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SHEAR User’s Guide
5.10 Final Moisture Content
The final moisture content is calculated using the same method as the initial. Refer to § 5.1.1 for
details.
5.11 Stress and Strain Calculations - TX and UCC
Stress and strain calculations for triaxial and unconfined compression tests are very similar.
Triaxial tests differ in that they may include corrections for filter paper and rubber membrane strengths.
Additionally, consolidated drained (CD) tests may have volumetric change readings that enter into the
calculation of the cross-sectional area. The following sections explain the methods used in these
calculations.
5.11.1
Strain Calculations - TX and UCC
The sample strain at any given reading is the ratio of the change in sample height to the initial
sample height. It is usually expressed as a percentage.
⇒
Note: When entering deformation data for a staged test the initial dial reading should
not be entered as 0 unless the dial gauge (digital display) is actually reset. It is
necessary that the strain at the initial reading for all specimens is 0 when entering
readings for staged tests.
Strain:
ε=
∆H n
Hc
where: ε
∆Hn
Hc
= strain (decimal)
= change in height at reading n
= consolidated (TX) or initial (UCC) specimen height
∆Hn = (DDn - DDi) x DDC
where: DDn
DDi
DDC
= deformation dial reading in user units at dial reading n
= initial reading, user units
= dial constant converting input units to actual units of length
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