VNII Galurgy Stock Co., St. Petersburg, Russia:
I. P. Mustel, Divisional Manager, gusev@galurgy.spb.ru
T. K. Shlendova, Senior Researcher

This work considers changes in hydrogeological conditions under emergency deformation of the undermined rock massif at Berezniki-1 mine in the time of flooding the mine, forming of sinks on the earth surface and subsequent restoring of equilibrium state in geological environment. Peculiarities in changing of hydrodynamical and hydrochemical modes of underground waters have been investigated. It is shown that prior to forming the sink only brines from the lower aquifer were entering into the mine in the course of nine months. The sink (caving) connected all suprasalt aquifers which resulted in quick filling of mined-out space with freshened brines. In the process of flooding of mine workings a depression funnel embracing virtually all aquifers was formed and was observed lowering of mineralization in underground waters. After restoring of drained water in the area of sinks' forming in the upper aquifers there is observed a total rise in the level of underground water and salinization with natural brines which testifies about ascending travel of water along the channels of sinks and zones of technogenic jointing and about the absence of fresh water inflow to saline rocks. Heightened concentration of hydrocarbonates is observed in water. At present no substantial changes in the condition (mode) of underground waters occurs. Head-capacity characteristics of suprasalt waters and mine brines exclude their mutual crossflows. It concludes that before water break into the mine workings their arrival can be detected only by hydrochemical performances of mine brine occurrence monitoring. Periods of hidden income suprasalt entrance to the mine can be significant. Their genetic identification is complicated by the small volume, composition, depending on the migration time and the structure of the waterproof formation, as well as mixing with miner brines of different origin. The development and execution of engineering activities on localization and repayment of hazardous mine brine occurences most likely and feasible in the initial period of existence of the latter.

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