大口径有压埋地管道穿越活动断层的非线性分析

Nonlinear Analysis of Large-diameter Buried Pipelines Filled with Pressurized Fluid Crossing Active Faults

摘要:

基于ABAQUS软件平台，建立穿越断层的管道、有压液体及周围土体的三维有限元模型，分别在静力荷载作用和地震作用下，对不同运动形式断层（走滑断层、正断层、逆断层）中的管道进行模拟，并对管道内有无有压液体进行对比分析。分别得到管道在静力荷载作用下和地震作用下空管道与有压管道的变形特征，将其进行对比分析，得到管道内液体的质量和压力在静力荷载作用及地震荷载作用下对管道的不同影响。结果表明：在静力荷载作用下管道内液体的质量和压力提高了管道的抗变形能力，使管道更安全；而在地震作用下管道内液体的质量和压力削弱了管道的抗变形能力，使管道更容易被破坏。

Abstract:

A three-dimensional finite-element model of a pipeline crossing a fault, the pressurized fluid, and the surrounding soil was established using the finite-element software ABAQUS. Pipelines in different faults (strike-slip fault, normal fault, and reverse fault) were simulated under static load and seismic load, and the conditions as regards whether the pipelines were filled with pressurized fluid were compared and analyzed. The deformation behaviors of pipelines with and without pressurized fluid under static load and seismic load were obtained. By comparing the behaviors, the influences of the mass and pressure of the fluid on the pipelines under static load and seismic load were obtained. The results show that the fluid in pipelines improves the deformation resistance of the pipeline under static load; thus, the pipelines are safer; however, under seismic load, the fluid triggers the deformation resistance of the pipeline, and thus, the pipelines are less safe.