Study On Dynamic Response And Design Of Cabin Structure Under The Action Of Gas Explosion

The gas explosion was a major disaster that caused heavy casualties and property losses under mine.Mobile capsule is widely used in order to increase the survival chances of coal underground workers,improve the working efficiency of the mine disaster rescue,and reduce casualties after a gas explosion.This paper mainly study on the distribution characteristics of impact load of gas explosion in underground tunnel,and the dynamic response characteristics of stiffened plate and foam aluminum core plate of mobile capsule under this load.Based on these research,structural design of actual rescue capsule and simulation verification are carried out successfully.Thesis has obtained the following results:(1)In general,the shape of tunnel section,the form of connection form and obstruction of the underground roadway have great influence on the spreading of explosive shock wave.Based on the theory of explosion,the general calculation method and the pressure increase factor of obstacle reflection pressure under the action of extremely strong and very weak shock waves in a one-way tunnel are given.Considering the gas explosion shock wave effect is dependent on the coal mine roadway environment,the working condition coefficient and safety coefficient are introduced in order to correct the nonlinear mathematical model of the extreme and very weak shock wave overpressure changing with the propagation distance.(2)With the use of Hamilton variational principle and the semi-analytic method,the discrete dynamic response model and the nonlinear motion control equation of the reinforced plate under the force of the explosive shock load are established.The factors affecting the dynamic response of reinforced panels,such as stiffeners,loads and panels,are obtained,and the dynamic response parameters of reinforced panels are optimized.(3)According to the three-phase analysis model of the sandwich board proposed by Fleck,the nonlinear dynamic response model of the foam aluminum sandwich structure was set up under the explosion shock load.The relationship between sandwich materials,density,thickness and response characteristics is revealed.Furthermore,the feasibility of applying the foam aluminum sandwich structure to the explosion proof door and escape door of lifesaving capsule is verified theoretically.(4)The door with the structure of foam aluminum sandwich board,and the cabin with the reinforced panels are all designed according to the theoretical analysis results of this thesis.They can meet the needs of the mobile capsule underground the coal mine for the people who can survive.What's more the numerical simulation is taken for the explosion shock of the underground gas.The result of simulation testify that the structure meets the safety requirements of coal mine.The results have improved the mathematical model of the propagation of gas explosion in the mine tunnel,and enriched the dynamic response theory of reinforced plate and foam aluminum sandwich structure.So,the findings of this thesis provide the theoretical support to the design of emergency safety facilities in underground coal mines and the structure of life capsule structures.