Effect of Freeze-Thaw Cycles in Varied Temperature Range on Energy Intensity of Rock Failure
E. V. Zakharov
Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Russia
Keywords: Energy intensity of failure, temperature range, freeze-thaw cycles, porosity, carbonate rocks, limestone, dolomite
Abstract
The implemented research estimated the influence of multiple freeze-thaw cycles in varied temperature ranges on energy intensity of failure in dolomite from the Internatsionalnaya Pipe and in limestone of the Mokhsogolokh Quarry. It is experimentally proved that freeze-thaw in three-five cycles leads to decreasing energy intensity of failure in dolomite from the Internatsionalnaya Pipe irrespective of the temperature range. The highest decrease from 825 to 600 J/m2 (~ 27%) was observed in dolomite under ten freeze-thaw cycles in the temperature range of - 30 ... + 20°С in the samples in water medium. The energy intensity of the air-dried samples under the same conditions decreased from 825 to 700 J/m2 (~ 15%). The energy intensity of failure in limestone from the Mokhsogolokh Quarry decreased by 8-11% under five freeze-thaw cycles in water irrespective of temperature, while the energy intensity of the air-dried samples reduced by 1-8%.
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