Stress-and-strain statement of the travolator metro tunnel lining in course of construction and operation

A travolator (transitional) tunnel between the station and the escalator tunnel with a lobby was built to provide the access to the second exit from the “Sportivnaya” metro station of the St. Petersburg metro. As the main supporting structure, a lining of reinforced concrete blocks was adopted. The outer diameter of the lining is 7.9 m and the inner diameter is 7.2 m. From the side of the station complex the transitional tunnel is located in the zone of influence of several tunnels, which were built earlier. Moreover, it crosses a backfilled tunnel along the route. In such conditions a number of complex problems arise, including the calculation of the stress-and-strain state of the tunnel lining, represented by ribbed reinforced concrete tubings. In order to determine the actual strength in the lining of the transition tunnel under various geometric conditions of mutual arrangement with existing tunnels, field studies were performed. Regularities of the stress-and-strain state formation of the lining at all stages of construction and during 5 years of operation were obtained. The obtained results of the actual stressand-strain state of the tunnel lining were the basis for the verification of the design models for the FEM numerical simulation. The calculations were performed for a three-dimensional finite element mathematical model in the Plaxis 3D computational complex. Comparison of the calculation results with the data of field studies made it possible to obtain the following main conclusion: 23 years that have passed since the construction of the existing tunnels have no more influence on the formation of the stress-and-strain state of the travolator tunnel lining than the technological factors of their construction.

Lebedev M. O., Stepukov E. V., Larionov R. I. Stress-and-strain statement of the travolator metro tunnel lining in course of construction and operation. MIAB. Mining Inf. Anal. Bull. 2022;(6−2):98—114. [In Russ]. DOI: 10.25018/0236_1493_2022_62_0_98.

Lebedev M. O., Cand. Sci. (Eng.), Deputy Director General for research activities,http:// orcid.org/0000-0002-7749-442X, OJSC “NIPII Lenmetrogiprotrans”, 191002, SaintPetersburg, BolshayaMoskovskaya, 2, Russia, e-mail: lebedev-lmgt@yandex.ru;
Stepukov E. V., junior researcher, http://orcid.org/0000-0002-3321-1440, OJSC “NIPII Lenmetrogiprotrans”, 191002, Saint-Petersburg, BolshayaMoskovskaya, 2, Russia, е-mail: estepukov_lmgt@mail.ru;
Larionov R. I., Cand. Sci. (Eng.), head of the geomechanics laboratory, http://orcid. org/0000-0002-1297-6823, OJSC “NIPII Lenmetrogiprotrans”, 191002, Saint-Petersburg, BolshayaMoskovskaya, 2, Russia, roman.larionov.spmi@gmail.com.

Lebedev M. O., e-mail: lebedev-lmgt@yandex.ru.

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