Rock bolt certification tests in salt, Eddy County, New Mexico
One hundred rock bolts were installed and tested in the Kerr-McGee potash mine near Carlsbad, New Mexico. The bolts were installed in salt, then instrumented and loaded to failure. The failure modes for tensile tests were expansion shell slippage in salt or polyester resin slippage in salt. The failure modes for shear tests were a combination of bending and shearing or breaking of the bolts near the shear plate-salt interface. Safety factors are not included in the bolt loads in the report. Grade 75 (75,000 psi yield strength) rock bolts with 5/8- and 3/4-in. diameters were stressed into the yield region during tensile and shear tests with 1-3/8-in.-diam by 3-in. expansion shells. The theoretical yield load was 17,000 lb for 5/8-in. bolts and 25,000 lb for 3/4-in. bolts. One-inch-diameter bolts could not be adequately anchored with a single expansion shell to provide yielding. The average anchorage for all bolts moved 1.38 in. before reaching a maximum load of 27,000 lb. Grade 60 (60,000 psi yield strength) deformed reinforcing bar bolts, 1-in. diameter were stressed into the computed yield region approximately 47,000 lb during tensile tests. Yielding was accomplished with polyester resin anchorage when 2 or more resin cartridges (1-1/4 in. by 12 in.) were used. In shear tests, Grade 60 threaded rebar bolts, 1-in. diam, anchored with polyester resin, bent and broke at an average shear force of 34,200 lb with a displacement of 0.52 in.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (USA)
- DOE Contract Number:
- AC04-78AL05346
- OSTI ID:
- 6362089
- Report Number(s):
- WTSD-TME-3135; ON: DE86004307
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ROOF BOLTS
CERTIFICATION
PERFORMANCE TESTING
SHEAR PROPERTIES
TENSILE PROPERTIES
EXPERIMENTAL DATA
FAILURE MODE ANALYSIS
SALT DEPOSITS
WIPP
DATA
EQUIPMENT
FUNCTIONAL MODELS
GEOLOGIC DEPOSITS
INFORMATION
MECHANICAL PROPERTIES
MINING EQUIPMENT
NATIONAL ORGANIZATIONS
NUCLEAR FACILITIES
NUMERICAL DATA
PILOT PLANTS
RADIOACTIVE WASTE FACILITIES
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TESTING
UNDERGROUND FACILITIES
US DOE
US ORGANIZATIONS
052002* - Nuclear Fuels- Waste Disposal & Storage