Search U.S. government technical reports digitized or harvested by TRAIL.
Prediction of penetration rate for percussive drilling
Drillability studies :percussive drilling in the field
Tunneling machine research :development of an experimental full-scale research rock cutting device
Tunneling machine research :interaction between disk-cutter grooves in rocks
Tunneling machine research :size distribution of rock fragments produced by rolling disk cutters
Correlation of laboratory cutting data with tunnel boring machine performance