Page 211 - Fundamentals of Computational Geoscience Numerical Methods and Algorithms

202 8 Spontaneous Crack Generation Problems in Large-Scale Geological Systems

5.00E+07

LR = 1.0m/s
4.00E+07 LR = 10m/s
Deviatoric Stress (Pa) 3.00E+07

2.00E+07

1.00E+07

0.00E+00
0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
Axial Strain
2
(A) 1× m sample

5.00E+07

LR = 1.0m/s
4.00E+07 LR = 10m/s
Deviatoric Stress (Pa) 3.00E+07

2.00E+07

1.00E+07

0.00E+00
0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
Axial Strain
2
(B) 1× km sample
Fig. 8.8 Effects of loading rate and sample size on the deviatoric stress versus axial strain curve
using the proposed loading procedure

1000 particles are used to conduct biaxial compression tests using the improved
conventional loading procedure. Figure 8.9 shows the effect of the loading rate on
the curve of deviatoric stress versus axial strain for both the small and the large test
samples of 1000 particles using the improved conventional loading procedure. As
mentioned previously, the strain rates of both the small and the large test samples are