SURVEY OF GROUND MOVEMENTS DURING BENTONITE TUNNELLING

Ground movements will be measured during the first full- scale commercial application of the bentonite tunnelling shield in Warrington, England. The survey is an extension of the Transportation Road Research Laboratory's earlier work which concluded that: the bentonite tunnelling system limited ground movements to values similar to those experienced with conventional tunnelling in London Clay; settlement was dependent on tunnelling rate; and an appreciable silt content in the ground can cause difficulties. At Warrington, the survey will determine ground can cause difficulties. At Warrington, the survey will determine ground movement when the bentonite shield is being used under normal production conditions with faster tunnelling rates. The subsidence profile at the surface will be established, while sub-surface movement will be measured by borehole instrumentation direct anchors, magnetic rings and inclinometers. Ground water and bentonite pressure will be measured at various positions around the tunnel. To determine the effect of vibration of the tunnel boring machine on the settlement of cohesion-less soils, ground vibration will be measured by sensors installed also in the boreholes.

  • Availability:
  • Corporate Authors:

    Wells (Edward) and Sons, Limited

    143/145 Camberwell New Road
    London SE5,   England 
  • Publication Date: 1975-9

Media Info

  • Pagination: p. 6
  • Serial:
    • GROUND ENGINEERING
    • Volume: 8
    • Issue Number: 5
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00129022
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 10 1976 12:00AM