Research and Analysis of the Stress State of the Load-Bearing Elements in the Preparatory Mine Working “Massive – Frame – Combined Roof-Bolting System”

Analysis of the stresses intensity curve in the massif surrounding mine working, with the use of a combined roof-bolting system instead of the basic scheme has shown a number of changes in the state of adjacent rocks. The armored and rock plate, formed in the roof, has an expanded area of bearing on the rocks in the sides of mine working. This is evidenced by the almost uniform stresses field s_x with the exception of local areas of border rocks to width of up to 0.8 m. In both of the considered fastening structures, the cap board of the frame is in a relatively unloaded state, but there are differences in both the degree of unloading and the nature of s_y distribution along the length of the cap board and in its cross section. The minimal loading of the cap board with rock pressure from the side of rocks is observed when setting a combined roof-bolting system in it.