Rheological properties of rock salt under super longterm sustained uniaxial loading

Authors: Агеенко В. А., Скворцов А. А.

Rock salt is an almost impermeable, low-moist geological medium offering conditions for low-cost construction of underground openings. Sufficient strength and deep occurrence allows construction of large-volume underground reservoirs. Large volumes available as well as high pressure enable storage of huge quantities of active gas. When such reservoirs are constructed in rock mass by means of dissolution, stresses and strains in rock salt around underground openings change, which transforms mined-out open areas. During operation, convergence (reduction in volume of reservoir) takes place under the action of rock pressure as rock salt possesses pronounced rheological properties. Therefore, one of the major problems in construction of underground reservoirs is their long-term strength analysis. In this connection, an urgent point is to study physical and mechanical properties of rock salt. An emphasis should be laid on the time change in these properties as the reservoir stability is designed for the long-term period of operation under variable loads. The design life of underground reservoirs is 50 years. This study aimed to analyze rheological properties of rock salt within a long period of time. The unique nature of the tests lies in their duration. Russia yet lacks a federal-scale authorized procedure for determination of rheological and plastic properties of salt rocks. It is therefore problematic to select a routine of experiments to determine the rheological properties. We carried out uniaxial compression testing of samples subjected to different axial loads for one year. The experimental data on rheological properties of rock salt were proved in laboratory of Gazprom Geotechnology.


Keywords: Rock salt testing, creep curves, load mode, experimental creep curve, experimentation duration, geomechanics, volumetric strains, creep prediction time.
For citation:

Ageenko V. A., Skvortsov A. A. Rheological properties of rock salt under super longterm sustained uniaxial loading. MIAB. Mining Inf. Anal. Bull. 2019;(11):27-34. [In Russ]. DOI: 10.25018/0236-1493-2019-11-0-27-34.


Issue number: 11
Year: 2019
Page number: 27-34
ISBN: 0236-1493
UDK: 622.03
DOI: 10.25018/0236-1493-2019-11-0-27-34
Article receipt date: 16.09.2019
Date of review receipt: 01.10.2019
Date of the editorial board′s decision on the article′s publishing: 10.10.2019
About authors:

V. A. Ageenko, Graduate Student, e-mail: Valera.ageenko@mail.ru,

A. A. Skvortsov, Cand. Sci. (Eng.), Assistant Professor, e-mail: a.skvortsov@gazpromgeotech.ru,

National University of Science and Technology «MISiS», 119049, Moscow, Russia.

For contacts:

V. A. Ageenko, Graduate Student, e-mail: Valera.ageenko@mail.ru,

National University of Science and Technology «MISiS», 119049, Moscow, Russia.


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