ICE PILING UP AND ICE LOADS ON NARROW STRUCTURES: LABORATORY EXPERIMENTS AND MODELLING OF KINEMATICS

摘要

Kinematic model of the ice piling up near a fixed structure is formulated and steady pile solutions are analyzed for cylindrical structure of arbitrary shape. Conditions when the pile could be grounded are discussed. Experimental study of ice loads on vertical indenter pushed through the ice by hydraulic cylinder was performed in the ice tank in the UNIS cold laboratory. The indenter, which was equipped with an artificial bottom at the end for imitating shallow water effect, was pushed through the ice. The load on the piston was measured by a load cell with 50 Hz sampling frequency. Experiment was performed twice per day during several days in the same ice so that after several cycles the ice pile formed in the front on the indenter. Time records of the ice load versus the time are analysed and discussed in the paper.