Rheological properties of rock salt under super longterm sustained uniaxial loading

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.

 

Acknowledgements:
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
Authors: Ageenko V. A., Skvortsov A. A.
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.

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

1.    Kravchenko O. S., Filimonov Yu. L. Deformation of rock salt under increased temperature. MIAB. Mining Inf. Anal. Bull. 2019;(1):69-76. [In Russ]. DOI: 10.25018/0236-1493-2019-01-069-76.

2.    Filimonov Y., Lavrov A., Shkuratnik V. Acoustik emission in rock salt: effect of loading rate. Strain, 2002. Vol. 38, Pp. 157—159.

3.    Singh A., Kumar C., Gopi Kannan L., Seshagiri Rao K., Ayothiraman R. Engineering properties of rock salt and simplified closed-form deformation solution for circular opening in rock salt under the true triaxial stress state. Engineering Geology, 2018, 243, 218—230.

4.    Sрkuratnik V. L., Kravchenko O. S., Filimonov Yu. L. Experimental research of stress and temperature dependences of acoustic emission and rheological characteristics of rock salt . Fizikotekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2019, no 4, pp. 20—26. [In Russ].

5.    Singh A., Kumar C., Kannan L. G., Rao K. S., Ayothiraman R. Estimation of creep parameters of rock salt from uniaxial compression tests. International Journal of Rock Mechanics and Mining Sciences, 2018, 107, 243—248.

6.    Konstantinov S. A., Vaulin I. B., Il'inov M. D. Some results of tests of samples of salt rocks on creep. Izvestiya vysshikh uchebnykh zavedeniy. Gornyy zhurnal. 2008, no 2, pp. 118—122. [In Russ].

7.    Il'inov M. D., Kartashov Yu. M. A rapid method for determining the rheological properties of rocks. Zapiski Gornogo instituta. 2011. Vol. 190, pp. 207—209. [In Russ].

8.    Ageenko V. A. Investigation of rheological properties of rock salt. Izvestiya Ural'skogo gosudarstvennogo gornogo universiteta. 2019, no. 1(53), pp. 115—120. [In Russ].

9.    Tavostin M. N. The influence of stress state on the rheological properties of rock salt. Gornyy informatsionno-analiticheskiy byulleten’. 2000, no 8, pp. 125—128. [In Russ].

10.   Pestrenin V. M., Pestrenina I. V., Merzlyakov A. F. The creep of rock salt samples in experiments on compression. Izvestiya vysshikh uchebnykh zavedeniy. Gornyy zhurnal. 2012, no 1, pp. 119—124. [In Russ].

11.   Koshelev A. E. Obosnovanie i razrabotka metoda opredeleniya mekhanicheskikh svoystv kamennoy soli s uchetom nachal'nogo polya napryazheniy [Substantiation and development of a method for determining the mechanical properties of rock salt taking into account the initial stress field dissertation], Candidate’s thesis, Moscow, 2013, 143 p.

12.   Proskuryakov N. M., Livenskiy V. S., Kartashov Yu. M. Rheological properties of salt rocks. Razvitie kaliynoy promyshlennosti: obzornaya informatsiya [Development of the potash industry: an overview], Moscow, 1974.

13.   Brandao N. B., Roehl D., Romanel C. Enhanced double-mechanism creep laws for salt rocks. Acta Geotechnica, 2019, 13(6), 1329—1340.

14.   Pan'kov I. L., Udartseva A. A. Experimental study of deformation of salt rocks under creep. Geologiya i poleznye iskopaemye Zapadnogo Urala. 2011, no 11, pp. 205—207. [In Russ].

15.   Kartashov Yu. M., Matveev B. V., Mikheev G. V., Fadeev A. B. Prochnost' i deformiruemost' gornykh porod [Strength and deformability of rocks], Moscow, Nedra, 1979, 269 p.

16.   Asanov V. A., Pan'kova I. L. Study of features of deformation of salt rocks at long loading. Gornyy informatsionno-analiticheskiy byulleten’. 2010, no 1, pp. 105—110. [In Russ].

17.   Asanova V. A., Pan'kova I. L., Anikina V. V. Deformation of salt rocks under prolonged loading. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2011, no 4, pp. 50—56. [In Russ].

Subscribe for our dispatch