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Figure 9. Triaxial testing white sandstone discrete failure

Uniaxial compressive strength (UCS) test | Figure 1. Machine with mounted specimen that uses in UCS test | Figure 3. Machine with mounted specimen that uses in Brazilian test | Elastic constants test |


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Figure 10. Triaxial testing red sandstone discrete failure

Figure 11. Triaxial testing red sandstone multi state failure

It should be noted that shear and normal stress acting on any plane within sample. And they always lie on a Mohr’s circle (figure 12).

Figure 12. Mohr’s circle

According to figure 12 it can possible to find :

(6)
(7)

where – radius of the Mohr’s circle;

– central point of the Mohr’s circle on axis;

Type of test and material R Area № of sample Axial load, kN Axial stress - σ₁, MN/ Confining stress - σ₃, MN/ Confining stress, psi Center of the Morh circle
White Sandstone 0.019 0.00113 w6   187.907 6.895 90.506   97.401
w7   281.419 20.684 130.367   151.052
w8 399.5 352.436 34.474 158.981   193.455
Red Stone 0.019 0.00113   52.5 46.315 6.895 19.710   26.605
    66.164 13.790 26.187   39.977
  102.5 90.425 27.579 31.423   59.002
Red Stone (Multi state test) 0.019 0.00113     44.9918 6.9 19.0459   25.9459
    65.28221 13.8 25.74111   39.54111
    77.6329 20.7 28.46645   49.16645

Table 4. Results of triaxial testing analysis

It should be noted that relationship between shear and normal stress must generate a straight line that touches each of the Mohr’s circles at only one point. As a result it can possible to determinate cohesion – C and internal fraction angle – tan φ (figure 13).


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Triaxial strength testing| Figure 21. Signal of S wave

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