考虑液化场地流变效应的地下结构侧向作用力研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (19) : 58-62.

论文

左熹 1,2，周恩全 3，任艳 2

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Study on lateral force of underground structure considering rheological effect ofliquefaction ground

ZUO Xi 1,2, ZHOU En-quan 3, REN Yan 2

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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、流体粘度、地下隧道半径及结构振动频率有关。随着流体密度、流体粘度、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。

关键词：流变效应；液化场地；地下结构；侧向作用力

Abstract

Regarding liquefied soil as fluid and using vector method analyzed liquefaction velocity field which is based on the principle of fluid mechanics, and it also solved velocity field by vector signal operation method. Thus, it is concluded that the analytical expression of underground structure affected by lateral forces in the liquefaction flow site. Finally, it also needs to do analysis about the parameter sensitivity of the analytical expression. The results show that lateral force of underground structure contains pressure and frictional when liquefied soils flow in lateral. Lateral force is mainly composed of inertial force and damping force, and it is related to fluid density, fluid viscosity, tunnel radius and vibration frequency of structures. With the increase of fluid density, fluid viscosity and tunnel radius, added mass and added damping are increasing gradually. Within a certain range, added mass and added damping are more sensitive to vibration frequency.

关键词

流变效应

/ 液化场地 / 地下结构 / 侧向作用力

Key words

rheological effect / liquefied soils / underground structure / lateral force

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左熹 1,2，周恩全 3，任艳 2. 考虑液化场地流变效应的地下结构侧向作用力研究[J]. 振动与冲击, 2016, 35(19): 58-62

ZUO Xi 1,2, ZHOU En-quan 3, REN Yan 2. Study on lateral force of underground structure considering rheological effect ofliquefaction ground[J]. Journal of Vibration and Shock, 2016, 35(19): 58-62

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