Abstract Nonlinear structural response of buried continuous pipeline undergoing strike-slip fault rupture, i.e., where soil masses get displaced in the horizontal plane along a fault line, is studied in a detailed manner. A detailed analysis technique employing ABAQUS/Standard with implicit formulation to study the behavior of buried continuous pipelines crossing fault movements is proposed and established with suitable validations. A three-dimensional nonlinear finite element (FE) model including both material and geometric nonlinearities is used for this study. Firstly, a non-linear sand constitutive model is adopted and implemented in commercial FE package ABAQUS. The adopted material model is validated with available experimental tri-axial test results. This material model is thereafter suitably calibrated to develop a FE model of buried pipeline undergoing fault rupture for a specific large-scale experimental test. The study identified important soil strength parameters from direct shear soil tests conducted for the large-scale test program and converted them suitably with respect to the adopted sand constitutive model. The FE model is then validated against full-scale experimental results. It is observed that the developed FE model yields highly accurate results in comparison to available numerical results for this experiment. Analysis results indicated that, consideration of sand non-linear mobilized shear strength appropriately in numerical modelling may result in significantly improved prediction of generated pipeline strains with increasing fault displacements.

中文翻译：

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使用非线性砂模型在 3D 中经历走滑断层破裂的埋地管道的结构性能

摘要 详细研究了地下连续管道在走滑断层破裂时的非线性结构响应，即土体沿断层线在水平面位移的情况。使用带有隐式公式的 ABAQUS/Standard 来研究埋地连续管道穿越断层运动的行为的详细分析技术被提出并通过适当的验证建立。本研究使用了包含材料和几何非线性的三维非线性有限元 (FE) 模型。首先，在商业有限元软件包ABAQUS中采用并实现了非线性砂本构模型。采用的材料模型通过可用的实验三轴测试结果进行验证。此材料模型此后经过适当校准，为特定的大规模实验测试开发经历断层破裂的埋地管道的有限元模型。该研究从为大型试验项目进行的直接剪切土壤试验中确定了重要的土壤强度参数，并根据采用的砂本构模型对它们进行了适当的转换。然后根据全尺寸实验结果验证有限元模型。据观察，与该实验的可用数值结果相比，开发的有限元模型产生了高度准确的结果。分析结果表明，在数值模拟中适当考虑砂岩非线性动抗剪强度可能会显着提高对随着断层位移增加而产生的管道应变的预测。