Test plan for suitability assessment of five overcoring stress measurement techniques
Tests are to be conducted at the Near-Surface Test Facility (NSTF) to assess the suitability of five overcoring techniques for in situ stress determination in a jointed basalt. The overcoring methods to be investigated use the following instrumentation to measure strain relief by overcoring a pilot borehole: USBM borehole deformation gage, CSIRO hollow inclusion stress cell, cast epoxy inclusion, the Lulea triaxial strain cell and the doorstopper'' biaxial strain cell. The tests are to provide data regarding the state of stress below the NSTF. This information is to be used in the evaluation of each method of overcoring. During the course of field testing, an attempt is to be made to adapt conventional overcoring techniques and analytical methods to the basalt medium. If overcoring stress determination in basalt is shown suitable, then additional studies will be identified to further adapt a technique for use at depth. In addition to the five overcoring techniques to be tested at the NSTF, stress measurements by Hydrofracturing are to be conducted to provide data for direct comparison with overcoring results. 16 refs., 18 figs.
- Research Organization:
- Rockwell International Corp., Richland, WA (USA). Rockwell Hanford Operations
- Sponsoring Organization:
- DOE/RW
- DOE Contract Number:
- AC06-77RL01030
- OSTI ID:
- 5201496
- Report Number(s):
- RHO-BWI-TP-015; ON: TI90005871; TRN: 90-004524
- Country of Publication:
- United States
- Language:
- English
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An assessment of the suitability of five overcoring techniques for stress determination in a jointed basalt
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11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
BOREHOLES
STRAINS
HIGH-LEVEL RADIOACTIVE WASTES
UNDERGROUND DISPOSAL
BASALT
COMPILED DATA
HANFORD RESERVATION
HYDRAULIC FRACTURING
RADIOACTIVE WASTE MANAGEMENT
TESTING
CAVITIES
COMMINUTION
DATA
FRACTURING
IGNEOUS ROCKS
INFORMATION
MANAGEMENT
MATERIALS
NATIONAL ORGANIZATIONS
NUMERICAL DATA
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
ROCKS
US DOE
US ERDA
US ORGANIZATIONS
VOLCANIC ROCKS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage
053000 - Nuclear Fuels- Environmental Aspects