Tengchong County Area Complex Environment Top Tube Blasting Vibration Safety Research

At present, with the accelerated process of China's urban development, urban areas in the expansion, renovation process, often involving the conversion of sewage pipes. However, due to engineering constraints, a large proportion of these pipes need to use blasting for excavation, and the sewers are generally inevitable cross the city building' (structures) periphery or below, which makes construction more difficult. Blasting induced a series of negative effects especially in the first explosion hazard problems of blasting seismic effect by a universal concern and attention. Therefore, how to predict and control the effects of blasting vibration to protect the building (structures) of the security, has become an important issue to be solved in blasting engineering.This thesis combined《The project of urban sewage treatment plant supporting pipe network(one tenders)——Top tube blasting specialist sub-project in Tengchong》to start the research. From April 2011 to July, which lasted four months of blasting production practices, and whole monitor the need to protect the building (structures) of the blasting vibration.First, inspecting the actual situation of the top tube blasting site of Tengchong Country, to understand the geological terrain and status of surrounding buildings, according to the blasting site geological conditions, construction requirements, the minimum safety of allow velocity of the required to protect the building.blasting program design;and take a different Undercuttingway, detonation mode to do the comparison test, and ultimately determine to take the vertical bucket undercutting as the engineering methods, sub-millisecond delay blasting for construction.Second, according to blasting vibration monitoring data,it has summarized the rule of blasting seismic wave which spread in igneous rock in the Tengchong pipe jacking. In order to further studying of the blasting seismic wave propagation characteristics, we analysed the blasting seismic wave propagation in igneous rock, found out the energy and frequency spectrum rule of blasting seismic wave propagation in igneous rock. According to the HTT method, the studying of blasting seismic wave propagation characteristics is analysed separately from large quantity, total explosive, blasting the heart from three aspects,it will provide the guidance in the blasting parameters optimization and safety construction.Finally, based on ANSYS to establish the calculated model of the nearest construction for the sales department, study the influence of blasting vibration in the case of the building structure was in the largest dose of 0.35kg by the numerical simulation, analysis the variation of the stress, displacement and vibration velocity under the different heights and the different distance of explosion with LS-DYNA。The thesis can provide some theoretical guidance for blasting in the igneous region in Tengchong County。...