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该文将地基土看做多孔介质,考虑罐体与储液相互耦合、罐体-基础-地基之间的相互作用、多孔介质固液相耦合,建立壳-液-基础-地基三维有限元模型,探讨了地基土压缩模量、渗透系数等因素对罐体及罐基应力分布特性的影响。结果表明,地基土压缩模量对罐基竖向应力分布的影响不显著,单个储罐所引起的竖向附加应力主要集中罐底边缘外0.3D范围内;随压缩模量的减小,罐基孔隙水压力峰值、罐壁板与罐底板最大环向应力峰值、罐底板最大径向应力峰值逐渐增加,罐壁板最大径向应力峰值基本保持不变且出现滞后现象;随地基土渗透系数的降低,地基竖向应力逐渐减小,孔压峰值逐渐增加;地基土渗透系数对罐体应力的影响相对较小。
In this paper, the foundation soil is considered as porous media. Considering the mutual coupling of tank and liquid storage, the interaction between tank-foundation and foundation, and the solid-liquid coupling of porous media, a three-dimensional finite element model of shell-liquid-foundation- The effects of compressive modulus, permeability coefficient and other factors on the stress distribution of tank and tank foundation were discussed. The results show that the compressive modulus of foundation soil has no significant effect on the vertical stress distribution of the foundation. The vertical additional stress caused by a single storage tank mainly concentrates within 0.3D outside the bottom edge of the tank. With the decrease of compressive modulus, The peak value of pore water pressure, the peak value of maximum circumferential stress of tank wall and tank floor, the maximum radial stress peak of tank floor gradually increased, and the peak value of maximum radial stress of tank wall plate remained unchanged and lagged. With the permeability coefficient of foundation soil , The vertical stress in the foundation gradually decreases and the pore pressure peak value increases gradually. The permeability of the foundation soil has a relatively small influence on the tank stress.