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Large-scale laboratory investigations on the sliding resistance of grounded ice rubble
This report describes an experimental investigation that addresses the resistance to sliding of grounded rubble on a fully saturated sediment bed. It was divided into two phases: in the first one, the sediments consisted of sand; in the second one, a local clay (Leda) was used instead. Testing was done in a concrete flume, 6 by 2.6 m in surface area, located in the CHC ice tank, and incorporating a four-sided enclosure (the ‘wagon’) 2 m by 2 m in surface area, used to contain the ice rubble. The ice was loaded incrementally with concrete slabs, for a total normal stress up to 20 kPa. The wagon was pulled by an actuator over a maximum distance of about 120 mm per test, while the force required to do so was measured with two load cells. Displacement rates ranged from 0.0035 to 0.3 mm/sec. The location of shear failure is believed to have been at the ice-sand interface for all tests. Testing with sand yielded friction coefficients of 0.65 and 0.62, for peak and residual shear stresses, respectively, with the peak response being attributed to dilatation. No effect of displacement rate was noted. Sediment freeze-up at the icesand interface increased friction substantially. The clay’s undrained shear strength, measured with a vane, was consistently higher than the sliding resistance of the ice in all tests. The vane data could therefore not be relied upon to provide a measure of sliding resistance. Also, during the test series, this parameter progressively increased to levels well exceeding the maximum normal stress applied to the clay. An alternative approach, based on the soil’s effective internal friction response, is assessed and proposed for estimating sliding resistance of real ice pads and other structures resting on a clay-rich seabed. ; Peer reviewed: Yes ; NRC publication: Yes
Large-scale laboratory investigations on the sliding resistance of grounded ice rubble
This report describes an experimental investigation that addresses the resistance to sliding of grounded rubble on a fully saturated sediment bed. It was divided into two phases: in the first one, the sediments consisted of sand; in the second one, a local clay (Leda) was used instead. Testing was done in a concrete flume, 6 by 2.6 m in surface area, located in the CHC ice tank, and incorporating a four-sided enclosure (the ‘wagon’) 2 m by 2 m in surface area, used to contain the ice rubble. The ice was loaded incrementally with concrete slabs, for a total normal stress up to 20 kPa. The wagon was pulled by an actuator over a maximum distance of about 120 mm per test, while the force required to do so was measured with two load cells. Displacement rates ranged from 0.0035 to 0.3 mm/sec. The location of shear failure is believed to have been at the ice-sand interface for all tests. Testing with sand yielded friction coefficients of 0.65 and 0.62, for peak and residual shear stresses, respectively, with the peak response being attributed to dilatation. No effect of displacement rate was noted. Sediment freeze-up at the icesand interface increased friction substantially. The clay’s undrained shear strength, measured with a vane, was consistently higher than the sliding resistance of the ice in all tests. The vane data could therefore not be relied upon to provide a measure of sliding resistance. Also, during the test series, this parameter progressively increased to levels well exceeding the maximum normal stress applied to the clay. An alternative approach, based on the soil’s effective internal friction response, is assessed and proposed for estimating sliding resistance of real ice pads and other structures resting on a clay-rich seabed. ; Peer reviewed: Yes ; NRC publication: Yes
Large-scale laboratory investigations on the sliding resistance of grounded ice rubble
Barrette, Paul (author) / Timco, Garry (author)
2009-02-01
doi:10.4224/20178993
Paper
Electronic Resource
English
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