Research On Safety Evaluation System For Demolition Blasting Engineering

Although controlled blasting is widely used in the construction of demolition of buildings for it's safe, rapid and economic characteristics, it's security is relative. Dynamite, detonators and other flammable, explosive dangerous equipment are used in the construction. The construction target are usually located in urban areas, the surrounding environment of which is complex. So the energy released in the blast is likely to cause accident if not controlled well.There are many risk factors in the process of blasting and it's the premise of safety evaluation to analyze them. The paper divides the evaluation system into seven units according to the risk factors and the blasting technology in the process. Choose the safety evaluation method according to the purpose and demand of evaluation. Pre-analysis of danger and fault tree analysis methods are used to evaluate the units, meanwhile, fuzzy math comprehensive evaluation method to the overall system.Using pre-selected risk analysis to divide the evaluation units into different grades: analyze the causing factors, decide the grade and make the corresponding methods. Use event tree method to analyze the accidents in the blast. Get the important coefficient through calculating the smallest cut set and drive set, then find ways that the accidents happen or to be avoided. The writer proposes a safety evaluation method using fuzzy math comprehensive evaluation method that suit the demolition blast system and unifies it with some actual examples. The writer uses AHP to decide the weight of the evaluation factors, which makes it more scientific and reasonable. Choose the superior fuzzy comprehensive operator in the multi-fuzzy comprehensive evaluation foundations. The evaluation system uses multi-fuzzy evaluation techniques to evaluate and determines the membership degree of each factor using scoring method. Then get the safety rating of the project through the fuzzy comprehensive evaluation with the help of the weight of the evaluation factors. The study results of the paper have some practical guide.