Research On Key Technologies For Blasting And Demolition Of Special-shaped Structure Buildings In Complex Environment

At present,in the process of China’s rapid urbanization in recent years,a series of problems such as old city transformation,regional replanning,and reconstruction of some buildings have become problems that we have to face to improve the living environment.In China’s urban development,more and more abandoned buildings use the method of blasting and demolition.Since many buildings are located in complex environments and there are many objects to be protected around,there are strict requirements for the harmful effects of blasting when building blasting and demolition.By studying the key technologies and safety protection technologies of blasting and demolition of special-shaped structural buildings in complex environments,this paper provides more effective methods for special-shaped structural buildings in complex environments.In this paper,a comprehensive research method combining theoretical research,numerical simulation analysis and engineering practice is adopted to study the collapse process of special-shaped buildings in complex environments,and the results are as follows:(1)Using ANSYS/LS-DYNA software to establish and calculate the model of the building to be demolished,the whole process of collapse instability of the building to be demolished was analyzed,and it was concluded that reasonable pre-demolition mechanical cutting is necessary for the smooth directional collapse of the specialshaped structure building in complex environment,the control of the collapse direction,and the control of the harmful effect of blasting.(2)Using ANSYS/LS-DYNA software to analyze the numerical simulation of the building,the influence of the height of the blasting incision and the blowing height of the rear support column on the recoil of the building collapse was obtained.(3)In view of the fact that in the building blasting and demolition project,there are fewer safety protection technologies that can effectively reduce the impact of the recoil hazard of building blasting and demolition,a comprehensive protection structure with harmful effects of building blasting and demolition is proposed;Aiming at the harm of building blasting to important protection objects in blasting and demolition,a new blasting safety protection technology combining active protection and passive protection is proposed,which has achieved good results in the project and provided reference significance for similar projects.