ABSTRACT
Prop, composite and frame supports are traditionally used in boards for support reinforcement. Anchor support has following advantages over them:
– low costs and steel intensity; – low labour intensity during transportation and
installation; – doesn’t prohibit people and equipment transpor-
tation; – doesn’t require additional installation of the sup-
port during equipment installation in the working. That is why the most reasonable choice for stable
state provision of workings and their face-ends during the whole exploitation period is to use two-level scheme of anchor bolting with not only 3 m. anchor bolts (I level) but also deep-level anchor bolts (II level). The second level anchor bolts are fastened in stable roof rocks outside the arch of natural cavity with account of weakness and deformation of working sides (Figure 1). Unstable roof rocks are bound by the first level anchor bolts and “hooked” on the anchor bolts of the second level to the stable roof rocks outside the arch of natural cavity.
