Features of the thermally stressed state of a rock mass with flame-jet drilling taking account of thermal changes in its physical properties
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A detailed calculation has been carried out for the thermal and stressed-strained state of a solid mass, in particular rock, for temperature dependences of only thermal conductivity coefficient λ(θ), thermal expansion coefficient, α(θ), and Young's modulus E(θ), and also with combined dependence of them. Comparison of these calculations with the case of constant values λ0, α0, Eo  showed that the latter appear to be very close to the most accurate calculation with λ(θ), α(θ), E(θ). Consideration of the dependence on temperature alone for individual properties may lead to more serious deviations.
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