Experimental studies of the bischofite deformation properties

Determining rock properties is important for the design and construction of wells, as well as underground gas storages (UGS) in salt deposits. In modern practice, there are no experimental data on the strength and deformation properties of bischofite encountered during their construction. This data is necessary for calculating the stability of the rock mass around these facilities. Bischofite is a super hygroscopic mineral. It absorbs moisture and turns into a fluid state at the slightest contact with the environment. This makes it very difficult to place any measuring instruments on the sample and to obtain reliable data on its properties. Moreover, even with minimal mechanical impact, bischofite exhibits abnormally high plastic properties, and therefore it is difficult to apply the existing methods to determine the mechanical properties. The aim of the research was to develop and test a procedure for determining the bischofite deformation properties, including the development of measuring equipment that could be fixed on the sample, as well as a reliable interpretation of the resulting data. The tests were carried out on cylindrical bischofite samples in uniaxial mode at a constant loading rate. All the experiments were unique for the deformation properties of bischofite samples being determined for the first time. The paper details the equipment and materials used in the experiments paying much attention to interpreting the results of experimental studies.

Keywords: bischofite, hygroscopicity, deformation properties, uniaxial mode, constant loading rate, test methods, measuring equipment, laboratory tests, cyclic loading.
For citation:

Osipov Yu. V., Koshelev A. E., Voznesenskii A. S. Experimental studies of the bischofite deformation properties. MIAB. Mining Inf. Anal. Bull. 2020;(10):5-15. [In Russ]. DOI: 10.25018/0236-1493-2020-10-0-5-15.

Acknowledgements:

The study was funded by the Russian Foundation for Basic Research, grant 20-05-00341, and «Gazprom Geotechnologies» LLC.

Issue number: 10
Year: 2020
Page number: 5-15
ISBN: 0236-1493
UDK: 622.3
DOI: 10.25018/0236-1493-2020-10-0-5-15
Article receipt date: 01.06.2020
Date of review receipt: 10.08.2020
Date of the editorial board′s decision on the article′s publishing: 20.09.2020
About authors:

Yu.V. Osipov1, Senior Researcher, e-mail: yuhanna@list.ru,
A.E. Koshelev1, Cand. Sci. (Eng.), Head of Testing Laboratory Center, e-mail: a.e.koshelev@yandex.ru,
A.S. Voznesenskii, Dr. Sci. (Eng.), Professor, National University of Science and Technology «MISiS», 119049, Moscow, Russia,
1 Gazprom Geotechnologies Limited Liability Company, 123290, Moscow, Russia.

For contacts:

Yu.V. Osipov, e-mail: yuhanna@list.ru.

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