CHANNEL TUNNEL - EXCAVATION OF THE CASTLE HILL SECTION BY USE OF ROADHEADERS . TUNNEL CONSTRUCTION 90. PAPERS PRESENTED AT THE TUNNEL CONSTRUCTION 90 CONFERENCE, ORGANIZED BY THE INSTITUTION OF MINING AND METALLURGY, LONDON, 3-4 APRIL, 1990

This article describes the construction of the "Castle HIll" section of the Channel tunnel, located west of the Chariton Terminal near Folkestone, which was built by the New Austrian Tunnelling Method (NATM) and by using road-headers. Two running tunnels and one service tunnel were constructed through strata consisting of chalk and glauconitic marl, and gault clay, with a maximum overburden of 73 m above crown level. All tunnels had to pass through a 150 m long landslip zone with heavily disturbed rock. The rock itself showed low strength. All tunnels were executed in horseshoe profile with invert arch. Most of the service tunnel was excavated in full section with vertical face. Isolated fractured zones in the gault clay were driven through by short topheading. After 140 m excavation in full section with vertical face, the driving method was changed to full section with inclined face, because of instability of the vertical face. The running tunnels, were located partly in glauconitic marl and partly in chalk marl and the driving method was full section with inclined face. An Alpine Tunnel Miner ATM 70 roadheader was used. Details of the sequence of operation, cutting range, loading range of the movable apron are provided, as are details of: weekly advance rates, peak cutting rates, and energy consumption. Details of the methods used to stabilize the rock face are also provided. For the covering abstract of the conference

  • Availability:
  • Corporate Authors:

    Institution of Mining & Metallurgy

    44 Portland Place
    London W1N 4BR,   England 
  • Authors:
    • Sandtner, A K
  • Publication Date: 1990

Language

  • English

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Filing Info

  • Accession Number: 00605000
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 1-870706-17-X
  • Files: ITRD, TRIS
  • Created Date: Feb 28 1991 12:00AM