IN SITUR REKA PROBE MEASUREMENTS AT FRAN RIDGE AND IN THE ESF Page: 1 of 8
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In Situ REKA Probe Measurements at Fran Ridge and in the ESF
George Danko, Harry Creech, John Phillips, and Sai Tippabhatla
Mackay School of Mines
University of Nevada, Reno
A thermal probe method, called REKA (Rapid Evaluation of K and Alpha)
has been used for determining thermal conductivity (K) and diffusivity (Alpha) at
both the Large Heated Block Tests and in the ESF. The REKA method involves a
single borehole probe with a heater and temperature measurement section. An
elliptical temperature field is generated by the heater, and the temperature
distribution along the length of the probe is recorded at several locations and at
given time intervals for a period of 6 to 24 hours. A trial-and-error evaluation
procedure is used to determine the unknown thermophysical properties by
minimizing the RMS error between the measured and calculated temperature
fields. If a conduction-only thermal model is used in the evaluation, the
thermophysical properties will include the rockmass and the moisture effects, and
the values will represent effective properties. If a hydrothermal model is also used,
the difference between the effective and the rock matrix thermophysical properties
can be related to hydrothermal characteristics. A reusable REKA probe can be
applied to measure in situ rock properties in a short, open hole, e.g., in a rockbolt
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GEORGE DANKO, HARRY CREECH, JOHN PHILLIPS, AND SAI TIPPABHATLA. IN SITUR REKA PROBE MEASUREMENTS AT FRAN RIDGE AND IN THE ESF, report, November 14, 1997; Las Vegas, Nevada. (digital.library.unt.edu/ark:/67531/metadc717860/m1/1/: accessed January 15, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.