摘要
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。
Regarding liquefied soil as fluid and using the vector method to analyze liquefaction velocity field based on the principle of fluid mechanics, the liquefaction velocity field was solved with the vector symbolic operation method. Thus, the analytical expression of lateral forces of underground structures in the liquefaction flow site was obtained. The parameter sensitivity of the analytical expression was analyzed. The results showed that the lateral force of underground structures contains both pressure resistance due to surface pressure and friction resistance due to shear stress; lateral force is mainly composed of inertial force and damping force, and it is related to fluid density, fluid viscosity, underground tunnel radius and vibration frequency of structures; with increase in fluid density, fluid viscosity and tunnel radius, added mass and added damping increase gradually; within a certain range, added mass and added damping are more sensitive to vibration frequency.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第19期58-62,共5页
Journal of Vibration and Shock
基金
国家自然科学基金(51408281)
中国博士后科学基金(2013M540442)
江苏省自然科学基金(BK20140108
BK20141090)
关键词
流变效应
液化场地
地下结构
侧向作用力
rheological effect
liquefied soils
underground structure
lateral force
