Substantiation of cable bolts parameters for supporting mine workings in conditions of laminated rocks

Purpose. The development of approaches to the substantiation of the cable bolts installation parameters for the mine workings supporting in conditions of laminated rocks, taking into account the geometric parameters of the rocks disintegration zone.
Methods. The parameters of the rocks disintegration zone in the roof of a single mine working and a mine working in the area of a longwall influence are determined by the in-situ investigations.
Findings. The existing approaches to the cable bolt installation parameters are considered. The rock deformation mechanism around a single mine working is introduced. The results of the experimental supporting of mine working
with roof bolts in conditions of Western Donbass are analyzed. The results of studying of rock mass deformation in the roof of the gateroad in the area of longwall influence are presented.
Originality. The deformation of the rock mass around a single mine working occurs in the form of extrusion wedges of laminated rocks in the roof and floor. Behind longwall face the zone of rocks disintegration formed at a height of 6 m in the roof and the overlying strata sagged by up to 0.2 m without delaminating.
Practical implications. Taking into account the geometric parameters of the rocks disintegration zones the installation parameter of cable bolts for the mine working roof supporting are substantiated. Experiments proved that the increasing of the cable bolt installation density reduces the intensity of the gateroad roof rock deformation at the face – end.