Conclusions
1. In compacted dry and slightly moist sands and clays of different gradiation, density, and moisture content, the change in the density of the IR-radiation flux is proportional to the change in the sum of the three principal normal stresses in the specimen.
2. The thermoactivity coefficient of sand depends heavily on its initial density and moisture content, while the difference in the gradation does not affect this coefficient in our investigations.
3. For compacted sands subjected to unloading, hysteresis is virtually absent on the curve denoting the change in the density of the IR-radiation flux versus the change in the indicated invariant of the stress tensor.
4. The method of evaluating the stressed state of soil on the basis of the ΔW level makes it possible to perform noncontact and remote measurements; it can therefore be used to monitor the state of a soil subjected to variable and quasistatic loads.
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Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 1, pp. 24–26, January–February, 1989.
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Motovilov, É.A., Smorodinov, M.I., Sheinin, V.I. et al. Estimating the stressed state of soils from measurement of infrared radiation flux. Soil Mech Found Eng 26, 26–30 (1989). https://doi.org/10.1007/BF02306233
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DOI: https://doi.org/10.1007/BF02306233