Page 70 - Numerical Analysis and Modelling in Geomechanics
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COMPRESSED AIR TUNNELLING 51
Table 2.6 Stress state variables for specimen 2 (test series 2: increasing suction).
Figure 2.14 Change in shear strength due to increase in suction for specimen 2 (test series
2).
shown that the shear strength increased with increasing matric suction. The
results show that the failure envelope for variation of suction up to 300 kPa is
nearly linear.
Figure 2.15 Mohr circles for specimen 2 (test series 2: increasing suction).
