ABSTRACT
The development of a technique is implemented in two main directions: detailing the structure of bottom rocks adjacent to the coal seam and specifying the range of changes in the calculated compressive resistance of rocks layers, depending on the intensity of action of their weakening factors. Both directions are conditioned by the revealed three diagrams of the heaving development depending on the structure and properties of rocks of the immediate bottom and adjacent main bottom. The geological survey data testify that only three lithological varieties occur in the bottom of the seams: argillite, siltstone and sandstone. The “Schemes II and III of heaving development” provide for the occurrence of sandstone in the second rock layer, which either maintains continuity, or a thrust system of rock blocks is formed in it. Therefore, the second rock layer has an increased value of the calculated resistance to compression, which is most expedient to reflect with two values of 30 and 50 MPa.
