At the end of 2018, a large scale landslide was identified near the Rigth of Way of one of the pipelines operated by Cenit Transporte y Logística de Hidrocarburos. In this zone it was possible to identify a populated area and a principal river. At the beginnig the depth of the Landslide did not represent a hazard to the pipeline due to the Horizontal Directional Drilling technique applied when the pipeline was built. A monitoring program was developed through inclinometers and piezometers and In Line Inspections were carried out in order to identify any disturbance in the alignment of the pipeline.From the monitoring program and In Line Inspection data it was possible to confirm interaction between landslide and pipeline. A perpendicular force to the pipeline alignment produces a bending strain at two points, and landslide interacts with the pipeline aproximatedly 170 m. Its failure surface was in between 17 to 22 m, and the pipeline was about 15 m.Due to this interaction it was necessary to develop a risk assessment in order to identify a safe limit displacement. For a while, this allowed us to design both a temporal innovative solution considering a flexible pipeline and a definitive solution to build the new segment of the pipeline which was deeper than the last one, through the Horizontal Directional Drilling technique.

Natech Risk Assessment and Control Through Innovative Risk Reduction Measures – Pipeline / Landslide Interaction Case

Paper Proceedings: https://asmedigitalcollection.asme.org/IPG/IPG2021/volume/85055

ASME 2021 International Pipeline Geotechnical Conference (IPG2021)

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