Water-resistant rocks

WATER-RESISTANT ROCKS (EN: water resisting rock; DE: wasserbestandige Gesteine; FR: roches impermeables, roches hydrofuges; ES: rocas impermeables; RU: водоупорные горные породы) are the rocks, which are not allowing to pass (or almost not allowing to pass) the free water in case of the natural pressure gradients. The water-resistant rocks (clays, non-cracked limestones and massive-crystalline rocks, argillaceous shales, crystalline schists, and so on) within the geological cross-section form the water-resistant roof, which is overlying the underlying aquifer, or they form the water-resistant bed, which is underlying this aquifer (the shielding properties of the water-resistant rocks decrease at the high temperatures and increased mineralization). During the conducting of the mining works, it is necessary to take into account the thickness, lithologic composition, crackedness, and properties of the water-resistant rocks, and also their situation relatively to the mine workings. For example, in case of the deformation of the stratum of the water-resistant rocks, or in case of the small thickness of this stratum within the roof or soil of the mine working, there emerge the sudden breakthroughs of the waters or quick clays.