Development of stress and strain state of combined support for a vertical shaft driven in salt massif

The paper presents a study of stress-strain state of a combined shaft lining of an extended section of a vertical shaft developed in a salt massif at a depth of 1250 m. A prediction of stress-strain state of lining was carried out for 4 sections along the shaft at depths of 500 m, 750m, 1000m and 1250 m. Within the framework of the research, stressstrain state development of combined shaft lining “rigid” — cast-iron-concrete lining and compressible lining, the inner layer is made of cast-iron tubing and the outer one of polystyrene foam. The size of the concrete and compression layer was assumed to be 300 mm. To increase prediction accuracy of stress-strain state of cast-iron tubing column is considered taking into account geometric configuration of tubing with marking of size 7,5—100 made of cast-iron grade EN-GJS-700—2. Solution of the problem is carried out in volumetric formulation taking into account development of long-term creep deformations which take place during 50 years of mine working life. Value of initial stress field is equal to hydrostatic pressure which is realized on considered parts of vertical shaft. Within the framework of the research work, stresses realised in cast-iron tubing lining have been compared and recommendations for the field of application of one or another lining design have been given.

Protosenja A. G., Katerov A. M. Development of stress and strain state of combined support for a vertical shaft driven in salt massif. MIAB. Mining Inf. Anal. Bull. 2022;(6—1):100—113. [In Russ]. DOI: 10.25018/0236_1493_2022_61_0_100.

Katerov A. M., postgraduate student, https://orcid.org/0000-0002-8566-4724, St. Petersburg Mining University, 199106, St. Petersburg, line 21 V. O., 2, e-mail: andrey.katerov292@ gmail.com;
Protosenja A. G., Dr. Sci. (Eng.), Professor, https://orcid.org/0000-0001-7829-6743, St. Petersburg Mining University, 199106, St. Petersburg, 21-ya V. O., 2, e-mail: Protosenya_ 

Katerov Andrej Maksimovich, e-mail: andrey.katerov292@gmail.com.

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