Study On The Main Factors Of Blasting Vibration Damage And Safety Evaluation Method

Blasting vibration is the inevitably affect in the process of blasting production in mines, with the extensive use of blasting and blasting technology, continuous expansion of the scale of blasting vibration control of hazards put forward higher requirement. Therefore, a reasonable selection of parameters of blasting vibration and prediction blasting vibration attenuation law is to be effectively controlled blasting vibration against the foundation and prerequisite.The expression of blasting vibration physical intensity mainly included displacement of mass point, velocity, acceleration and vibration frequency. Because of the mass point vibration can be easily measured to the others, and can be used to describe the blasting vibration intensity, so take the mass point vibration velocity to represent the intensity of blasting vibration has been generally used.There are complex nonlinear relationships between blasting parameters in processing of propagation of blasting seismic wave in layer medium, peak velocity of blasting vibration is an important basis for the safety evaluation of blasting, the particle velocity of blasting vibration in three directing vector and the particle vibration velocity of three vector synthesis has got more and more attention in the evaluation practice of blasting safety. Based on the analysis of M.A. SA. Tao Minkowski formula, a linear model is established for a multi direction of attenuation of blasting vibrate velocity, combined with the examples of mine blasting, get the three direction site coefficient K and seismic wave attenuation index ? of the two unknown parameters of the mass point by using the least square principle. Achieved the vibration attenuation formula of there direction, combined with synthesis vector of blasting vibration velocity, reflecting the attenuation of particle velocity in different directions.With the development of in-depth research of the blasting vibration effect and new measurement instrument, the influence of blasting vibration frequency has became a important factor to evaluate the blasting vibration effective. The main blasting vibration frequency is the very important affecting of factors causing by blasting, for different types of buildings there have different range of blasting vibration frequency control rate. Therefore to predict the blasting vibration frequency in blasting is of great realistic significance.Because of the influence blasting vibration is very complex, so we build the relationship between charge and the distance which are the two main blasting parameters and the main frequency of blasting vibration by using the principle of the dimensional analysis method, and get the blasting vibration frequency prediction formula of certain geological conditions by using the method of regression analysis, so that have a practical significance to control the influence of blasting vibration frequency.