Study On The Influence Of Deep Foundation Pit Blasting On The Surrounding Buildings In Complex Environment And The Safety Control

LuXi County Hospital of traditional Chinese Medicine newly built the project of deep foundation pit blasting engineering, there is a complex surrounding environment,and time schedule is pressing, the blasting hazards should be strictly controlled. In this paper, the combination of theoretical research, field testing,simulation aided methods are adopted. Blasting technology of deep excavation in urban area, attenuation law of vibration, the effects of blasting vibration to buildings and security controls were analyzed,there is the specific study below:The similar experience is refered and combined with the actual situation,DTH step-by-hole millisecond and the largest single explosive charge 2.4kg blasting program is proposed. Measured blasting vibration data is regression calculated then obtained the seismic wave propagation under this engineering geological conditions’law:v=109〔3(?)/R〕1.5On the source of the explosion to the speed and direction of building energy attenuation law, analyzing the energy relationship between the different position of the point; start using the HHT method to analyze the velocity of each size band from the energy point of view, while the direction of vibration of the protected position three-dimensional energy spectrum signal, the instantaneous energy spectrum and marginal spectrum and the marginal energy spectrum are analyzed.Using the analysis of dynamic finite element,9 meters from the pit at the six-building model to analyze the stress floors of a building, velocity, displacement size changes; and blasting agent amount geometric analog amplification, inferred in the foundation pit the largest single blasting sound medicine value.Gray correlation analysis on the impact of blasting vibration effect factors are calculated importance selected 9 samples for the analysis of vibration data set,obtained the order of importance of the impact of blasting vibration effect factors put forward five corresponding safety control measures by analyzing effectively reduce the harm of blasting vibration.This studies of this paper have a certain theoretical significance and practical value on the impact level of urban excavation blasting and security control of the surrounding buildings.