Safe operation of transportation tunnels based on predictive modeling of active geomechanical processes

Assessment of serviceability status of long-term operating tunnels requires the qualitative and quantitative analysis of effect exerted by different defects on load-bearing margin of tunnel lining. Major defects of lining are cracks, falls, weakening areas, internal voids, etc. The studies involved the generalized data on 22 railway tunnels in the south of Russia. On this base, the numerical models of tunnels with damaged lining are constructed. The modeling has found out that part-through internal voids and surface falls initiate local zones of stress concentration in lining. Deep defects that extend along the tunnel axis by 0.25 span and longer feature the highest hazard. The stress envelope in the lining is asymmetrical in this case, and the values of maximal stresses are higher by 15–50% than in the standard-quality lining. The highest danger is constituted by concrete of reduced actual strength in the zone of a defect. These conditions promote further growth of imperfections and nonserviceability of lining due to formation of fracture zones and development of excessive deformation. Assessment of serviceability of tunnel lining requires analyzing joint impact of different defects.

Keywords: tunnel, lining, defect, stresses, strains, load-bearing capacity.
For citation:

Meskhi B. Ch., Pleshko M. S., Voinov I. V., Caixao J. J. Z. Safe operation of transportation tunnels based on predictive modeling of active geomechanical processes. MIAB. Mining Inf. Anal. Bull. 2020;(8):86-96. [In Russ]. DOI: 10.25018/0236-1493-2020-8-0-86-96.

Acknowledgements:
Issue number: 8
Year: 2020
Page number: 86-96
ISBN: 0236-1493
UDK: 624.195
DOI: 10.25018/0236-1493-2020-8-0-86-96
Article receipt date: 19.04.2019
Date of review receipt: 06.04.2020
Date of the editorial board′s decision on the article′s publishing: 20.07.2020
About authors:

B.Ch. Meskhi1, Dr. Sci. (Eng.), Professor, Rector, e-mail: reception@donstu.ru,
M.S. Pleshko1,2, Dr. Sci. (Eng.), Assistant Professor; Professor, e-mail: mixail-stepan@mail.ru,
I.V. Voinov, Graduate Student, e-mail: voinov_22@mail.ru, Rostov State Transport University, 344038, Rostov-on-Don, Russia,
Johan Jacinto Zeca Caixao2, Graduate Student, e-mail: jjacintlos@gmail.com,
1 Don State Technical University, 344023, Rostov-on-Don, Russia.
2 National University of Science and Technology «MISiS», 119049, Moscow, Russia.

For contacts:

M.S. Pleshko, e-mail: mixail-stepan@mail.ru.

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