Volume Change Testing
Volume Change Testing
Volume Change Testing
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Summary<br />
Table 2 Determination of Indices<br />
Index Method<br />
at = de/d(σ - ua) Constant-volume oedometer<br />
am = de/d(ua - uw) am = (am /bm) bm<br />
bt = dw/d(σ - ua) bt = at Gs<br />
bm = dw/d(ua - uw) Pressure plate test<br />
Ct = de/d log(σ - ua) Oedometer test<br />
Cm = de/d log(ua - uw) Cm = (Cm/Dm Gs ) Dm Gs<br />
Dt = dw/d log(σ - ua) Dt = Ct / Gs<br />
Dm = dw/d log(ua - uw) Pressure plate test<br />
am /bm Shrinkage test<br />
Cm/Dm Gs Shrinkage test<br />
Tests required for measurement of volume change indices<br />
for loading (one-dimensional tests)<br />
1) Oedometer Test - compute Ct then ⇒ Dt<br />
2) Pressure Plate Drying Test - compute Dm<br />
3) Shrinkage Test – compute Cm/Dm Gs then ⇒ Cm<br />
Tests required for measurement of volume change indices<br />
for unloading (one-dimensional tests)<br />
1) Oedometer Test (rebound) - compute Cts then⇒ D ts<br />
2) Pressure Plate Wetting Test - compute Dms<br />
3) Free Swell Test – compute Cms/Dms Gs then ⇒ Cms<br />
UNSAT13 - 7
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