Using the method combining experiments and numerical simulations,the dynamic behavior of explosion bubbles for the cylindrical charges with different length-diameter ratios(L/D)under fixed square plates was studied.Explosion tests of TNT explosives with the mass of 2.5 g and L/D of 1∶1 and 2∶1 under a fixed square plate was carried out,and the evolu-tion of explosive bubbles was recorded by the high-speed camera.ABAQUS software was used to numerically simulate the un-derwater explosion bubble evolution process of cylindrical charges with L/D of 5∶1,10∶1,and 20∶1 under vertical and horizontal settings.The results show that there is no obvious difference between the explosion of 2.5g TNT explosives with a L/D of 1∶1 and 2∶1 under the board.When the explosives are placed vertically,the difference in the initial shape of the explosion bubble caused by different L/D of the explosives will be quickly eliminated during the evolution of the bubble.More-over,the L/D and the starting position have effects on the water jet.When the explosives are placed horizontally,the sym-metry of the bubble and the shape of the water jet will be affected by the location of the initiation point.To be specific,for the detonation from the end face,there is a slight asymmetry in the process of the bubble expansion,and the jet is offset in the direction of the starting point.Moreover,the larger the L/D of the explosives,the wider the water jet in the explosion bub-ble,and the smaller the load of the water jet.For the detonation from the center,the explosive bubble forms a vertical water jet without offset.
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