2 multiple choice questions. Consider two series of triaxial compression test data, one for Rock A and one for Rock B. Which of these two rocks deviates the most fromlinear elastic behavior?ADifferential Stress (MPa)ab160140120100806040200Rock A-3Rock BRadial-2 -1 0Axial03-50 MPa0-40 MPa03-5 MPa1 2Strain (me)0-30 MPa03-20 MPa03-10 MPa3 4 5 67Kamali-Asl, A., Ghazanfari, E., Newell, P., & Stevens, M. (2018).Elastic, viscoelastic, and strength properties of Marcellus Shalespecimens. Journal of Petroleum Science and Engineering, 171, 662-679.STRESS (psi)250002000015000Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.1000050000CONFINING 20STRESS(MPB)-0.008-0.0113010.LATERAL--0.006O-0.0040.00200.0040.00230200.006AXIAL0.008100.01STRAINFig. 3.9-Axial stress difference vs. axial and lateral strainfor triaxial compression of sandstone for four confiningstresses.BWarpinski and Smith 1989 in Recent Advancesin Hydraulic Fracturing After running triaxial compression tests and estimating Young's modulus for a rock to be 25 GPa, a series of ultrasound pulse experiments areperformed in order to also estimate dynamic Young's modulus from the wavespeed and density. Is this dynamic Young's modulus expected tobe the same, smaller, or larger than the static Young's modulus obtained from triaxial tests? Assume the rock has a typical level of non-linearity in its behavior.Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.aSmallerb The sameCLargerAnsweredResubmit

As we know the elastic behavior of any material is dependent on th modulus of elasticity of…

Consider two series of triaxial compression test data, one for Rock A and one for Rock B. Which of these two rocks deviates the most from linear elastic behavior? A Differential Stress (MPa) a b 160 140 120 100 80 60 40 20 Rock A -3 Rock B Radial -2 -1 0 Axial 6₁-50 MPa O 40 MPa 03-5 MPa 1 2 Strain (me) 0-30 MPa 03-20 MPa 0-10 MPa 3 4 5 6 7 Kamali-Asl, A., Ghazanfari, E., Newell, P., & Stevens, M. (2018). Elastic, viscoelastic, and strength properties of Marcellus Shale specimens. Journal of Petroleum Science and Engineering, 171, 662- 679. STRESS (psi) 25000 20000 15000 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. 10000 5000 0 130 CONFINING 20 STRESS (MPB) -0.008 -0.01 10*******. LATERAL- O -0.004 -0.006 0.002 0 0.004 0.002 0 30 20 AXIAL 0.006 0.008 10 0.01 STRAIN Fig. 3.9-Axial stress difference vs. axial and lateral strain for triaxial compression of sandstone for four confining stresses. B Warpinski and Smith 1989 in Recent Advances in Hydraulic Fracturing

Consider two series of triaxial compression test data, one for Rock A and one for Rock B. Which of these two rocks deviates the most from linear elastic behavior? A Differential Stress (MPa) a b 160 140 120 100 80 60 40 20 Rock A -3 Rock B Radial -2 -1 0 Axial 6₁-50 MPa O 40 MPa 03-5 MPa 1 2 Strain (me) 0-30 MPa 03-20 MPa 0-10 MPa 3 4 5 6 7 Kamali-Asl, A., Ghazanfari, E., Newell, P., & Stevens, M. (2018). Elastic, viscoelastic, and strength properties of Marcellus Shale specimens. Journal of Petroleum Science and Engineering, 171, 662- 679. STRESS (psi) 25000 20000 15000 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. 10000 5000 0 130 CONFINING 20 STRESS (MPB) -0.008 -0.01 10*******. LATERAL- O -0.004 -0.006 0.002 0 0.004 0.002 0 30 20 AXIAL 0.006 0.008 10 0.01 STRAIN Fig. 3.9-Axial stress difference vs. axial and lateral strain for triaxial compression of sandstone for four confining stresses. B Warpinski and Smith 1989 in Recent Advances in Hydraulic Fracturing

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter12: Subsurface Exploration

Section: Chapter Questions

Problem 12.11P

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250 Failure point Failure point 200 150 100 III II I II III 50 -0.5 1.5 -1 Lateral strain ɛ3, 0.5 1 Axial strain ɛ1, % Axial stress