Effect of soil body structure of mixed-type tunnel face on shape and size of subsidence trough on ground surface

The article describes the studies into the influence exerted by a soil body structure on the shape and size of a subsidence trough on ground surface under varying stresses and strains during construction of a double track subway tunnel by shield TBM tunneling with face pressure. The results were obtained from 3D finite-element modeling of a tunnel being constructed in soft ground featuring widely ranged strength and deformation characteristics. The modeling included the varied structure of the soil body of the mixed-type tunnel face. The change in the shape and size of the subsidence trough was estimated using three parameters: the area of subsidence, the value of subsidence above the tunnel axis, the distance between the vertical axis of the tunnel section and the point of curvature of the cross profile of the subsidence trough. The graphs of the subsidence trough shape and size parameters against the varying structure of the soil body of the mixed-type face are plotted. According to the modeling results, the greatest change in the size of the subsidence trough in case of a soil body having a uniform structure and the uniform physical and mechanical properties reaches 38% and occurs at the shortest spacing between the softened or strengthened soil layer and the tunnel axis. As the tunnel axis approaches the softened soil layer, the shape of the subsidence trough becomes flatter, which is confirmed by the different rates of change in subsidence above the tunnel axis and by the different distances between the vertical axis of the tunnel cross-section and the point of curvature of the cross profile of the subsidence trough.

Keywords: multi-layered ground, face pressure, shield TBM, tunnel, subway, Gaussian curve, subsidence trough.
For citation:

Protosenya A. G., Kumov V. V. Effect of soil body structure of mixed-type tunnel face on shape and size of subsidence trough on ground surface. MIAB. Mining Inf. Anal. Bull. 2024;(4):5-21. [In Russ]. DOI: 10.25018/0236_1493_2024_4_0_5.

Issue number: 4
Year: 2024
Page number: 5-21
ISBN: 0236-1493
UDK: 622.831.31
DOI: 10.25018/0236_1493_2024_4_0_5
Article receipt date: 11.12.2023
Date of review receipt: 25.01.2024
Date of the editorial board′s decision on the article′s publishing: 10.03.2024
About authors:

A.G. Protosenya1, Dr. Sci. (Eng.), Professor, Head of Chair, e-mail: Protosenya_AG@pers.spmi.ru, ORCID ID: 0000-0001-7829-6743,
Kumov1, Graduate Student, e-mail: vshuk1@mail.ru, ORCID ID: 0009-0006-2820-2941,
1 Empress Catherine II Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

For contacts:

V.V. Kumov, e-mail: vshuk1@mail.ru.


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