Ice Action on Riprap Small-Scale Tests,
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
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We conducted 35 small-scale experiments to assess the damage on riprap-covered banks by ice shoving. A review of literature on this subject revealed very litte experience or guidance available for the design of riprap in the cold regions, where presence of moving ice can cause substantial damage too riprapped bank. During the experimental program, we changed the slope of the model riprap bank, the size and the mix of rocks, and the thickness of model ice sheets. Results of these tests are presented in terms of measured horizontal and vertical forces, outcome of interaction as pileup or ride-up events, and damage to the model riprap bank. From the observations made during the tests, the damage to the riprap appears to take place during pileup events, because the incoming ice sheet is forced to go between the riprap and the piled-up ice, bringing with it rocks from the bottom to the surface of an ice pile. To sustain no damage to the riprapped protective layer, maximum rock size D100 should be twice the ice thickness for shallow slopes and about three times the ice thickness for steeper slopes.
- Hydrology, Limnology and Potamology
- Snow, Ice and Permafrost