Development of a borehole device to determine the modulus of rigidity of coal measure rocks.
NTIS: PB/209-548 Available for Reference At Bureau Libraries, 1971; :1-119
This report describes a simple borehole device to determine the modulus of rigidity (g) of rock, which was developed and successfully tested in the laboratory and in the field. The mathematical analysis required to interpret the results was also developed. In the laboratory tests very good agreement was observed between the known values of g and those determined experimentally for both metal and rock cylinders. Field testing was done at the Colorado School of Mines experimental mine at Idaho Springs, Colorado, and at the No. 4 Coal Mine of the Mid-Continent Coal and Coke Corp. near Carbondale, Colorado.
Mining; Coal mines; Boreholes; Rock mechanics; Analytical instruments; Laboratory testing; Mathematical models
CP; Final Contract Report
NTIS Accession No.
NTIS: PB/209-548; Available for Reference At Bureau Libraries
Colorado School of Mines