| This article take the Shanxi province Xin zhou County elm slope mine inclined shaft excavation blasting vibration effects of the ground as the object of study. In this paper the monitoring content and principle of blasting vibration, blasting vibration effect of blasting seismic wave control and frequency domain characteristic theory in detail. According to the county sewage treatment plant built (structure) to build on the test requirement and content, detailed test plan formulation process and the selected test instrument features, and with a large number of test data analysis author draws the following conclusions:(1) Inclined shaft excavation blasting, different types of hole of the free surface condition on surface vibration impact, from the measured blasting seismic wave, forward cut hole blasting seismic effect caused by the most intense, the surface vibration velocity amplitude are other types of blasting with more than2times.(2) The data analysis, the slope excavation blasting on ground vibration effect is divided into three regions:blasting forward influence zone, blasting face above the impact zone, blasting hole impact zone. Blasting excavation will be a moving shock wave, the effect of shock wave, blasting vibration data would be greater than the face just above the vibration monitoring data, who’s main cutting angle, charge and buried depth and other factors, the maximum value of blasting vibration in front of face10m. Because the cavity effect, ground vibration maximum located in the face before10m. The monitoring effects of maximum area (before or after the tunnel excavating face) velocity, so as to understand the whole region of the maximum vibration velocity value. It would be more efficient, more accurate grasp of inclined shaft excavation blasting influence on surrounding environment, focus on regional grasp the forward direction.(3) The use of SA sadowsky empirical formula for three blasting influence area of blasting vibration velocity of linear regression and found, blasting forward influence area and the void region attenuation parameters do not correspond to" blasting safety regulations" provisions in the, unable to establish a reasonable physical model. While the face above the impact zone of blasting attenuation parameters meet the" blasting safety regulations" provisions, the attenuation law:Among them, the attenuation parameter K=135.7, a=1.35, and the establishment of physical model. Through the model, blasting seismic wave attenuation formula can predict the blasting seismic wave vibration speed, as the whole blasting engineering safety and smooth sewage treatment plant safety to provide technical basis.(4) On blasting vibration wave of the main vibration frequency is analyzed in this paper, the blasting seismic waves generated by the main frequency in the40-70Hz, far greater than the surface construction (structure) of natural frequency is4～10Hz, therefore, the two will not have a resonance phenomenon, the sewage treatment plant built (structure do not destroy). From the distance of blasting and blasting vibration frequency diagram can be drawn, with the blasting distance increases, the frequency of basically decreased.(5) For the inclined shaft excavation blasting vibration control, puts forward the control slot hole blasting of single charge, and for the eyes, eye of periphery holes and bottom single charge is completely can be larger than the cut holes the single charge.(6) Adjusting the blasting parameters, change the blast holes arrangement can reduce the blasting vibration of inclined shaft excavation blasting.(7) The elm slope mine inclined shaft excavation blasting safety through a sewage treatment plant proves that the blasting vibration monitoring whole is the key to the success of this project. |
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