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将液化流动的土体视为流体,基于流体力学原理,运用矢量法进行液化速度场的分析,并通过矢量符号运算法求解速度场,得出地下结构在液化流动场地中受到侧向作用力的解析表达式,并对解析表达式中的参数进行灵敏度分析。结果表明:在液化土体横向流动时,地下结构所受侧向作用力既包含表面压力引起的压力阻力,又包含剪应力引起的摩擦阻力。侧向作用力主要由惯性力和阻尼力组成,并与流体密度、流体黏度、地下隧道半径及结构振动频率有关。随着流体密度、流体黏度、隧道半径的增大,附加质量和附加阻尼均逐渐增加;在一定范围内,附加质量和附加阻尼对振动频率较为敏感。
The liquefied soil is regarded as fluid. Based on the principle of fluid mechanics, the liquefaction velocity field is analyzed by the vector method and the velocity field is solved by the vector symbol method. The result shows that the subsurface structure is subjected to lateral force in liquefied flow field Parse the expression and perform sensitivity analysis on the parameters in the parse expression. The results show that when the liquefied soil flows in a horizontal direction, the lateral force suffered by the subsurface structure not only includes the pressure resistance caused by the surface pressure but also the frictional resistance caused by the shear stress. Lateral forces are mainly composed of inertial forces and damping forces, and are related to fluid density, fluid viscosity, radius of underground tunnels and structural vibration frequency. With the increase of fluid density, fluid viscosity and tunnel radius, the additional mass and additional damping increase gradually. In a certain range, additional mass and additional damping are more sensitive to vibration frequency.