A NUMERICAL METHOD FOR THE ANALYSIS OF UNLINED PRESSURE TUNNELS IN JOINTED ROCK. PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON NUMERICAL METHODS IN GEOMECHANICS, 11-15 APRIL 1988, INNSBRUCK, AUSTRIA. VOLUMES 1 - 3

This article describes a joint element finite element method which uses Barton's empirical joint model and the theory of elasto-plasticity with a non-associated flow rule to reproduce the experimentally observed pre- and post-peak plasticity behaviour and associated dilational characteristics of rock joints. The incremental secant stiffness iteration procedure developed ensures numerical convergence in cases of non-liner behaviour including strain softening. Three major failure modes, hydraulic jacking, hydraulic shearing and uplift of the ground surface, have been identified for unlined pressure tunnels. The effects of in situ stresses, overburden thickness and the locations of joints parallel to the ground surface have been demonstrated. Low lateral in situ stresses, thin overburden rock and the existence of a joint parallel and near to the ground surface are adverse conditions for unlined pressure tunnels. The analysis of a hypothetical practical case is also presented. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/906191809X
• Corporate Authors:

  AA Balkema

  P.O. Box 1675
  Rotterdam,   Netherlands  BR-3000
• Authors:
  • Lu, Ming
  • Brown, E T
• Publication Date: 1988

Media Info

• Features: References;
• Pagination: p. 1473-80
• Serial:
  • Publication of: Balkema (AA)
  • Publisher: AA Balkema

Subject/Index Terms

• TRT Terms: Conferences; Dilatancy; Excavation; Failure; Hydraulics; Interfaces; Mathematical models; Pipe laying; Rock jointing; Rock mechanics; Simulation; Stresses; Tunnels
• Old TRIS Terms: Rock joints
• ITRD Terms: 8525: Conference; 5155: Excavation (process); 5520: Failure; 5431: Hydraulics (fluid); 5429: Interface; 4089: Joint (geomorphol); 6473: Mathematical model; 3371: Pipe pushing; 4154: Rock; 5757: Rock mechanics; 9103: Simulation; 5575: Stress (in material); 5203: Swelling (soil); 9080: Three dimensional; 3374: Tunnel
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways;

Filing Info

• Accession Number: 00492669
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 90-6191-809-X
• Files: ITRD, TRIS
• Created Date: Mar 31 1990 12:00AM