Rapid Measurement of the Thermal Resistivity of Soil [includes discussion]
- 1 August 1952
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems
- Vol. 71 (3) , 570-577
- https://doi.org/10.1109/aieepas.1952.4498511
Abstract
Following a method due originally to Stalhane and Pyk,1 the thermal resistivity of soil may be measured in situ by thrusting a long heated needle into the ground to the required depth and measuring its temperature every 30 seconds for 15 to 30 minutes. The slope of the resulting temperature versus time curve on semilog paper is proportional to the thermal resistivity of the soil, and the constant of proportionality is derivable theoretically. The finite diameter of the needle is taken into account by adjusting the zero time to a value found by plotting dt/d¿ against t. The effects of the finite length of the needle are difficult to assess but appear to be unimportant for the duration of a typical determination. Resistivity values obtained agree with those obtained by the steady-state method. A crew of three can make determinations at the rate of one to three per hour.Keywords
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