THE TRIASSIC ROCKS, WITH PARTICULAR REFERENCE TO PREDICTED AND OBSERVED PERFORMANCE OF SOME MAJOR FOUNDATIONS

An outline of the geology of the trias in the British isles is given, together with a description of its depositional environment. The lithology is described and attention is drawn to differences to be expected between materials in basins, shelf areas between basins, and marginal zones. Faulting, weathering and alteration by leaching are discussed. Variation of the Triassic rocks with depth and from place to place is examined in terms of the drained modulus of elasticity, e. For a number of sites, depth profiles of modulus, and other data, are presented; these are related to lithology and weathering which are related in turn to the geology. E values were obtained from laboratory tests, field tests and by back-analysis of observed settlements. In this connexion a settlement calculation procedure is presented. Three major case histories are described: heysham, where calculated and observed settlements are in agreement; oldbury, where the observed settlement greatly exceeded that calculated, and cardiff, where it was considerably less. Possible explanations of the differences are discussed based for oldbury on the results of the subsequent b station investigation, and for cardiff on a programme of investigation in a nearby quarry. Suggestions are made concerning drilling methods and investigation procedures. (A) /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00168505
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Meigh, A C
• Publication Date: 1976-9

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 391-452
• Serial:
  • GEOTECHNIQUE
  • Volume: 26
  • Issue Number: 3
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Bridges; Creep; Drained soil; Field tests; Foundations; Geology; Ground settlement; Laboratories; Modulus of elasticity; Rocks; Sandstones; Silts; Tests; Variables; Weathering
• Geographic Terms: United Kingdom
• ITRD Terms: 3455: Bridge; 4732: Creep (mater); 5781: Drained soil; 3377: Foundation; 4053: Geology; 6226: In situ; 6237: Laboratory (not an organization); 5919: Modulus of elasticity; 4154: Rock; 4104: Sandstone; 5792: Settlement; 4149: Silt; 6255: Test; 8119: United Kingdom; 9086: Variability; 5281: Weathering
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls; I43: Rock Mechanics;

Filing Info

• Accession Number: 00147474
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Sep 20 1977 12:00AM