A liquefied natural gas (LNG) plant is currently being constructed on a hydraulic fill in El Musel Port (Gijon, Northern Spain). The hydraulic fill is mainly composed of marine sands dredged from nearby locations, and it was placed on site using the rainbow and pipeline discharge and the bottom dump methods. The dynamic loads imposed by some of the plant elements suggested the need to conduct soil improvement using vibro-methods. To identify the most suitable method among those available, several options (including vibro compaction, and vibro-substitution using the bottom and top feed methods) were considered in a trial field. Monitoring and control methods included the use of geophysical methods as well as DPSH and SCPTU tests. This paper presents the results of the monitoring conducted at such trial field before and after the different treatments were employed, and it illustrates the degrees of improvement achived using each one.
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