Conclusions
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1.
As a result of the investigations performed, the need for a complex approach to the study of thermal effects in rock is well founded, an approach which would permit the establishment of optimal regimes for thermal action for maximum strengthening of a rock mass.
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2.
The maximum strengthening effect at T=550°C is attained without altering the crystal structure and is caused by the partial sintering of the particles because of a decrease in pore space, due to the removal of free and physically bound water as well as to the uniform grain size, i.e., the presence of a large amount of a finely dispersed clay fraction (38–77%).
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3.
With thermal effects, the structural and textural features of the rocks must be considered, which will permit the determination of the expediency of their use in strengthening a rock mass.
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Literature Cited
A. V. Ralko, V. S. Gorodov, Yu. D. Zin'ko, and I. A. Kravtsov, Thermodynamic and Thermographic Studies of Heating Processes in Ceramics [in Russian], Vishcha Shkola, Kiev (1980).
V. P. Ivanova, B. K. Kasatov, T. N. Krasavina, and E. L. Rozinova, Thermal Analysis of Rocks and Minerals [in Russian], Nedra, Leningrad (1974).
B. M. Gumenskii, Principles of Physical Chemistry of Clay Soils and Their Use in Construction [in Russian], Stroiizdat, Leningrad, Moscow (1965).
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 38–42, September–October, 1984.
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Shapar', A.G., Krasnopol'skii, I.A. & Khobotova, L.N. Patterns in the thermal stability of soils. Soviet Mining Science 20, 371–374 (1984). https://doi.org/10.1007/BF02498886
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DOI: https://doi.org/10.1007/BF02498886