PSI - Issue 32

I S Lomakin et al. / Procedia Structural Integrity 32 (2021) 117–123 I S Lomakin, A A Tsayukov / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 2. Distribution of parameter ∗ for each pillar variant. The parametric support was based on the representative physical and mechanical tests of the salt rocks and determination of the properties of clay interlayers (Barakh et al. 2008). Fig. 2, for each interchamber pillar variant, demonstrates the correspondence between the loading degree C calculated according to the regulations and the parameter determined as a result of the geomechanical calculations. The distribution of parameter ∗ in case of the formation of a generalized two-layer chamber block for both variants of the calculations is shown in Fig. 3. Let us note that in this case, an increase of ∗ values occurs, which is due to the mutual influence of the formed goaf in both the production layer at the interlayer thickness of 3.9 m. For example, the value of parameter ∗ ൌ ͲǤ͵ͺͳ in the lower productive layer increases to ͲǤͶͲ͵ in the first calculation variant (Fig. 3, a) and it reaches ͲǤͶͳ͸ in the second one (Fig. 3, b).

Fig. 3. Distribution of parameter ∗ for the first ( a ) and second ( b ) computational variant.