Issue 49

A. Baryakh et alii, Frattura ed Integrità Strutturale, 49 (2019) 257-266; DOI: 10.3221/IGF-ESIS.49.25 264 As an example problem, we consider the Upper Kama salt deposit Russia, Perm Krai, which is a layered rock mass mined out by the room-and-pillar method. A computational scheme of the problem with account of symmetry about the y axis is given in Fig. 3. The characteristics of the geological section and the mechanical properties of the examined layers are presented in Tab. 2. Figure 3 : The computational scheme of multilayers system №. Bed, stratum Thickness of layer, m Modulus of deformation E, GPa Poisson's ratio  Specific weight 3 , / КН м  1 Q 9.1 0.10 0.30 20 2 PTs 18.3 0.70 0.30 23 3 TKT 50.0 1.20 0.30 24 4 SMT 48.0 0.30 0.40 22 5 PP - 0.80 0.30 22 6 PKS 20.0 1.20 0.30 22 7 K, I-K 5.6 0.94 0.31 21.8 8 I, Z-I 5.7 0.91 0.31 21.7 9 Z, ZH-Z 5.1 0.89 0.31 21.6 10 ZH, E- ZH 3.7 0.92 0.31 21.7 11 E 10.7 0.50 0.35 20 12 D-E 4.0 1.0 0.30 22 13 D 13.0 0.50 0.35 20 14 G-D 3.0 1.0 0.30 22 15 G 13.0 0.50 0.35 20 16 V-G 5. 1.0 0.30 22 17 V 10.0 0.60 0.30 22 18 B-V 4.5 1.0 0.30 22 Table 2 : Physical and mechanical properties of rocks