Uniaxial and triaxial compression tests are standard methods of determining the strength and deformation characteristics of rock salt samples. The results obtained from such tests can provide useful data for assessing the deformation behavior of pillars in mining deposits. Relative axial and lateral strains were measured by two gauges installed on the motley sylvinite and rock salt samples. Studies on the influence of sample shape (ratio of the height of the samples to its diameter) rock salt on their mechanical properties were performed by tests on core materials. The triaxial compression tests were performed under axial load at a constant lateral pressure. The triaxial compression test data were used to construct the uniform relationships of Chanyshev's theoretical model.

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