GROUND-LINING PRESSURE DISTRIBUTION AND LINING DISTORTION IN TWO TUNNELS DRIVEN THROUGH STIFF, STONY/LAMINATED CLAY

This article describes the design, construction, and calibration of a hybrid electro-hydraulic type of earth pressure cell and the subsequent use of these cells for the measurement of radial ground pressures acting on concrete segmental tunnel linings at two locations in mixed clayey ground in north-east England. Also described is an accompanying programme of lining distortion measurement. The tunnels studied were 3.20 m dia. at depths of 11.77 m and 12.39 m to the crown. Terminal ground-lining interaction pressures were found to be almost uniformly distributed about the tunnel cross-section, these recorded pressures being one-half the theoretical maximum over-burden pressure calculated on a gamma z basis. Furthermore, these ultimate pressures were achieved after a period of only 7-8 days following lining erection and grouting-up. Lining distortion measurements support these observations. This rapid stabilisation of ground pressure at the lining contact contrasts with a much more protracted on-going pressure build-up and lining distortion reported by some other workers for different ground conditions, but is is certainly consistent with contractual experience which suggests that tunnel secondary linings could be safely erected, with little risk of brittle fracture, much earlier following primary lining construction that has hitherto been considered prudent. /Author/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00174653
• Corporate Authors:

  Foundation Publications Limited

  7 Ongar Road
  Brentwood CM15 9AU, Essex,   England 
• Authors:
  • Attewell, P B
  • El-Naga, N M
• Publication Date: 1977-4

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 28-35
• Serial:
  • GROUND ENGINEERING
  • Volume: 10
  • Issue Number: 3
  • Publisher: EMAP CONSTRUCT LIMITED
  • ISSN: 0017-4653

Subject/Index Terms

• TRT Terms: Clay soils; Concrete structures; Cross sections; Distortion (Structures); Earth pressure; Grouting; Pressure; Soil stabilization; Tunnel lining
• Uncontrolled Terms: Pressure distribution; Stabilization
• Old TRIS Terms: Distortion (Structural)
• Subject Areas: Construction; Geotechnology; Highways;

Filing Info

• Accession Number: 00165948
• Record Type: Publication
• Report/Paper Numbers: Analytic
• Files: TRIS
• Created Date: Apr 26 1978 12:00AM