Analyisis of shallow tunnels construction in swelling grounds

Jakob Likar, Andrej Likar, Jože Žarn, Tina Marolt

Research output: Contribution to journalArticle

Abstract

Swelling pressures of the rock as a result of chemical and physical processes which are present during construction and operation of tunnels and have the influence on loads and deformations of primary and inner concrete lining. Deep geomechanical analysis of swelling indicates that in practice very often conservative way of calculating load capacity of primary as well a sinner lining were used with a goal to keep long-term stability of the tunnel. Particular emphasis was placed on the physical and chemical assessment of the time dependent development of deformation. In the present paper the practical case of tunnel construction in specific swelling clay ground »Sivica« is analyzed. Based on 2D and 3D geostatic analyses, a rigid primary lining was chosen as a final design, because the depth of the tunnel is only about 30 m below the surface. The geotechnical parameters of hoist ground »Sivica« are a result of laboratory and »in situ« tests, which were conducted according to technical standards. During a construction and after it the geotechnical measurements were conducted. The measurement results confirm the correct technical decision in the design stage.
Original languageEnglish
Pages (from-to)175-191
Number of pages17
JournalRMZ Materials and Geoenvironment
Volume62
Issue number3
Publication statusPublished - Nov 2015

Keywords

  • cestni predor
  • metoda končnih elementov
  • primarna obloga
  • brizgani beton
  • geotehnične meritve

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    Likar, J., Likar, A., Žarn, J., & Marolt, T. (2015). Analyisis of shallow tunnels construction in swelling grounds. RMZ Materials and Geoenvironment, 62(3), 175-191.