Rock mass movements around development workings in various density of standing-and-roof-bolting support

Presented measurement results of roof rocks and wall rock movements of underground development workings after their drifting. The research was carried out in the coal mine workings with standing-and-roof bolting support. There were various density of the support, so the aim of the special monitoring programme was to determine movement intensity of rock mass in the premises of the heading area. There were four types of research did by the authors. They measured convergence, roof layers separation using telltales and sonic probes and load bearing of the headings’ roofs by hydraulic dynamometers. Evaluation of fracture zone around the heading and investigation the load zone caused by failed roof rocks may become a basement for the determination of support parameters of the workings. The combined system of standing support and roof bolting seems to be an essential for underground headings protection. Supported by the Ministry of Science and Higher Education Nr of Projects (4T12A00229)