Figure 6

Test results on KFS with a critical friction angle \(\varphi _c\) = 33.1\(^\circ\): (a) without preshearing history of Test AP1 as reference test, (b) preshearing history in compression area of Test AP3 with mobilized friction angle \(\varphi _{\text {mob}}\) = 32.4\(^\circ\) and (c) preshearing history in extension area of Test AP9 with mobilized friction angle \(\varphi _\text {mob}\) = 29.1\(^\circ\). \(D_{r0}\) after sample preparation (air pluviation) and \(D_{r1}\) at start of drained stress paths.