PSI - Issue 25

Mikhail Eremin / Procedia Structural Integrity 25 (2020) 465–469 Mikhail Eremin / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 2. A diagram of AE combined with the loading diagram of the sample with a porosity of ≈ 6% obtained by numerical modeling.

Fig. 3. Comparison of the modelling results with experimental data on UCS for more than 100 samples of porous sandstones of the Kuznetsk coal basin.

elsewhere Martin and Chandler (1994); Hoek and Martin (2014); Olkhovatenko (2014). Although the model overesti mates the strength of samples at porosity exceeding 15%. Misfit between numerical modelling and experimental data might be explained by the general complexity of a considered problem and also by a set of assumptions made: • sphericity of pores; • disregarding of all textural features but porosity. It can also be concluded that the model applied is applicable to an evaluation of threshold stresses which play a crucial role for solving specific engineering problems.