2019, Vol. 6, No. 3. - go to content...

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DOI: 10.15862/14SATS319 (https://doi.org/10.15862/14SATS319)

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Shen Qiaofeng, Frolov Yu.S. The solution of geomechanical tasks in stage technology disclosure of the workings of the great migration in low-strength rock. Russian Journal of Transport Engineering. 2019; 6(3). Available at: https://t-s.today/PDF/14SATS319.pdf (in Russian). DOI: 10.15862/14SATS319

The solution of geomechanical tasks in stage technology disclosure of the workings of the great migration in low-strength rock

Shen Qiaofeng
Saint Petersburg railway transport university of emperor Alexander I, Saint Petersburg, Russia
E-mail: 18813094515@163.com

Frolov Yuri Stepanovich
Saint Petersburg railway transport university of emperor Alexander I, Saint Petersburg, Russia
E-mail: fus.frolov@yandex.ru

Abstract. The materials presented in the article will be used in the dissertation for the postgraduate of technical sciences. The paper introduces the construction situation of urban subways in China, and points out that the construction of the station complex adopts closed approach on the newly built subway lines, usually on rocky soils with low-strength. This paper provides research data on the support of the large-span station roadway and the stress deformation of the surrounding soil layer. These data are obtained by numerical analysis based on the finite element method. The main attention is paid to the degree of influence of the sequence of execution of tunneling operations on the sustainability of production when developing the soil enclosed between the internal diaphragms. It is noted the feasibility of these works with the simultaneous destruction of the temporary lining of the side of the pilot tunnels. The numerical simulation results is evaluated according to the surface settlement value, the nature of the soil stress-deformation state, the temporary support of the contour (primary lining) and the vertical and horizontal displacement values of the feature points on the inner wall, and the anchoring force values. The results obtained are presented in tabular and graphical form and analyzed.

Established numerical simulation methods are used to comprehensively assess the stability of large-span tunneling, which will help to make reasonable engineering decisions in the construction of a single station on a subway line.

Keywords: single vaulted station; long-span tunneling; numerical simulation; support; stage technology; stability prediction; lateral pilot tunnel method

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