New methods and technical solutions are developed to stimulate degassing of coal seams based on fixed bridges and to form impermeable protective screens in the vicinity of underground workings. The features of applying local hydraulic fracturing method to measure effective stresses acting in rock mass are investigated. Prototypes of devices for the equipment transportation along the horizontal section of an in-seam hole and implementation of transverse hydraulic fracturing under tangential load applied near the isolated interval are created.
