| It is often necessary to blast the rock foundation in the near area of the oil storage tank due to the constraints of geography and geological conditions in the reconstruction and expansion of the national oil reserve base.The blasting earthquake effect seriously affects the structural safety of the non-anchored oil storage tank in service.In order to ensure the safety of oil storage tanks in service during blasting,it is necessary to systematically study the dynamic response and failure mechanism of the non-anchored storage tanks under blasting load.In this paper,the failure mechanism of vertical storage tanks under the influence of seismic waves is firstly analyzed and summarized.And then,a set of experimental equipment that can measure multiple parameters at the same time and can be repeated many times is designed,and the dynamic response law of the non-anchored tank under the impact of the blasting impact load is simulated.Finally,the ANSYS simulation software has been used to extend the research.The comprehensively conclusions are drawn,which can be used for reference in design and construction.1.The horizontal velocity of blasting vibration in the vicinity of blasting source is the largest in the direction of the connection between the blasting center and the tank core.Both the vertical velocity and acceleration of the vertical wall of the tank have an elevation amplification effect.However,the vibration velocity of the tank wall particle in the normal direction of the tank wall does not show the elevation amplification effect,and the vibration velocity of the tank bottom to the tank height in the 1/5 position decreases with the height of the tank.2.Under the action of blasting vibration,the reservoir height has a great influence on the dynamic response of the non-anchored storage tank.With the increase of the height of the storage liquid,the peak acceleration,velocity and strain of the tank are enhanced as a whole.Especially when the liquid storage is greater than 1/2,the velocity and acceleration of the tank mass increase significantly with the increase of storage height.Therefore,in order to ensure the safety of the tank wall,the storage tank height should not be greater than that of 1/2 tank.3.The dynamic parameters of the tank under blasting vibration are distributed along the wall of the tank: the bottom of the tank wall to the tank top,and the overall attenuation trend.The annular distribution along the tank wall is: from the side facing the explosion to the detonation surface,it decreases first and then increases slightly.Below 1/5 of the height of the tank wall,the peak value of the strain peak is relatively large,and the extreme value is mainly concentrated at the bottom of the face of the impingement surface of the tank wall.The bottom of the face of the impingement surface of the tank wall is a dangerous position.The result of the bottom of the tank shows that the radial stress of the bottom plate of the tank is prominent,and the strain at the bottom edge of the tank is the largest,which is the dangerous position of the bottom plate.4.Analysis of the vertical displacement of the bottom plate of the storage tank shows that the height of the storage liquid increases,and the lift-off effect of the bottom plate of the storage tank is enhanced.The point at which the lift-off height of the bottom of the tank bottom is the maximum is not necessarily the time when the vibration wave arrives,but the vibration wave passes,and the higher the liquid storage height is,the earlier the lift-off peak height appears. |
PDF Full Text Request