18. In a 2D finite element wellbore model how can overburden and tectonic stress

Question

18. In a 2D finite element wellbore model how can overburden and tectonic stresses be incorporated into the analysis? a. Adding restraints to the boundaries of the model b. They are calculated from nodal displacements and then input at the hole wall c. Applied as pressure loads on mesh boundaries d. none of the above 19. Which of the following discontinuities might reduce the strength of a ro a. unconformities b. joints c. intrusive contacts d. all of the above 20. What type of fault is associated with compressional principal stresses a. strike slip b. reverse c. normal d. none of the above 21. The injection of cement under high pressure into grout holes drilled beneath a dam serves what purpose? a. prevent leakage of reservoir through foundation rocks b. reduce permeability of fault zone gravel c. provide seepage control beneath dams d. all of the above 22. As the Young's Modulus of a rock increases: a. P & S wave velocities in the rock increase b. P wave velocity increases and S wave velocity decreases c. P wave velocity decreases and S wave velocity increases d. none of the above 23. Accelerations from earthquake ground motion in a multistory building a. are independent of building height- b. decrease with height from basement level c. increase with height from basement level d. are equal on all floors of a building

Explanation / Answer

19. d. all of the above.

20. c. Normal

21. d. all of the above.

22. a. P and S waves velocities in a rock increase.

23. c. Increase with height from the base level

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