Results of studies in which measurements of infrared radiation from the surface of geomaterialsTime variation of stresses in massifs of grounds and rocks is a characteristic manifestation of the activity of mechanical processes occurring in them. Detection of these variations and determination of their magnitudes can be used to assess the influence of different effects on the state of massifs and to detect and predict the development of hazardous natural and technological processes [1, 2]. Grounds, especially soft, are the most complicated type of geomaterials from the point of view of experimental analysis of their mechanical state [3][4][5]. Over the last years, considerable attention has been given to the use of different physical methods for geomonitoring [6, 7], mostly as applied to rocks and concrete. The present studies [8, 9] seek to develop and improve the technique of monitoring stress variations in geomaterials, which is also applicable in massifs of grounds. The technique uses the thermodynamic effect of variation in the temperature of a body upon its deformation [10] and the dependence of the infrared (IR) radiation flux from the surface on the temperature of the body [11, 12].In elastic deformation in the adiabatic regime, the temperature variations AT and the first invariant of the stress tensor All at a point of the medium are connected by the relation [10]where To is the initial temperature of the body [K], and the quantity Am [1/Pal, which is conveniently called the coefficient of thermoelastic-activity coefficient [8], depends on the density and thermal properties of the material. Adiabaticity, i.e., the absence of heat exchange between a deformable body and the ambient medium and also between different segments of the body, is apparently only approximate under real conditions. However, this approximation is quite adequate if the rate of change in temperature with time is much higher due to the thermoelastic effect than due to heat exchange. Such quasiadiabaticity occurs, for example, in standard regimes of tests of geomaterial samples [8].
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