ABSTRACT
Based on the analysis of fields of the stresses component distribution, some patterns have been revealed of influence on the type of state of laminal rocks of the bottom, its structure and mechanical properties. Changing the rock state parameters generates development of its displacements in the direction of free surfaces, that is, into the cavity of mine working, which is of most interest in terms of assessing its stability. This chapter focuses on manifestations of heaving as a result of displacements development in depth and across the width of adjacent rock layers of in-seam working bottom. The roof rocks create an increased load in the sides of mine working, which the coal seam perceives as the hardest element, and transfers this load to the softer rocks of the bottom, which leads to the occurrence of extensive areas of limiting and their superlimiting state.
