Gage inclusion experiments

Conference · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5334629

Smith, C. W.

To make field measurements of the free-field radial stress, we typically drill holes in the host rock and couple the gages to the rock with a grout material. Usually there is a mismatch of the mechanical properties of gage, installation grout, and host rock. The mismatch may produce peak values that are different from the free-field values and distort the waveshapes. This is the gage inclusion problem. To investigate this effect and provide data for comparison with modeling calculations, we have fielded pairs of gages in which the gage package or the installation technique differed between the pairs. Experiments were conducted in four environments: wet tunnel bed tuff, a block of DSRM2 grout, Yuma soil, and partially saturated tuff. Data suggest that: (1) at stresses below one kilobar in wet tuff, specific gage types will show peak amplitudes of 65 to 70% of the peaks, and reduced impulses, shown by other gage types, (2) there are negligible inclusion effects at the two kilobar level in DSRM2 grout, (3) a gage package with a wave transit time longer than the risetime of the incident stress wave may overregister and distort the waveshape, and (4) geometry effects -- a hole versus a slot -- can generate different peak values. 5 refs., 15 figs., 2 tabs.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5334629
• Report Number(s): SAND-89-0994C; CONF-8909163-10; ON: DE90003576
• Resource Relation: Conference: 5. symposium on containment of underground nuclear detonations, Santa Barbara, CA (USA), 19-21 Sep 1989
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
RADIOACTIVE WASTE DISPOSAL
RESEARCH PROGRAMS
ROCK MECHANICS
MEASURING METHODS
COMPUTERIZED SIMULATION
DRILLING
GROUTING
HIGH-LEVEL RADIOACTIVE WASTES
IMPACT SHOCK
MECHANICAL PROPERTIES
PACKAGING
RADIOACTIVE WASTE MANAGEMENT
SHIELDING
SOILS
STRAIN GAGES
STRESS ANALYSIS
TUFF
TUNNELS
YTTERBIUM
ELEMENTS
MANAGEMENT
MATERIALS
MEASURING INSTRUMENTS
MECHANICS
METALS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
RARE EARTHS
SIMULATION
UNDERGROUND FACILITIES
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage
990200 - Mathematics & Computers