The Characteristics Of Seismic Wave And The Response Of Adjacent Buildings On Underwater Explosion In Small Pools

At present, many blasting workers had done researches on the characteristics of explosion seismic wave, and they had made great achievements. But the simulations on dynamic response of ground structure to explosion seismic wave are still backward. Measured values of explosion seismic wave in small pool were used to analyze the attenuation law of explosion seismic wave and the response of adjacent building at experimental condition.RDX charge which TNT equivalent is lOg was used to simulate the engineering explosion of single charge or multi-charges in the existing experimental condition. Two kinds of explosion methods were considered, that is, one charge was at different horizontal distance but with the same water depth and charge weight, another was at the same horizontal distance and water depth but with different charge weights. The measured wave shapes divides into two parts among them, one part waves were gotten from the laboratorial yard, and another waves were gotten from the adjacent buildings. In order to simulate realistically field explosion in the experiments, the interaction of double charge explosion were considered specially. Finally, explosion seismic waves in various conditions in the pool were examined by the designed electrical measurement system, and a series of data were obtained by interpretation. After analyzing and treating these data, the calculation formula of explosion seismic velocity was obtained on both vertical direction and horizontal direction in various explosion seismic conditions, where coefficients in the formula were over 0.96, which can fit the accuracy of that experiment very well. That formula has some references to engineering blasting. Furthermore, the measured waves have been done the FFT transformation. Based on the characteristics of phase spectrum and power spectrum, the effects on buildings were analyzed, which has a certain guiding significance for the response of between maximum charge and building structure in small pool in the future.In LS-DYNA numerical simulation, it can draw the following conclusions from the numerical simulation on dynamic response of structures:The vibration velocity of particles in the structure pillar and beams nodes is obviously larger than that of slab in x, y and z direction respectively, furthermore, it has a certain displacement in the pillar and beam nodes in three direction respectively, and the displacement in y direction is obviously larger than that of the other two directions. The vibration velocity at the place of slab node on third floor is obviously larger than that of two floors. The velocity in the second floor is the least, which has good similarity with measured data. So from this it can see that underwater explosion has obvious effects on ground structures, especially to the adjacent high building. The vibration velocity of the top of building is usually larger than that of middle, which shows that elevation has a certain application effects.Figure[37] table[26] reference[39]...