Civil Engineering Reference
In-Depth Information
Figure 14.20
Multiple failure state direct shear test (Wittke 1990)
14.6
Swelling
Swelling tests with confined lateral strain
Swelling tests with confined lateral strain are normally conducted on cylindrical specimens
with a height-to-diameter ratio H:D ranging from 1:2 to 1:3.5 prepared from drill cores
recovered using air flushing or a drilling fluid containing an anti-swelling additive. Spec-
imen heights of 20 - 30 mm and specimen diameters of 50 - 100 mm are recommended
(ISRM 1989a, ISRM 1999b). Frequently used specimen dimensions are H = 20 mm
and D = 70 mm (DGEG 1986). The preparation of specimens is carried out as de-
scribed in Section 14.4.1.
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