On The Study Of Blasting Vibration Mechanism And The Control Of Blasting Vibration Effects

Blasting plays a very important role in the construction projects such as mining, construction, hydroelectricity and transportation for the huge amount of excavation of soil and rock. Unfortunately, there is blasting vibration destruction in the process of blasting, which can cause the destruction of buildings, foundations, slopes and tunnels as well as the harm to people' s psychology. Therefore, this thesis makes deep research into the blasting vibration mechanism and the control of blasting vibration effects.This thesis, by elaborating and evaluating the four theories of rock blasting fragmentation mechanism, points out their applicability and explains the engendering mechanism, types and features of blasting earthquake wave. Through applying elasticity theory, the author deduces and solves the blasting earthquake wave equation. Then the author analyses the blasting earthquake wave' s superimposition and its reflection and refraction in the interface with fillings.Based on the case study of pile-well foundation excavation of Yangguang Lijing Building in Qinzhou, Guangxi, the author, with the help of the large-scale finite element software— ANSYS9. 0, gives numerical simulations for blasting vibration and predicts the rule of rock particles vibration speed changing with time and the maximum of vibration speed. According to the results and the facts of ground constructions, the author designs the blasting plan of this project. Taking the design and measured data of foundation excavation project of Yangguang Xincheng in Nanning, Guangxi as the sample and the grey correlation analysis methods, the author works out the primary and secondary order of factors...