This article gives the background to the Chinnor tunnelling trials and an outline of the progress that has been made. Because the rate of tunnelling is a critical factor affecting costs, TRRL's tunnelling research has concentrated on excavation and primary mucking systems. The Chinnor trials represent the first full-scale studies that back up laboratory and pilot scale studies. After discussing the choice of the site (in the lower chalk) the authors outline the scope of the work which is primarily aimed at obtaining data relating to the performance of tunnelling machines and how it is affected by various factors; secondary objectives are the development of instrumentation and data processing systems, the study of debris clearance and performance of the machine, the study of the relation between site investigation and actual conditions, and the study of ground movements caused by tunnelling. The authors give details of the cutting head and tunnelling machine used at Chinnor and briefly discuss the initial trials. This is followed by A discussion of the principal factors being studied; rock cutting tool forces, head rotation speed, rate of advance and alignment of the head, hydraulic delivery pressure to the head, machine thrust, energy consumption and hydraulic oil pressure supplied to the reaction ring. Data acquisition is next discussed followed by an outline of the programme of tunnelling to be employed. This includes a diagram showing the proposed stages of the rock cutting experiments which are designed to provide data useful in the selection of tools appropriate to different rock formations. /TRRL/

  • Availability:
  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Higneh, H J
    • Boden, J B
  • Publication Date: 1974-11-12

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 65-70
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00097606
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 15 1975 12:00AM