412. Discuss the influence of rock mass discontinuity persistence on the stability of tunnels excavated in hard rock formations.
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412. Discuss the influence of rock mass discontinuity persistence on the stability of tunnels excavated in hard rock formations.
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- Estimate the ratio of the horizontal to the vertical permeability of these four strata. k₁ = 10³cm/sec k₂ = 2x10 cm/sec k3= 10 cm/sec k4= 2x10³ cm/sec H₁ = 3' H₂=3' H3 = 3' H4=3'Discuss the different criteria that is normally employed in the classification of metamorphic rock. (3-5 sentences)In a 4 cm diameter pipeline carrying laminar flow of a liquid withu = 1.6 centipoise, the velocity at the axis is 2 m/s. What is the shear stress midway between the wall and the axis?
- 10. Show that the volume change per unit of volume (AV/V) of a rock core undergoing compression is approximately equal to the sum of the three normal strains.this is a rock mechanics class1. Triaxial compression tests are done on quartzite rocks, the results are shown below. (0₁+03)/2 -964.25 14500 19575 23200 29000 43210 63075 psi (01-03)/2 964.25 14500 18850 21750 26100 35960 48575 psi Comment on the applicability of each of the Mohr-Coulomb, Griffith, and Hoek-Brown criteria for the testing results.