Observations from opening of a novel geotextile tube connection in field test site

A novel connection configuration for geotextile tubes was proposed, involving the insertion of an auxiliary tube between two main tubes, to ensure proper alignment and leveling when connecting them in a series, thus consolidating individual tubes into a unified structure while maintaining a consistent horizontal level. The novel connection was implemented at a test bed site in the Saemangeum reclaimed area, South Korea, to test exposure to the marine environment including sea waves, sun light exposure and reclamation process. This study presents the observations made upon opening the connection tube after 8 years. The observation shows that the connected geotextile tubes using the proposed auxiliary tube are suitable for use in long-term reclamation projects. • Observations of a novel geotextile connection tube after 8 years. • Formation of filter cake indicates that the tube has been stabilized, allowing water to pass through without loss of material. • Observations suggest that a connection tube length of 1-2D from the center is optimal for present case. • The novel connection tube is effective in maintaining an even vertical profile of the tube in the long term.