Abstract
The paper presents some results of comparative tests for the strength properties of enclosing rocks from the coal deposits of Southern Yakutia. For example, the ultimate compressive strength of fine-grained sandstones from the Chulmakansky coal deposit was determined in two ways. In the former case, the authors determined maximum collapse pressure for cylindrical samples. In the latter case, arbitrary-shaped samples were tested by loading a sample with opposing indenters of conical shape. As a result, it was established that the difference in rock strength characteristics determined in the above-mentioned ways, does not exceed 20%. When determining rock strength by loading arbitrary-shaped samples with opposing indenters of conical shape, overestimated values are obtained as compared to the classical test. Nevertheless, point load method can be used in order to promptly determine the strength characteristics of sandstone in the course of mining operations provided the number of test samples in a series is increased.
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