Span Design for Entry-Type Excavations in Burst Prone Ground
CIM Vancouver 2002
Pravin Kumar, Pierre Rocque, Grant Corey,
Underground entry-type excavations in burst prone ground requires a higher factor of safety than do non-entry excavations. A review is made of underground excavation span design techniques and conditions under which they can be applied. A design procedure specific to conditions found in entry-type mining in burst prone ground is proposed. At the center of the procedure is an empirical span design chart, called the “RMR versus Span in Burst Prone Ground”, which will provides a practical tool for mining engineers to design entry type excavation in burst prone ground. The development of this chart and its use as a design tool is a result of 150 stope studies done at the Red Lake Mine.