The Application of Models to Geotechnology

Thermally Conductive Cementitious Grouts for Geothermal Heat Pumps. Progress Report by 1998

“…The initial velocity of 4.14 * 0.09 lcds in the saturated condition falls within the range of 3.5 to 4.2 km/s for saturated mortar (Neville, 1996). The P-wave velocities in different rocks ranges fi-om 1.4 to 6.5 Im./s depending on type (Roberts, 1977). The acoustic impedance of Mix 111 also depends on moisture content and was measured to be 8.84x 10G* 3.2 x 105 kg/m2s after wet curing for 28 days.…”

Rock Mechanics for underground mining

“…In the past, considerable use was made of photoelastic plugs and discs to monitor stress changes in the rock surrounding excavations and in support elements. Details of several of these photoelastic instruments are given by Roberts (1977).…”

“…These have included photoelastic plugs and discs described by Roberts (1977), instruments based on the hydraulic pressure cell described by Sauer and Sharma (1977), the vibrating wire stress meter Hooker, 1974, Sellers, 1977), and rigid inclusion instruments which use electric resistance strain gauges to measure the strains induced in the plug (Wilson, 1961, Worotnicki et al, 1980. These are usually borehole instruments and suffer from the disadvantage that they monitor the stress change in one direction only.…”

Thermally conductive cementitious grouts for geothermal heat pumps. Progress report FY 1998

“…The initial velocity of 4.14 k 0.09 km/s in the saturated condition falls within the range of 3.5 to 4.2 km/s for saturated mortar (Neville, 1996). The P-wave velocities in different rocks ranges from 1.4 to 6.5 km/s depending on type (Roberts, 1977). The acoustic impedance of Mix 1 1 1 also depends on moisture content and was measured to be 8.84 x lo6 f 3.2 x lo5 kg/m2s after wet curing for 28 days.…”