Determination of water conducting fracture zone for mining and geological conditions of the Verkhnekamsk salt deposit

From the analysis of survey materials of mine excavations, a geomechanical scheme for the formation of technogenic water-conducting fractures in salt formations having clay interlayers with a thickness of 0.005-0.05 m. was obtained. According to this scheme, bending of salt formations occurs with the formation of normally dissecting cracks, and the bend of clay interlayers, due to pronounced plastic properties, occurs without the formation of cracks in them. Such deformation of clay interlayers, at certain values of curvature, retains the waterproof properties of salt formations even under conditions of formation of through cracks in them. A predictive scheme for determining the height of the zone of water-conducting cracks is given. The influence of clay formations on the parameters of the development of technogenic water-conducting cracks is taken into account along the influence of the rheological properties of salt formations and the layered structure of the underburden on the development parameters of the fracture zone.