Test of Gravel to South Leg - Siri Platform

A grout connection between one of the legs of the offshore platform, Siri, and a water caisson at the seabed is failed. The failure leaves a gap in the grout connection meaning that the stiffness of the connection is disappeared resulting in movements of the platform. These movements cause cracks in the caisson, hence, the stiffness of the connection must be re-established.
In this report the effect of filling a sand material into the gap in the grout connection is investigated. Four types of sand materials is tested; Sand 0-8 mm, Norit 0-2 mm, Norit 0-5 mm, and Sand 0.4-5.6 mm. The comparison of the materials shows that Sand 0.4-5.6 mm performs better than the Norit materials and at least as good as Sand 0-8 mm. Thereby, it is concluded that of the tested materials Sand 0.4-5.6 mm is the best material to fill into the gap in the grout connection at the Siri Platform.