DIFFICULT CONDITIONS AT SCHOENRAIN

This article describes in detail the difficulties faced in the construction of the Schoenrain railway tunnel in Germany, and how they were handled. The twin-track tunnel is near Gemuenden in Bavaria, and forms part of a curve connecting the Frankfurt to Werzburg railway line with the new high-speed line from Hanover to Wuerzburg. The tunnel is 3942m long with a maximum longitudinal slope of 12.5%. The maximum overburden above it is 160m, and it passes under the existing Muehlberg rail tunnel. The geology of the ground is very complicated and difficult, with various rock types and groundwater types, and nearly vertical shear zones, faults and joints. About 80% of the tunnel is below a groundwater table with discontinuous joints, so that water inflow was a severe problem. During the excavation of the bench an invert, longitudinal crack occurred in the shotcrete roof lining for about 8% of the tunnel's length. The tunnel was excavated using the New Austrian Tunnelling method (NATM). An invert arch was constructed in sections subject to rock pressure and in weak rock zones. In stable to friable rock conditions, a 500mm thick watertight invert slab was formed. Settlements were limited by: (1) a short advance length of 1m in the top heading; (2) rigid support by 250mm thick shortcrete and steel arches; and (3) use of immediately effective Atlas Copco 'Super- Swellex' and prestressed rockbolts.

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  • Corporate Authors:

    THE MINING JOURNAL LTD

    60 WORSHIP STREET
    LONDON,   United Kingdom  EC2A 2HD
  • Authors:
    • John, M
    • POSCHER, G
  • Publication Date: 1994-11

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 367-8,370,372,375,377
  • Serial:
    • WORLD TUNNELLING
    • Volume: 6
    • Issue Number: 9
    • Publisher: THE MINING JOURNAL LTD
    • ISSN: 0956-8700

Subject/Index Terms

Filing Info

  • Accession Number: 00663448
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 24 1994 12:00AM