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Numerical investigation on rigid and flexible pipelines embedded in granular and self‑compacting materials

机译：粒状和自整体材料嵌入刚性和柔性管道的数值研究

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Self-compacting filling material or controlled low-strength material (CLSM) is a cementitious material which is liquid during filling, and it is used primarily as backfill, e.g., in trenches. Several products are currently used as CLSM such as flowable fill, controlled density fill, flowable mortar and low-strength plastic soil-cement. The low-strength requirement is necessary to allow for future excavation of CLSM. A two-dimensional numerical model was developed using the finite element system ABAQUS. In this model, the material behavior of granular soil and CLSM is described using an elasto-plastic constitutive model with Mohr-Coulomb failure criterion. Rigid and flexible pipes were modeled once embedded in sandy soil and once embedded in self-compacting material. The numerical model allows the modeling of the effect of hardening process on the overall behavior of the pipe-soil system. The main objective of this study is to investigate the behavior of rigid and flexible pipelines embedded in CLSM as a filling material numerically and to show advantages and disadvantages in comparison with the presently widely used filling materials like sand.
机译：自压填充材料或受控的低强度材料（CLSM）是填充过程中液体的水泥质材料，其主要用作回填，例如沟槽。几种产品目前用作CLSM，如可流动的填充，受控密度填充，可流动的砂浆和低强度塑料土壤水泥。低强度要求是必要的，以允许CLSM的未来挖掘。使用有限元系统ABAQUS开发了二维数值模型。在该模型中，使用具有MoHR-Coulomb失效标准的弹性塑性本构模型来描述粒状土壤和CLSM的材料行为。刚性和柔性的管道被建模，一次嵌入砂土中，一旦嵌入自压实材料。数值模型允许建模硬化过程对管道土系统的整体行为。本研究的主要目的是探讨CLSM中嵌入CLSM中的刚性和柔性管道作为填充材料的行为，并显示与目前广泛使用的砂材料如沙子相比的优点和缺点。

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