COMPUTER-CONTROLLED TRIAXIAL SOIL TESTING EQUIPMENT IN A COMMERCIAL LABORATORY

The GDS triaxial system described in this article comprises: (1) three digital pressure/volume controllers, which under computer control can apply a specified pressure or enforce a desired volume change; (2) a hydraulic triaxial cell after Bishop & Wesley, which differs from a conventional cell in that the axial load as well as the cell pressure is applied hydraulically; (3) an hp85 microcomputer (incorporating a tape cartridge drive, a small graphics screen and a printer) and a flat-bed plotter. The test control and logging are performed by the hp85 using basic programs. The test procedures that can be carried out are: (a) unconsolidated undrained; (b) consolidated undrained, with pore pressure measurement; (c) drained, with volume change measurement; (d) consolidation and swelling with no lateral strain; (e) a series of up to 9 stress paths, each being either drained or undrained; (f) cyclic loading under constant radial stress, either drained or undrained; (g) cyclic loading with no lateral strain. Three cases of typical uses are described. Mention is made of the advantages and disadvantages of the system. (TRRL)

• 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:
  • Coatsworth, A M
  • HOBBS, N B
• Publication Date: 1984-10

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 19-23
• Serial:
  • GROUND ENGINEERING
  • Volume: 17
  • Issue Number: 7
  • Publisher: EMAP CONSTRUCT LIMITED
  • ISSN: 0017-4653

Subject/Index Terms

• TRT Terms: Consolidation; Consolidations; Control systems; Digital computers; Drainage; Equipment; Laboratories; Laboratory tests; Loads; Microcomputers; Pore water pressures; Pressure; Repeated loads; Saturated soils; Soil stabilization; Soil tests; Soils; Stresses; Swelling; Swelling soils; Testing equipment; Tests; Triaxial shear tests; Unconsolidated soils; Volume; Volume changes
• Uncontrolled Terms: Micro; Undrained conditions; Undrained soils
• Old TRIS Terms: Digital systems; Stress path
• ITRD Terms: 5791: Consolidation (soil); 8673: Digital computer; 2937: Drainage; 3674: Equipment; 6237: Laboratory (not an organization); 5567: Load; 9045: Micro; 5762: Pore water pressure; 5412: Pressure; 5588: Repetitive loading; 4156: Soil; 5575: Stress (in material); 5203: Swelling (soil); 6255: Test; 5566: Triaxial; 5782: Undrained soil; 6468: Volume
• Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00393299
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jun 30 1985 12:00AM