ULTRASONIC WAVE PROPAGATION IN DISCONTINUOUS ROCK
Experiments were carried out to determine the effect of discontinuities on the propagation of ultrasonic waves in samples of chalk and sandstone obtained from tunnel sites at Chinnor, Oxfordshire and Warrington, Cheshire respectively. In particular the effect of normal stress across a closed discontinuity was investigated. Tests to determine the wave velocity, attenuation coefficients and the effect of uniaxial compressive stress in intact samples of the rocks are also described. A brief review of work in this field is included and comparisons are made with results obtained by other workers. The 'pundit' ultrasonic velocity measuring equipment was used for the experimental work and performed well in the laboratory and under difficult conditions on site. Conclusions are drawn on the specific and broad implications of the work respectively for seismic probing ahead at ultrasonic frequencies and on ultrasonic evaluation of rock quality in a tunnelling context.(a) /TRRL/
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Corporate Authors:
Transport and Road Research Laboratory (TRRL)
Wokingham, Berkshire United Kingdom -
Authors:
- NEW, B M
- Publication Date: 1976
Language
- English
Media Info
- Features: Figures; Photos; References;
- Pagination: 19 p.
Subject/Index Terms
- TRT Terms: Chalks; Discrete systems; Rocks; Sandstones; Seismicity; Stress (Psychology); Stresses; Tunneling; Tunnels; Ultrasonics; Wave motion; Waves
- Uncontrolled Terms: Discontinuity; Discontinuous; Seismic investigations
- Old TRIS Terms: Normal stress
- ITRD Terms: 4120: Chalk; 9015: Discontinuous; 4154: Rock; 4104: Sandstone; 5731: Seismic; 5575: Stress (in material); 3374: Tunnel; 6739: Ultrasonic; 6767: Wave
- Subject Areas: Bridges and other structures; Geotechnology; Highways; I43: Rock Mechanics;
Filing Info
- Accession Number: 00148038
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- Report/Paper Numbers: Lab. Rpt. 720
- Files: ITRD, TRIS
- Created Date: Apr 27 1977 12:00AM