GEOTECHNICAL MONITORING IN CONSTRUCTION OF ESCALATOR TUNNELS

Construction of escalator tunnels in the Saint-Petersburg subway uses the ‘classical’ technology with artificial freezing of soil. With such method involved, the maximum subsidence of ground surface was observed in the period of soil thawing and reached 550 mm, and even 900– 1000 mm sometimes. In the recent 15 years, the escalator tunnels were constructed using two novel technologies characterized with small subsidence of ground surface: with enclosing structures and with mechanized tunneling using tunnel boring machinery. The ground surface subsidence was not more than 100 mm in the first (pilot) application of the technologies and made 20–25 mm during subsequent applications. During construction of escalator tunnels, geotechnical monitoring involves geotechnical survey of the lining–soil mass system. The geotechnical monitoring enables safe construction of escalator tunnels, with adjustment of process variables, or design of support and lining. The database created during the observations makes it possible to analyze the research finding in terms of the technologies and structural solutions in use, and to amend the next similar projects.

For citation: Lebedev M. O., Egorov G. D. Geotechnical monitoring in construction of escalator tunnels. MIAB. Mining Inf. Anal. Bull. 2019;(10):146-159. [In Russ]. DOI: 10.25018/0236-1493-2019-100-146-159.

Keywords

Escalator tunnel, new technologies, geotechnical monitoring, deformation, database.

Issue number: 10
Year: 2019
ISBN: 0236-1493
UDK: 624.191.22; 624.121.532
DOI: 10.25018/0236-1493-2019-10-0-146-159
Authors: Lebedev M. O., Egorov G. D.

About authors: M.O. Lebedev, Cand. Sci. (Eng.), Vice Director for Research, e-mail: lebedev-lmgt@yandex.ru, G.D. Egorov, Senior Researcher, e-mail: krisha1@yandex.ru, Open Joint Stock Company «Scientific, Research, Design and Surveying Institute «Lenmetrogiprotrans», 191002, Saint-Petersburg, Russia. Corresponding author: M.O. Lebedev, e-mail: lebedev-lmgt@yandex.ru.

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