Written test 3

Question 1

What is the definition of strain (normal strain)?

Answer 1

a

Question 2

What is the definition of shear strain?

Answer 2

a

Question 3

How many strain components and which (in a x,y,z-system) are necessary to describe the state of strain in a general case in
- 2 dimensions: - 3 dimensions:

Answer 3

a

Question 4

Explain: principal strain?

Answer 4

aa

Question 5

Explain: invariant!

Answer 5

a

Question 6

Explain: Mohr’s strain circle!

Answer 6

a

Question 7

Explain: Compatibility equation!

Answer 7

a

Question 8

Explain: Constitutive relation!

Answer 8

a

Question 9

Explain: Anisotropy!

Answer 9

a

Question 10

Explain: Elastiskt material?

Answer 10

a

Question 11

Explain: Visco elastic material!

Answer 11

a

Question 12

Describe the geomechanics sign convention for strains and displacements!

Answer 12

a

Question 13

In which two groups can the methods used to determine the elastic parameters for intact rock and rock masses be divided into?

Answer 13

a

Question 14

Which are the methods used to determine the elastic parameters?

Answer 14

a

Question 15

You are going to carry out a detailed analysis of a borehole. Which test method do you use to determine the elastic parameters?

Answer 15

a

Question 16

You are responsible for an analysis of a large rock cavern with the size: width = 10 m, height = 8 m and length = 25 m. Which method do you choose to determine the elastic properties of the rock mass??

Answer 16

a

Question 17

You are going to calculate the settlements of a foundation with the size: 3x2 m. Which method do you choose to determine the elastic properties of the rock?

Answer 17

a

Question 18

Describe the evaluation of the elastic parameters from a uniaxial compressive test.

Answer 18

a

Question 19

Explain stability and local and global stability!

Answer 19

a

Question 20

What are the main factors leading to stability problems (for instance,caving in tunnels and fallouts from rock slopes)?

Answer 20

a

Question 21

Describe a stability analysis?

Answer 21

a

Question 22

Which are the measures that can be taken to improve the stability?

Answer 22

q

Question 23

How do the blasting influence the stability?

Answer 23

q

Question 24

How can the stability be monitored?

Answer 24

q

Question 25

Are all rock constructions designed for the same lifetime?

Answer 25

q

Question 26

List the factors which influence the lifetime for a rock construction!

Answer 26

q

Question 27

Consider a rock slope with slope angle 45° with the major principal stress orientation perpendicular to the slope and the magnitude σH=2.5σv.. a) Draw the stress trajectories for the major principal stress in the vicinity of the rock slope. b) Illustrate the stress state at the slope face by drawing the stress components acting on a infinitesimal element. c) Which conclusions can be drawn based on the excersies?

Answer 27

q

Question 28

Which factors can be expected to influence the stability of a rock slope?

Answer 28

q

Question 29

A rock slope is planned in a rock mass which is fully saturated, i.e., the groundwater table coincides with the ground surface. Draw the groundwater surface in principal after the excavation of the slope.

Answer 29

q

Question 30

How is the shear strength of a joint formulated in Mohr-Coulomb ́s failure criterion?

Answer 30

a

Question 31

If the joint plane in the rock mass is situated under the groundwater table, how is the shear strength of the joint affected?

Answer 31

a

Question 32

Which failure modes and stability problems can be expected in the rock masss as a result of a foundations on rock?

Answer 32

a

Question 33

Which types of constructions are considered under the headline rock foundations?

Answer 33

a

Question 34

Describe a typical stability analysis for a rock foundation.

Answer 34

a