Search U.S. government technical reports digitized or harvested by TRAIL.
Tunnel boring technology :disk cutter experiments in sedimentary and metamorphic rocks
Tunnel boring technology:disk cutter experiments in metamorphic and igneous rocks
Toward development of a hard-rock mining machine--drag cutter experiments in hard abrasive rocks
Large-scale laboratory drag cutter experiments in hard rock
A laboratory comparison of drag cutting methods in hard rock
Large-scale testing of the ripper fragmentation system
An investigation of crack propagation with a wedge indenter to improve rock fragmentation efficiency