Cross-hole acoustic surveying in basalt
The purpose of this Technical Note is to present preliminary results of a series of cross-hole acoustic measurements performed in a tunnel situated in a basaltic rock mass. The tunnel, as a sub-surface depth of 46 m, was excavated by conventional drill-and-blast techniques. Located well above the water table, the rock mass is characterized as dense basalt with a jointing structure of 0.15-0.36 m thick vertical columns cut by low-angle cross joints. The objectives of the test program were: first, to evaluate in situ dynamic elastic properties, and to assess their spatial variation around the opening; second, to evaluate the extent of blast damage around the opening; and third, to assess the spatial variation of jointing and fracturing around the opening. Analysis of the velocities and frequency spectra of compressional and shear waves transmitted through the rock. 10 references.
- Research Organization:
- Lawrence Berkeley Lab., CA
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6846170
- Journal Information:
- Int. J. Rock Mech. Min. Sci. Geomech. Abstr.; (United States), Journal Name: Int. J. Rock Mech. Min. Sci. Geomech. Abstr.; (United States) Vol. 21:4; ISSN IRMGB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Analysis of cross-hole seismic measurements in columnar-jointed basalt
Experimental studies of elastic-wave propagation in a columnar-jointed rock mass
Related Subjects
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ACOUSTIC MONITORING
BASALT
BLAST EFFECTS
COMMINUTION
DISTRIBUTION
DRILLING
ELASTICITY
EXPLOSIVE FRACTURING
FAILURES
FRACTURES
FRACTURING
IGNEOUS ROCKS
MECHANICAL PROPERTIES
MONITORING
ROCK DRILLING
ROCKS
SPATIAL DISTRIBUTION
STRESS ANALYSIS
TENSILE PROPERTIES
TUNNELS
UNDERGROUND FACILITIES
VOLCANIC ROCKS