关键词: 浅埋输液管道, 管-液耦合, 管-土耦合, 压力脉动, 行波法

Abstract: In consideration of coupled influence among soil- structure-fluid interaction, static and dynamic analysis of buried pipeline system conveying fluid is investigated by employing the traveling wave method. The dynamic analytical model of the shallowly buried pipeline is established based on soil-structure interaction (SSI) and fluid-structure interaction (FSI) theories; and the static and dynamic formulations are deduced by applying the equilibrium condition of forces. The analytical results are obtained by employing the traveling wave method. Based on the above work, the stress characteristics of the buried pipeline under fluid impulsive excitation are studied. Analysis results of numerical examples indicate that FSI can cause bigger stress level in the shallow buried pipeline. The stress amplitude of pipe under FSI has a remarkable change with the less amplitude variation of the fluid pulsation. In addition, the influences of embedded depth H, soil property and pipe radius R on pipe stress are discussed. Under the same impulse excitation action, the pipe stress reduces with the increasing of H, the soil spring stiffness and pipe radius R.

Key words: shallowly buried fluid-conveying pipeline, SSI, FSI, pressure pulsation, traveling wave method