Research On Risk Control And Safety Assessment System Of Demolition Blasting

Explosive demolition is widely used to demolish old building in the city area nowadays. The material used in explosive demolition is dynamite and detonator which is dangerous. Furthermore, the building to be demolished is usually in the city area, once the energy that dynamite release loses control accident may happen, explosive demolition is highly hazardous. So now many researchers focused on the safety of explosive demolition. In this paper, the methods that prevent accident are introduced, and base on it safety assessment modeling for explosive demolition is established.In this paper, the hazards not only include adverse effects of blasting that might happened with explode of dynamite; instead, the whole procedure of explosive demolition is analyzed as a system. The whole procedure of explosive demolition is divided into six phases: pre-demolish, drilling, charging, safety defend, firing circuit linking and checking, blasting. Hazards that probably happen in the six phases are distinguished; furthermore the measures to prevent accident are introduced. At the same time, the safety management system is established, and the management system ensures the system to be implemented through four aspects: establishing safety management organization, safety management in the work area, safety inspection, safety education and training.Based on fuzzy transformation, the "average with weight" evaluation method is selected and fuzzy comprehensive evaluation model is established. Through the example of blasting project how to use the model is shown. Based on the result of hazard distinguish, the seven factors that influence safety of blasting were summarized, and twenty-three basic factors were deduced by disassembling the seven factors. A precise and reasonable method—Analytical Hierarchy Process(AHP) is used to calculate the relative weights of safety assessment factors of blasting, which reflect the factor' importance to blasting. Subject function, instead of fuzzy statistics is used to define the factor's subject degree, and the former is more reasonable and scientific. The real safety status of the blasting project is given according to the principle of the biggest subject.