh slope dynamic response rule is less in domestic and international. Therefore, it isimportant practical significance that research on the dynamic responses of high rock slopeunder explosion load regularity and explore the influence of blasting vibration to slopestability.Based on the process of a hydropower station construction, analyzed the influence of theblasting excavation to existing slope stability. Main work content is as follows:(1) This paper start with the rock fragmentation mechanism by blasting, the generation ofseismic wave propagation law and mechanism, thus realized the blasting energydistribution and attenuation in the transmission process on the basis of analyzing theblasting seismic wave and earthquake damage mechanism.(2) Summarizes several methods for analyze main factors of affecting the vibrationintensity. Such as the size coefficient method, analytic hierarchy process (AHP),regression analysis, grey correlation method and so on. Grey correlation method is themost reasonable method to analyze the influence factor of blasting vibrationprogression and conclude the main factors affecting, then provide a theoretical basis tofurther study the blasting vibration control parameters and measures.(3) Choose the size of the typical model combine with the engineering geology inhydropower station, Use the safety factor is1.1875with the MEDIAS/GTS analysissoftware under the condition of two-dimensional slope stability analysis. Through theanalysis of the stress and displacement distribution cloud image, the current overallsituation of slope calculation basic conforms to the actual situation.(4) MEDIAS/GTS software is used to analyze the slope of the numerical simulationanalysis under the action of the blasting dynamic load, then contrast with thetwo-dimensional simulation results, the slope safety coefficient is smaller, and the slope displacement on the surface is small, that the blasting effect have a certaininfluence on the stability of the slope, but the slope is stable and consistent with theactual situation. At the measuring point, the simulation results close to the measuredvibration velocity and error are small, it shows that numerical simulation is right andhas certain reference value.(5) By analyzing the basic principle of blasting vibration, the pre-splitting blasting methodwas proposed to reduce vibration, achieved well shock absorption effect.