Multiaxial creep of natural rock salt

Technical Report · Tue Dec 01 04:00:00 EST 1992

OSTI ID:10122598

Mellegard, K D; Callahan, G D; Senseny, P E ^[1]

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1. RE/SPEC, Inc., Rapid City, SD (United States)

Long-term multiaxial creep tests were performed on large, thin-walled cylinders of natural rock salt to investigate the relationship between the inelastic strain rate tensor and the stress tensor. The axial load, internal pressure, and external pressure on the specimens were controlled to obtain desired values of mean stress, octahedral shear stress, and Lode angle. The loads on the specimen were chosen so that the mean stress and octahedral shear stress were identical in nearly all tests, but that the Lode angle varied from 0{degree} to 30{degrees}. Test result show that for the thin-walled cylinder tests reported here, both strain-rate direction and strain-rate magnitude are better described by a Tresca-type flow rule than by a Mises-type flow rule. This conclusion is significant because use of a Tresca-type flow rule rather than a Mises-type flow rule produces much greater creep closures of underground openings in salt where the Lode angle deviates from 30{degrees} (triaxial compression).

• Research Organization: Sandia National Labs., Albuquerque, NM (United States); RE/SPEC, Inc., Rapid City, SD (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 10122598
• Report Number(s): SAND--91-7083; ON: DE93007421
• Country of Publication: United States
• Language: English

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