Research And Numerical Analysis On Ice Fixed-point Blasting Technology

The ice flood of the Yellow River which happen suddenly, difficult to be predicted,hard to be rescued threat the safety of people’s life and property on both side of the Yellow River. Ice-flood control of Yellow Rive is still a daunting task quite a long time in the future.Ice fixed-point blasting is one of the most important ways in the ice-flood control of Yellow River So the ice fixed-point blasting technology must be studied. But the blasting mechanism is too complex to be studied.It’s hard to give analytical solution and the test cost is higher. So the use of numerical simulation can be more convenient for research.Now the research is mostly concentrated on the study of the single point blasting technology, less for research in group charges blasting technology. Combining with the field test,three-dimensional numerical calculation model of underwater fixed-point group charges blasting technology is established by LS-DYNA software to research.Underwater blasting technology has been introduced in this paper, including the current research of the underwater blasting, the physical phenomenon of underwater explosion shock wave, the bubble pulsation.This paper also analyzed the properties of ice, and large deformation theory and the ALE algorithm.Then numerical analysis of underwater fixed-point group charges blasting technology has been performed by LS-DYNA software.The underwater fixed-point group charges blasting technology was researched in two ways,through charges simultaneous blasting and millisecond delay blasting. Results show that the blasting simulation method of underwater fixed-point blasting,the parameters of the material, the crushing process of ice and the pressure of ice in the crushing process.The law of propagation of dynamic load of shock wave and dynamic load of bubble pulsation was researched in this paper.The reason why group charges blasting area is larger than the blasting area of same quantity single charge was found.The best depth of group charges blasting technology was got too.