Support system design for shaft junctions in creeping rocks

The article presents the comparison of the shaft support designs obtained analytically and numerically, and offers a justification of the computational method for shaft sinking in creeping rocks. The source data required for the correct calculation for the preset conditions are presented. The application ranges of the computational method are defined in two and three dimensions. Within the design model selection, the shaft support strength estimates are obtained from the finite element modeling and analytical solution. The finite element model which has the highest agreement with the analytical solution data is picked up. The essential conditions to be included in the support system design are specified, namely, viscoelastic deformation of rocks, lag of the permanent support behind the shaft foot during sinking (if any), initial stress field. The natural stress field, strains and loads on the support at shaft junctions with mine tunnels during sinking and at the end of the shaft service life are analyzed. The nonconformance of stiffnesses of the shaft support and the shaft junction support leads to higher loading of the shaft support but has a beneficial effect on the stress–strain behavior of the shaft junction support at the end of the shaft service life.

Kirienko Y. A. Support system design for shaft junctions in creeping rocks. MIAB. Mining Inf. Anal. Bull. 2021;(8):142-153. [In Russ]. DOI: 10.25018/0236_1493_2021_8_0_142.

Y.A. Kirienko, Graduate Student, Information Technology Department, National University of Science and Technology «MISiS», 119049, Moscow, Russia, e-mail: 9267810740@mail.ru

1. Walton G., Kim E., Sinha S., Sturgis G., Berberick D. Investigation of shaft stability and anisotropicdeformation in a deep shaft in Idaho, United States. International Journal of Rock Mechanics and Minings Sciences. 2018, vol. 105, pp. 160–171.

2. Xiaoming Sun, Gan Li, Chengwei Zhao, Yangyang Liu, Chengyu Miao Investigation of deep mine shaft stability in alternating hard and soft rock strata using three-dimensional numerical modeling. Processes. 2018, vol. 7, no 1. DOI: 10.3390/pr7010002.

3. Cheng Y. M., Wong H., Leo C. J., Lau C. K. Stability of geotechnical structures. Teoretical and numerical analysis. Bentham Science Publishers, 2016. 395 р.

4. Kazikaev D. M., Sergeev S. V. Diagnostika i monitoring napryazhennogo sostoyaniya krepi vertikal'nykh stvolov [Diagnostics and monitoring of the stress state of vertical shaft support], Moscow, Izd-vo «Gornaya kniga», 2011, 244 p.

5. Kazikaev D. M., Sergeev S. V. Features of the deformation of the lining of shafts and junctions in difficult mining and geological conditions. MIAB. Mining Inf. Anal. Bull. 2013, no. 3, pp. 26–32. [In Russ].

6. Bulychev N. S. Fotieva N. N. Strel'tsov E. V. Proektirovanie i raschet krepi kapital'nykh vyrabotok [Design and calculation of support for permanent workings], Moscow, Nedra, 1986, 288 p.

7. Bulychev N. S. Mekhanika podzemnykh sooruzheniy [Mechanics of underground constructions], Moscow, Nedra, 1994, 278 p.

8. Rukovodstvo po proektirovaniyu podzemnykh gornykh vyrabotok i raschetu krepi.VNIMI, VNIIOMSHS Minugleproma SSSR [Guidelines for the design of underground mine workings and calculation of the support. VNIMI, VNIIOMShS of the USSR Ministry of Coal Industry], Moscow, Stroyizdat, 1983, 272 p.

9. Dias T. G. S., Farias M. M., Assis A. P. Large diameter shafts for underground infrastructure. Tunnelling and Underground Space Technology. 2015, vol. 45, pp. 181–189.

10. Silchenko Yu. A., Pleshko M. S. Shaft lining design with regard to sinking technology. MIAB. Mining Inf. Anal. Bull. 2020, no. 11, pp. 96–107. [In Russ]. DOI: 10.25018/0236-14932020-11-0-96-107.

11. Toksarov V. N., Morozov I. A., Beltyukov N. L., Udartsev A. A. Deformation of underground excavations under conditions of the Gremyachinsk potassium salt deposit. MIAB. Mining Inf. Anal. Bull. 2020, no. 7, pp. 113–124. [In Russ]. DOI: 10.25018/0236-1493-20207-0-113-124.

12. Ageenko V. A., Skvortsov A. A. Rheological properties of rock salt under super long-term sustained uniaxial loading. MIAB. Mining Inf. Anal. Bull. 2019, no. 11, pp. 27–34. [In Russ]. DOI: 10.25018/0236-1493-2019-11-0-27-34.

13. Ageenko V. A. Investigation of rheological properties of rock salt. Izvestiya Ural'skogo gosudarstvennogo gornogo universiteta. 2019, no. 1(53), pp. 115—120. [In Russ].

14. Amusin B. Z., Lin'kov A. M. On the use of variable modules for solving one class of problems of linear hereditary creep. Izvestiya AN SSSR. Mekhanika tverdogo tela. 1974, no. 6, pp. 162—166. [In Russ].

15. Konstantinova S. A., Aptukov V. N. Nekotorye zadachi mekhaniki deformirovaniya i razrusheniya solyanykh porod [Some tasks of the mechanics of deformation and destruction of salt rocks], Novosibirsk, Nauka, 2013.

16. Solov'ev V. A., Aptukov V. N., Vaulina I. B. Podderzhanie gornykh vyrabotok v porodakh solenosnoy tolshchi: Teoriya i praktika [Maintenance of mine workings in the rocks of the saltbearing strata: Theory and practice], Novosibirsk, Nauka, 2017, 264 p.

17. Sergeev S. V., Mishedchenko A. D. The reasons for the destruction of the lining of the shafts in salt rocks. MIAB. Mining Inf. Anal. Bull. 2004, no. 11, pp. 215–217. [In Russ].

18. Sergeev S. V. Vliyanie prokhodki vyrabotok sopryazheniya na napryazhennoe sostoyanie krepi stvola v razdroblennom massive okolostvol'nykh porod [Influence of sink working of the conjugation workings on the stress state of the shaft lining in the crushed rock mass],Tula, 1995, pp. 64—68.