液化场地下埋地管道上浮反应影响因素分析

Influence factor analysis of floatation response of buried pipeline in liquefied soil

液化场地下埋地管道上浮反应是管道破坏的主要原因,避免因上浮造成的管道破坏,是城市地下生命线工程建设中急需解决的问题。利用ADINA有限元分析软件,建立了液化场地下埋地管道上浮反应的管土接触-土弹簧分析模型。考虑了非液化区的管土接触作用和液化土的非线性约束作用,对埋地管道的上浮位移及轴向应力进行了分析,探讨了管道自身以及液化土的一些参数对埋地管道上浮反应的影响。结果表明:管径、液化土密度,液化区长度越大,埋深、壁厚越小,管道的变形越大,破坏越严重,并给出了几点工程建议。

Floatation response of buried pipeline in liquefied soil is a main reason of buried pipe＇ s damage. It is necessary to avoid the buried pipelines damage caused by floatation response in earthquake lifeline engineering. An analytic model of pipe soil contact-soil spring for the mechanical response of buried pipeline in liquefied soil was established by using finite element analytical software ADINA. Both the pipe-soil contact in non-liquefied area and the nonlinear soil constrain effects in liquefied area were considered. The floatation displacement and axial stress of the buried pipeline caused by floatation response were analyzed. And the influence of pipeline itself and liquefied soil parameters on the floating response was discussed. The larger the diameter of pipe, density of liquefied soil, length of liquefied area and the smaller the depth of pipe buried, thinner wall of pipe are, the easier the pipe deformation is and the more seriously the pipe damages.