Study on the Unconfined Shear Strength of Large Columnar-Grained Freshwater Ice and Its Influential Factors
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Abstract:
Considering that the unconfined shear strength of large columnar-grained freshwater ice is associated with loading directions, loading strain rate and temperature, we conducted the unconfined shear test at the temperature of -0.5°C, -2°C, -5°C, -10°C and strain rates of 5.0 ? 10–5 s–1 to 5.0×10–2 s–1. Two loading modes were used in our test: vertical loading (the loading force was parallel to the crystal growth direction) and horizontal loading (the loading force was perpendicular to the crystal growth direction). The experimental results showed that (a) the shear strength increased with the decrease of temperature and strain rate under the given experimental conditions; (b) comparison of shear strength under the two loading directions showed that the anisotropy of mechanical properties was more obvious at the temperature of -5°C and -10°C, and the shear strength under the two loading directions had no visible distinction at the temperature of -0.5°C and -2°C; and (c) there was no significant correlation between the shear strength and gas bubble content when the gas bubble content was less than 8.65%.
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