Peculiarities of passing through a temperature gradient in vertical shaft sinking with artificial ground freezing

The causes of brine breakouts in temperature gradients in vertical shaft sinking and construction with artificial ground freezing are analyzed. Aimed to prevent brine inrushes in shafts, it is proposed to obligatory perform grouting in such zones using improved and advanced techniques. The problem connected with water inrush accidents is mainly typical of potash and salt mines due to solubility of halite, sylvinite and carnallite rocks composing salt strata. The primary hazard in mining of such ore is the irreversibility of the mine flooding and, accordingly, the non-recoverability of the mineral loss. The groundwater inflows can affect a mining method so that only mining with underground dissolution of salt can be used instead of dry mining. For this reason, the salt mine construction technologies are extremely particular about safety of operations and protection from inflows of water. Accidents connected with water breakouts take place in different phases of mining, including accessing. A common method of protection of openings in vertical sinking across aquifers when accessing salt deposits is freezing of enclosing rock mass. History of the artificial ground freezing method shows that the most frequent accidents take place at the interface of frozen and non-frozen rocks, which means that the work technique in this zone requires special analysis and prediction.

Aparin A. G., Sankovsky A. A. Peculiarities of passing through a temperature gradient in vertical shaft sinking with artificial ground freezing. MIAB. Mining Inf. Anal. Bull. 2022;(2):51-61. [In Russ]. DOI: 10.25018/0236_1493_2022_2_0_51.

A.G. Aparin¹, Graduate Student,
A.A. Sankovsky¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: alekseyap@icloud.com,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

A.G. Aparin, e-mail: alekseyap@icloud.com.

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