Dynamic response of existing large oil storage tank under blasting excavation vibration
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摘要: 针对既有大型储油罐近区基础爆破开挖中的安全问题，采用ANSYS/LS-DYNA的隐式-显式顺序求解方法，结合流固耦合算法，研究了爆破振动下大型储油罐的动力响应规律。分析了罐壁不同位置的质点振速，由于质点振速分布情况较为复杂，不宜用局部质点振速判断罐壁危险点；总结了罐壁上应力的分布规律，结果显示爆破振动对储油罐的影响主要集中在迎爆侧下部，且在罐壁迎爆侧高度为3 m左右的位置最易发生象足屈曲；分析了不同频率爆破振动作用下满载储罐罐壁的质点振速，结果表明在爆破振动主频范围内，载荷频率远大于储罐固有频率条件下，罐壁上质点振速随着爆破振动频率的降低呈减小趋势；建立了储油罐罐壁质点振速与罐内液面高度的关系，结果表明降低液面高度可以有效提高储油罐的爆破振动安全阈值，爆破施工中邻近储罐储液高度不宜高于10 m。Abstract: Aiming at the safety problem of existing large oil tank under near base blasting excavation, the dynamic response of large oil tank is analyzed by numerical simulation method, based on the implicit-to-explicit sequential solution procedure and the fluid solid coupling algorithm of ANSYS/LS-DYNA. different positions are obtained, by which it is not appropriate to determine the dangerous point of the tank wall because the distributions of the particle vibration velocities are very complex. The dynamic stress distribution on the tank wall is summarized, and the results show that the influence of blasting vibration on the oil tank is mainly concentrated on the lower part of the explosion side, and that the elephant foot buckling deformation is most likely produced at the height of 3 meters on the detonation side of tank wall; The particle vibration velocity of the tank wall under different frequency of blasting vibration is analyzed. The results show that in the main frequency range of blasting vibration, the particle vibration velocity on the tank wall decreases with the decrease of blasting vibration frequency if the load frequency is much larger than the natural frequency of the tank; The relationship between the particle vibration velocity and the liquid level in the tank is established, and the results show that lowering the height of liquid level can effectively improve the safety threshold of blasting vibration of the oil tank, and the storage liquid height of adjacent storage tanks should not be higher than 10 m for blasting operations.
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Key words:
- implicit-to-explicit /
- fluid solid coupling /
- blasting /
- large oil storage tank /
- dynamic response
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图 1 隐式-显式顺序分析流程图
Figure 1. Flow chart of implicit-to-explicit sequential solution procedure
图 7 x方向质点振速沿高度的变化曲线
Figure 7. Curves of the particle vibration velocity vs. height along x direction
图 8 z方向质点振速沿高度的变化曲线
Figure 8. Curves of z direction particle vibration velocity vs. height
图 9 测点在罐壁圆周上的位置
Figure 9. Positions of measuring points on the circumference of tank wall
图 10 沿罐壁圆周不同位置的质点振速
Figure 10. Particle vibration velocity of different measuring points along the circumference of the tank wall
图 12 罐壁上应力沿周向的分布情况
Figure 12. Distribution of stress along the circumferential direction of the tank wall
图 13 罐壁质点振速与罐内液体液面高度的关系
Figure 13. Curves of particle vibration velocity vs. liquid level in tank
图 14 罐壁正面顶部x向的质点振速与载荷频率的关系
Figure 14. Curves of the particle vibration velocity vs. load frequency along x direction
图 15 罐壁正面顶部z向的质点振速与载荷频率的关系
Figure 15. Curves of the particle vibration velocity vs. load frequency along z direction
表 1 罐壁详细参数
Table 1. Detailed parameters of tank wall
层数 壁厚/mm 层高/mm 材料 1 32.0 2 420 SPV490Q 2 27.0 2 420 SPV490Q 3 21.5 2 420 SPV490Q 4 18.5 2 420 SPV490Q 5 15.0 2 420 SPV490Q 6 12.0 2 420 SPV490Q 7 12.0 2 420 SPV490Q 8 12.0 2 380 Q-235A.F 9 12.0 2 380 Q-235A.F 
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表 2 材料基本参数
Table 2. Basic parameters of the materials
材料 E/GPa μ ρ/(kg·m-3) ν/(MPa·s) G/GPa Et/GPa σs/MPa 罐体 210.00 0.30 7 850 - - 22.06 490 基础 - 0.25 2 700 - 15.40 - - 液体 2.18 - 1 000 1.13 - - - 空气 0 - 1.20 - - - -
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表 3 储油罐前20阶模态
Table 3. The first 20 modes of storage tank
阶 频率/Hz 流固耦合模态
(本文)空罐模态 本文 文献[9] 1 0.357 27 1.151 6 1.153 7 2 0.357 32 1.151 6 1.153 7 3 0.358 18 1.159 3 1.161 9 4 0.358 18 1.159 3 1.161 9 5 0.363 38 1.164 1 1.165 4 6 0.363 38 1.164 1 1.165 4 7 0.365 83 1.190 1 1.192 8 8 0.365 89 1.190 1 1.192 8 9 0.376 52 1.194 2 1.194 2 10 0.376 57 1.194 2 1.194 2 11 0.380 07 1.239 3 1.237 3 12 0.380 07 1.239 3 1.237 3 13 0.396 89 1.246 5 1.249 4 14 0.396 89 1.246 5 1.249 4 15 0.400 39 1.297 3 1.292 3 16 0.400 46 1.297 3 1.292 3 17 0.424 61 1.331 4 1.334 5 18 0.424 65 1.331 4 1.334 5 19 0.426 53 1.366 2 1.356 6 20 0.426 53 1.366 2 1.356 6
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