Experimental Investigation and Modelling of Monotonic and Cyclic Soil-Pipeline Interaction in Multiphase Soil

The worldwide growing demand for energy requires a significant expansion of underground pipeline infrastructures. However, buried pipelines are prone to failure due to changing earth pressures under monotonic and cyclic loads. Pipelines, often shallowly buried in naturally unsaturated soils, have climate-related wetting and drying cycles in the surrounding soil, affecting the matrix suction stress and, thus, the soil’s shear strength, stiffness, and overall soil-pipeline interaction. This thesis investigates the complex interactions between soil and buried pipelines, which play an important role in the design, installation, integrity, functionality, performance, and lifespan of energy networks. The particular focus is on the interaction of unsaturated sandy soil conditions. The goal is to improve the understanding of the soil-pipeline interaction, thus providing engineers and practitioners with valuable insights beyond empirical approaches or single-phase soil mechanical assumptions. The study employs a comprehensive methodology, including experimental investigations, analytical analysis, constitutive modelling, and artificial neural network (ANN) model development.




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