地层塌陷作用下埋地管道应变响应分析

为研究地层塌陷对埋地管道力学性能的影响，基于薄壳大变形和管土耦合作用，应用有限元软件对地层塌陷后未形成悬空的X65管道应变响应进行数值模拟，分析地层塌陷量、管道壁厚、埋深及地层土体性质（弹性模量、泊松比和粘聚力）对管道应变响应的影响规律。结果表明:管道的挠曲变形和轴向应变随着塌陷量的增大而增大，随着壁厚的增大而减小；上覆土粘聚力较大时，管道挠曲变形随着埋深的增加而减小；而当上覆土粘聚力较小时，管道挠曲变形随着埋深的增加而增大。地层土体泊松比对管道变形和应变影响较小；管道挠曲变形和轴向应变随着土体弹性模量和粘聚力的增大而增大，但不同地层沉降量下的轴向应变变化规律不同。

Strain Analysis of Buried Pipeline Under Strata Subsidence

The effect of strata subsidence on the mechanical behavior of buried pipelines was studied. Based on large deformation theory of thin shell and pipeline-soil interaction, strain response of X65 pipelines with no suspension under strata subsidence was simulated. The effect of key parameters on the mechanical behavior of buried pipelines were studied, including strata subsidence quantity, wall thickness, buried depth and soil properties. The results show that bending deformation and axial strain of buried pipelines increase with the subsidence quantity, but they decrease with wall thickness of the pipeline increasing. When the cohesion of the overlaying soil is bigger, the bending deformation of pipelines decreases with the buried depth increasing. But it increases with the buried depth increasing when the cohesion of the overlaying soil is smaller. Poisson's ratio of the soil has a small effect on the bending deformation and axial strain. Bending deformation and axial strain of buried pipelines increase with the increase of elastic modulus and cohesion, but the change rules of axial strain are different under different subsidence quantities.