NIOSHTIC-2 Publications Search
Drill-split mining with radial-axial loading splitters.
Rock Mechanics: Contributions and Challenges: Proceedings of the 31st U.S. Symposium, June 18-20, 1990, Colorado School of Mines, Golden, Colorado. Hustrulid WA, Johnson GA, eds., Brookfield, VT: A.A. Balkema, 1990 Jan; :511-518
A mechanical excavation tool, designed to supplement or supplant drill-blast methods of primary excavation, has been developed and successfully laboratory-tested by the U.S. Bureau of Mines. The tool, called a radial-axial loading splitting tool (RASP), is as versatile in its application as drill-blast excavation methods, providing it with great potential while eliminating explosives and their associated hazards from the working environment. Alternatives to drill-blast excavation methods have in the past been limited in their applications or success. Most mechanical excavation alternatives come in the form of cutting machines. Those capable of excavating hard rock, primarily tunneling machines, are limited by their need to react their cutting forces through frictional contact with the tunnel's periphery. This restricts the size and shape of the openings they can produce and the maneuverability of the machine itself. Mechanical excavators capable of more flexible operation, such as roadheaders and modified continuous miners, are limited in their application to soft rock. All of these machines are massive, complicated, and expensive. The RASP offers distinct advantages over other mechanical excavation machines by reacting its excavation forces internally, by being scalable in size and capability, by having the capacity to excavate most rocks, and by being low in cost.
Rock-mechanics; Mining-equipment; Machine-tools; Excavation-equipment; Blasting-agents; Equipment-design; Mechanical-properties; Cutting-tools; Tools; Tunneling
OP; Conference/Symposia Proceedings
Rock Mechanics: Contributions and Challenges: Proceedings of the 31st U.S. Symposium, June 18-20, 1990, Colorado School of Mines, Golden, Colorado
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division