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Effective Stress -
Consolidated Drained

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Results given: You provide:
  • Cohesion (c')*
  • Angle of Friction (phi')*
  • Density
  • Moisture Content
  • Deviator Stress and Strain at peak

* for multistage or sets of specimens

  • Remoulding conditions
    (if applicable)
  • Effective Pressure(s)
    (eg. 50,100,200 kPa)
Typical use(s): Material required:
  • Long-term slope stability
  • Foundation design
Undisturbed:
  • sample with a core length of about 2:1 length:dia ratio of full diameter, intact material
    (ideally at least 2.5:1 length:dia to allow for trimming)
  • block sample twice the size of 2:1 length:dia sample required.

Remoulded:

  • 200g of <6mm material for 38mm dia. specimen
  • 4kg of <20mm material for 100mm specimen.
Description Price excl. VAT

Single stage test up to 4 days duration
(BS1377 : Part 8 : Clause 7 : 1990)

or

Multistage test up to 4 days duration
(BS1377 : Part 8 : Clause 7 : 1990 and
Technical Procedure TP38)

Note:
The 4 day price is the same for a single stage test or a multistage test,
but a multistage test would incur more extra over days.

£ 150.00 per specimen

 

Extra over days in excess of initial 4 days £ 25.00 per day per specimen
Remoulding single specimen £ 17.50 per specimen
Remoulding set of three 38mm diameter specimens £ 17.50 per set of 3 specimens
Notes:
Caution: With fine-grained low permeability materials this test can have a long duration (eg. 1-2 weeks per stage) and correspondingly high charges due to the extra over days incurred. In this case, if there is nothing larger than fine gravel, a set of three 38mm diameter samples may work out less expensive than a multistage 100mm diameter specimen and will have a much quicker turnaround (typically within 2 weeks). Multistage tests on low permeability materials are particularly susceptible to long durations as each successive stage is slowed by the previous consolidation stage reducing the material's permeability.
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