V. A. Ageenko / News of the Ural State Mining University. 2019. Issue 1(53), pp. 115-120

Relevance. Methods for determining durability during long-term operation of underground reservoirs created by chemical degradation do not cover the diversity of factors affecting them, therefore not only the geometrical parameters of workings, but the minimum allowable pressure of the stored product as well are considered with a significant margin. Creating reliable methods for determining the basic parameters of underground reservoirs is associated with the study of the physical and mechanical properties of salt rocks. Due to the fact that halogen rocks (even with a minimal mechanical effect) exhibit plastic properties, the applicability of the existing standardized methods for determining various mechanical properties to them, in our opinion, is debated. This is confirmed by the fact that there is still no methodology in Russia for determining the rheological and plastic properties of salt rocks. In this regard, the choice of methods of conducting tests to determine rheological properties is problematic.
The purpose of the study is the performance of an experiment and test a new method for predicting creep curves.
Methods and results. This paper focuses on the uniqueness of the experimental determinations of rheological properties of salt rocks. Experimental techniques are described. Much attention is paid to the study of the required duration of the experiment to determine the rheological characteristics. Regularities were found with creep curves depending on the experiment time and the required time for this was proposed. The method for predicting the creep curve for 300 h over the first 60 min of creeping is described. This method of description is a new method in comparison with other related studies on this topic. The accumulated experience of experimental data provides the basis for the development of a standard for determining the complex of physical and mechanical properties of halogen rocks. The described surveys were tested by OOO Gazprom Geotechnology.
The conclusion is the presence of a new proposed method for predicting the experiment for the first 40 minutes of creeping.

Keywords: salt rock test, creep curves, loading conditions, experimental creep curve, experiment timing, geomechanics.

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