ASSESSMENT OF EXCAVATABILITY INDEX OF FREEZABLE BLASTED ROCK MASS
S. V. Panishev, E. L. Al’kova, M. S. Maksimov
Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980 Russia
Keywords: Смерзание, прочность на срез, угол внутреннего трения, структурное сцепление, показатель трудности экскавации, Adfeezing, shear strength, internal friction angle, structural cohesion, excavatability index
Abstract
The regularities of change in mechanical characteristics of heterogeneous structure of frozen geomaterials depending on grain size composition, temperature, moisture content and density of sample packing are determined. It is found that the major influence is exerted on the shear strength, internal friction angle and cohesion in the samples structurally commensurable with blasted rock mass by temperature, moisture content and packing. In the size range of 10-40 mm of inclusions in a sample, the internal friction angle drops by 2 times while the cohesion jumps by the same value. It is shown that blasted frozen rocks prone to re-adfreezing is a complex medium possessing properties of intact uniform rock mass.
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