土性参数对罐体及罐基应力特性的影响

Influence of Soil Parameters on Stress Characteristic of Tank Body and Tank Foundation

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。

Foundation soil was looked as porous medium,based on the tank body and storage liquid coupling,tank body-foundation-ground interaction,porous medium solid-liquid coupling,a three-dimensional finite element model of shell-liquid-foundation-ground was built,and the influence of soil compression modulus,permeability coefficients and other factors on tank body and tank foundation stress was discussed.The results show that the influence of soil compression modulus on ground vertical stress isn＇t significant,and the additional vertical stress range caused by single tank is mainly 0.3D range of the tank bottom edge outer;with compression modulus decreased,the maximum value of pore water pressure of tank foundation,the peak value of maximum circumferential stress of tank body,and the peak value of maximum radial stress of tank bottom increased,but the peak value of maximum radial stress of tank wall remains unchanged and appears lag phenomenon;with permeability coefficients decreased,the ground vertical stress reduced gradually,and the peak value of pore water pressure increased;the influence of permeability coefficients on tank body stress is small relatively.