Determination of rock mass deformation modulus in closely jointed Columbia River basalt
The basalts delineated for the repository feasibility study are located on the Hanford Site in southeastern Washington. One of the rock properties of interest is the deformation modulus. In order to properly apply a deformation modulus value to construction design or numerical models, it is necessary to understand the range of value the modulus can exhibit. The modulus values can vary as functions of sample size, stress level, location, and orientation. No single test method allows an evaluation of all these variables, so several different types of modulus tests must be performed. The three types of tests discussed are: laboratory testing of recovered core; borehole jacking tests using the Goodman Jack; and borehole deformation measurements during a flat jack test. The following conclusions can be inferred from data collected in tests in the closely jointed Pomona basalt: deformation modulus decreases with increasing specimen size; laboratory tests indicate a deformation modulus of approximately 87 gigapascals; borehole deformation measurements in a flatjack test indicate a deformation modulus of approximately 40 gigapascals; borehole jacking test with a Goodman Jack indicate a deformation modulus of approximately 20 gigapascals; and there is no significant temperature effect on modulus values (up to 100/sup 0/C).
- Research Organization:
- Rockwell International Corp., Richland, WA (USA). Rockwell Hanford Operations
- DOE Contract Number:
- AC06-77RL01030
- OSTI ID:
- 6792841
- Report Number(s):
- RHO-BW-SA-229P; CONF-820964-4; ON: DE82021719
- Country of Publication:
- United States
- Language:
- English
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Measurement of rock-mass deformation properties by the borehole jacking method at the near-surface test facility
Measurement of rock mass deformation properties by the borehole jacking method at the near-surface test facility
Related Subjects
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BASALT
COLUMBIA RIVER BASIN
DATA
DEFORMATION
EXPERIMENTAL DATA
GEOLOGIC DEPOSITS
HIGH-LEVEL RADIOACTIVE WASTES
IGNEOUS ROCKS
INFORMATION
MANAGEMENT
MATERIALS
MECHANICS
NUMERICAL DATA
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTES
ROCK MECHANICS
ROCKS
UNDERGROUND DISPOSAL
VOLCANIC ROCKS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES