This paper describes the framework developed for the geological investigation and crossings design of an onshore pipeline project being implemented in Northern Greece. Scientific and technological concepts for geological investigation are based on the results provided by local engineering companies and research institutes specialized in applied geotechnical and geophysical research. The basics of the crossings design are developed such as, the evaluation of the suitable pipe wall thickness and the design of the technically essential pipeline encroachments with railways, roads, channels, rivers, underground utilities, active faults and soils prone to liquefaction. Special reference has made to the seismic hazard assessment required for evaluation of the seismic characteristics at crossing areas, as well as the finite element study performed to define pipeline stresses and strains developing in active fault areas. Finally the severe seismic conditions of Greece entailing particular design requirements and protection measures for the buried pipeline are demonstrated.

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