Abstract

The indentation of rock particles into ice is an important aspect of understanding subsea interactions involving ice features and gravelly soil. This article investigates the indentation of rock particles into an ice specimen, where observations are made to study the effect of changes in indentation rate and the relative spacing from previously formed damage zones on resulting force and pressure trends. Experiments were conducted for three indentation rates: 10 mm/s, 0.5 mm/s, and 0.01 mm/s. Observations were also completed for three unique spacing distances between the rock particle and previous damage zones, taken as 2D (26 mm), 5D (65 mm), and 7D (96 mm), where the diameter D was based on a mean rock diameter of 13 mm. Maximum observed forces and pressures exerted onto the ice by the rock particles are examined and compared based on changes in the noted test parameters. These were completed alongside observations from tests conducted using 170 g samples of rocks ranging in size from 9.5 mm to 19.1 mm for tests completed at an indentation rate of 0.5 mm/s for indentation depths of 5 mm and 7 mm. In addition, preliminary results are presented from a matlab model that has been developed based on the aggregation of independent, individual particle–ice interaction events to simulate multiple particle–ice interactions. A comparison of experimental and simulated results indicates good general agreement and supports the assumption of independent particle–ice indentation events for the interaction conditions considered.

References

1.
Schulson
,
E. M.
, and
Duval
,
P.
,
2009
,
Creep and Fracture of Ice
,
Cambridge University Press
,
Cambridge, UK
, p.
416
.
2.
ISO 19906
,
2019
,
Petroleum and Natural gas Industries—Arctic Offshore Structures
,
International Organization for Standardization
,
Geneva, Switzerland
.
3.
Jordaan
,
I. J.
,
2001
, “
Mechanics of Ice-Structure Interaction
,”
Eng. Fract. Mech.
,
68
(
17–18
), pp.
1923
1960
.
4.
Taylor
,
R. S.
, and
Richard
,
M.
,
2014
, “
Development of a Probabilistic ice Load Model Based on Empirical Descriptions of High Pressure Zone Attributes
,”
International Conference on Offshore Mechanics and Arctic Engineering
,
San Francisco, CA
,
June 8–13
.
5.
Barrette
,
P.
,
Pond
,
J.
, and
Jordaan
,
I.
,
2002
, “
Ice Damage and Layer Formation in Small Scale Indentation Experiments
,”
Ice in the Environment, Proceedings of the 16th International Symposium on Ice, IAHR
,
Dunedin, New Zealand
,
Dec. 2–6
, pp.
246
253
.
6.
Wells
,
J.
,
Jordaan
,
I.
,
Derradji-Aouat
,
A.
, and
Taylor
,
R.
,
2010
, “
Small-Scale Laboratory Experiments on the Indentation Failure of Polycrystalline Ice in Compression: Main Results and Pressure Distribution
,”
Cold Reg. Sci. Technol.
,
65
(
3
), pp.
314
325
.
7.
Zou
,
B.
,
1996
, “
Ships in Ice: The Interaction Process and Principles of Design
,” Ph.D. thesis,
Memorial University of Newfoundland
,
Newfoundland, Canada
.
8.
Spencer
,
P. A.
,
2013
, “
Unifying Local and Global ice Crushing Pressures
,”
Proceedings of the 22nd International Conference on Port and Ocean Engineering Under Arctic Conditions
,
Espoo, Finland
,
June 9–13
, pp.
221
230
.
9.
Sanderson
,
T. J. O.
,
1988
,
Ice Mechanics: Risks to Offshore Structures
,
Graham & Trotman
,
London
, pp.
88
92
.
10.
Browne
,
T.
,
Taylor
,
R.
,
Jordaan
,
I.
, and
Gürtner
,
A.
,
2013
, “
Small-Scale ice Indentation Tests With Variable Structural Compliance
,”
Cold Reg. Sci. Technol.
,
88
, pp.
2
9
.
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