ABSTRACT
Subsequent experiments confirmed this effect, but it can also be explained by alternative hypothesis: decreasing the displacements before the point where B/D ≤ 0.57 is originated by a more powerful (rigid) support installed in the vicinity of the center of junction. Zaslavskiy’s shaft measurements were conducted at coal mining openings for depths 500-1000 m for conditions of relatively rigid support for the base opening and yielding support for adjacent opening. This fact explains relatively low values of the coefficient fjU (maximum is fjU = 1.43).
