Author(s): J. Heinonen; M. Maattanen
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Keywords: No Keywords
Abstract: Several punch tests for first-year ridge keels have been carried out for the EU-funded LOLEIF project. The tests have been performed in the Gulf of Bothnia, Finland, during winters from 1998 to 2000. In the punch test, a circular plate is pushed vertically downwards until the ridge keel collapses. An analytical limit load method is used for determining the strength parameters. The upper bound limit load is based on the balance between the external and the internal work rate. The internal work is defined by plastic dissipation describing the shear failure. Rubble strength is separated into two parts, cohesive and frictional strength by applying the Mohr-Coulomb yield criterion. The strength parameters cannot be defined by a single test. When geometrical quantities and the load eapacity with knowledge about the failure mode are measured, the limits for cohesion and friction are solved. Approximative values or bounds for rubble strength are found by applying the analytical model for several test sets.
Year: 2000