Study On The Influence Of Adjacent Landform On Blasting Vibration Wave Propagation

Blasting vibration is affected by many factors,such as rock properties and charging methods,etc.However,in the terrain with large undulation,topography and landform have a greater impact on blasting vibration propagation.At present,the research on the impact of landform on blasting vibration wave propagation mainly focuses on a single landform.However,in engineering practice,adjacent landforms are also very common,and there are few studies on the influence of adjacent landforms on blasting vibration wave propagation.Therefore,it is of great significance and practical value to study the influence of adjacent terrain on the propagation of blasting vibration wave to explore the attenuation law of blasting vibration,predict and control the blasting vibration effect.The wave theory is used to analyze the influence of single landform on blasting vibration wave propagation law.At the same time,combining with the propagation characteristics of seismic wave in adjacent landform,the main influencing factors of adjacent landform on blasting vibration wave propagation are analyzed and determined: the depth of concave landform,the height of convex landform,the adjacent distance and the distance of blasting source.Through to the Guang Dong Lu Feng plant blasting vibration field data were analyzed,and the adjacent landform features: the propagating process of blasting vibration wave of blasting vibration wave through the concave and convex concave in shape landforms landscape to horizontal and vertical vibration velocity peak decreases,which level to reduce the size of the larger,blasting vibration attenuation coefficient decreased with increasing of from an explosive source;When the blasting vibration wave passes through the convex landform in the concave-convex landform,both the horizontal and vertical vibration velocity peaks on the top of the convex landform are amplified,and the amplitude of vertical amplification is larger.Both horizontal and vertical amplification coefficients decrease with the increase of detonation source distance.When the blasting vibration wave passes through the convex and concave landforms,both horizontal and vertical blasting vibration velocities are amplified.When passing a concave landform,the horizontal vibration velocity attenuates and the vertical vibration velocity magnifies at both ends of the concave landform.According to the mechanical properties of rock and related blasting parameters in the engineering site,the propagation characteristics of blasting vibration wave in adjacent terrain are simulated by ANSYS/LS-DYNA finite element program.The simulation results show that:In the concave-convex landform,the vibration velocity at the top of the convex landform decreases with the increase of the depth of the concave landform,increases with the increase of the height of the convex landform,and decreases with the increase of the distance between the concave landform and the convex landform.The attenuation coefficient of concave landform and the amplification coefficient of convex landform decrease with the increase of detonation source distance.The simulation results of convex and concave landforms show that: in the convex and concave landforms,the attenuation law of blasting vibration presents an "M-like curve" on the whole,and the horizontal and vertical "M-like curve" are different.With the increase of the depth of concave landform,the peak vibration velocity at the top of convex landform and at the side of the blast source of concave landform both increase.With the increase of the height of convex landform,the peak vibration velocity of convex landform top,concave landform near the explosion source side and the back of the explosion source side increase.However,with the increase of adjacent distance and detonation source distance,the peak vibration velocity of the top of convex landform and the concave landform on the side of the detonation source and the back of the detonation source decreases.Through the actual vibration monitoring research conclusion promotion to the engineering application,think in the concave and convex shape landforms,blasting vibration monitoring should not only consider the source distance,also should consider the elevation amplification effect of blasting vibration,and according to the laws of the adjacent terrain effect on blasting vibration propagation,concave and convex shape features is given with convex-concave geomorphic damping ditch layout dangerous working condition and working condition of the standard.