Numerical simulation of external loads on buried pipelines

Within the scope of the presented work, a simulation model was developed which completely depicts the buried pipeline and the surrounding soil. The model was validated using a number of analytical methods. The bedding conditions of the pipe trench are described by means of a standardized criterion which takes into account the filled soil type and the degree of compaction. The modular design allows the application of any loads, e.g. earth loads, traffic loads or temperature strains. The result provides a three-dimensional deformation plot of the pipeline and the ground. The “extended elastic analysis” according to DIN EN 1594 is used as stress criterion for structural integrity assessment. The model can be used to answer specific engineering questions, e.g. in the framework of structural modifications or construction of high-pressure gas pipelines. The holistic assessment can also be provided to authorized technical experts to support the scope of expert opinions.