Coal mine roof rating (CMRR), rock mass rating (RMR) and strata control: Carborough Downs Mine, Bowen Basin, Australia

• DOI: 10.1016/j.ijmst.2020.01.003
• Publication Date: 2020-01-16T13:25:05Z
• Authors: Martin Brook; Bruce Hebblewhite; Rudrajit Mitra
• Keywords: Rock mass rating; Coal measures

The rock mass rating (RMR) has been used across the geotechnical industry for half a century. In contrast, coal mine roof (CMRR) was specifically introduced to underground mines two decades ago link geological characterization with risk mitigation. premise of CMRR is that strength properties are influenced by defects typical measures stratigraphy. in longwall pillar design, support methods, and evaluation extended cuts, but rarely evaluated. Here, RMR applied mine. Roof classifications were undertaken at 67 locations Both showed marked spatial variability terms conditions. Normal reverse faulting occur mine, while no clear relationships exist between character faulting, central graben zone heterogeneous properties, divergence RMR. Overall, data fell within broad envelope results reported cuts Australian U.S. mines. corollary useful, should not be isolation, rather as component strata control programme.