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tectonic displacement (Section 2.4). In stage 1 the shearing was interrupted at an early
stage when the specimen tended to rotate (Fig. 15.21). The test was therefore evaluated
only for stages 2 to 4. The shear stress versus normal stress plot represented in Fig. 15.22
shows that the determined shear parameters of c
D
= 198 kPa and
φ
D
= 18° for peak
strength and residual strength coincide. This behavior is typical for discontinuities that
have formerly experienced shear displacement (Wittke 1990).
Figure 15.21
Shear stress versus shear displacement plot as a result of a multi-failure-state direct shear
test on a clay-filled, schistosity-parallel discontinuity (Wittke 1990)
Figure 15.22
Shear stress versus normal stress plot as a result of a multi-failure-state direct
shear test on a clay-filled, schistosity-parallel discontinuity (Wittke 1990)
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