Study On Resist Blasting Performance Of The Shallow Buried Underground Protective Structures

In order to adapt to the requirement of the present war, some military research department has developed a sort of advanced fabricated protective structure, which adopts a new type of composite material that steel plate-steel skeleton-polyurethane foam sandwich plates as its base components, and so the protective structure has some merits such as light weight, high intensity, quickly construction, freeze resistance and heat preservation. But, some problems, such as the characteristic of dynamic load distributing on the protective structures, the deformation rule of the structures in the impact of the blasting load, how to strengthen their performance of resist blasting after the structures are shallow buried, are still in study and exploratory at the present time.Based on the chemical blast site test of fabricated protective structures, the behavior of dynamic load distributing on the upper surface of the protective components and the their corresponding deformation law after blasting load pass through the earth cover are analyzed. Adopting the method that steel plate-steel skeleton-polyurethane foam sandwich plates used as energy-dissipating layers above the underground structures, the thesis analyses the function of the energy-dissipating layers in the earth cover and brings forward the possible approach to how to strengthen their performance of resisting blasting load or the interrelated development direction.To assess correctly the resist blasting performance of the fabricated protective structures and the acting of energy-dissipating layers, the finite element method analyses are used. Especially, setting or not setting of energy-dissipating layers and the cover depth of layers are studied. The research states that the energy-dissipating layer can Teally improve the resist blasting performance of the protective structures.If the energy-dissipating layer is buried in the upper soil cover, the resist blasting performance of the protective structures can be strengthened.The dimension of energy-dissipating layer can affect the resist blasting performance of the fabricated protective structures, and the analysis states that larger dimension of sandwich plates is beneficial to improve the resist blasting performance of the protective structure.