Validation of choice of stress–strain analysis method for support and lining in traffic tunnels

Authors: Лебедев М.О. 

A critical point in the traffic tunnel design is the choice of the method for the stress–strain analysis of support and lining to determine the work of the load-bearing structure at high reliability. As a rule, the selection of such methods is connected with the requirements of the standard technical documentation. The stress–strain analysis of support and lining during geotechnical monitoring proves high margin load-bearing capacity of these structures. It is inefficient to use the same tunnel projects indifferent geotechnical conditions in terms of material consumption and labor input of support installation. In many instances, rock pressure taken by temporal supports is not transferred to the permanent lining later on, even when tunnels are operated under vibratory loading. Or, if the rock pressure is transferred to the permanent lining, the stresses and strains in the latter are insignificant. Development of design methods from the arch formation theory before analytical and numerical techniques of continuum mechanics, with regard to the joint work of support– lining–enclosing rock mass, makes it possible to take into account engineering features of tunnel construction, face cutting by stages and structural features of host rock mass. At the same time, it is not always that rather laborious numerical methods ensure reliable results as compared with the actual stress–strain behavior. The experience gained in studies into the stress–strain behavior of tunnel support and lining in various geotechnical conditions, from weak soil to hard rocks, allows sound application of calculation methods with maximally reliable results on the work of the support and lining in specific geotechnical conditions. This article presents the stress–strain analysis data obtained by various methods for the support and lining in the same railway tunnel.

Keywords: Traffic tunnels, monitoring results, forces in support and lining, design methods, sensors, physical and mechanical properties of soil, geophysical research.
For citation:

Lebedev MO. Validation of choice of stress–strain analysis method for support and lining in traffic tunnels. MIAB. Mining Inf. Anal. Bull. 2020;(1):47-60. [In Russ]. DOI: 10.25018/02361493-2020-1-0-47-60.

Acknowledgements:
Issue number: 1
Year: 2020
Page number: 47-60
ISBN: 0236-1493
UDK: 624.191.81; 624.121.532
DOI: 10.25018/0236-1493-2020-1-0-47-60
Article receipt date: 25.04.2019
Date of review receipt: 17.09.2019
Date of the editorial board′s decision on the article′s publishing: 20.12.2019
About authors:

M.O. Lebedev, Cand. Sci. (Eng.), Assistant Professor,
Deputy General Director for Research Activities,
Open Joint Stock Company Scientific, Research,
Design and Surveying Institute «Lenmetrogiprotrans»,
191002, Saint-Petersburg, Russia,
e-mail: lebedev-lmgt@yandex.ru.

For contacts:

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

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