The Delft Sand, Clay & Rock Cutting Model, 2019a

Exercises.
Chapter 16:
Exercises.
16.1. Introduction.
This book is used for the courses OE4607 Introduction Dredging Engineering and OE4626 Dredging Processes I
of the MSc program Offshore & Dredging Engineering of the Delft University of Technology. The exercises are
questions of the exams. After each exam, the new questions will be added to this chapter.
16.2. Chapter 2: Basic Soil Mechanics.
16.2.1. MC: Mohr Circles 1.
Which of the following statements are true?
The bold green answers are true.
1. The Mohr circle gives the relation between normal stress and tensile stress.
2. In the τ-σ diagram for soil the positive horizontal axis gives tensile stress.
3. In the τ-σ diagram for soil the positive horizontal axis gives compressive stress.
4. The Mohr circle gives the relation between normal stress and shear stress.
5. In the τ-σ diagram for steel the positive horizontal axis gives compressive stress.
6. In the τ-σ diagram for steel the positive horizontal axis gives tensile stress.
7. In the Mohr circle real angles are shown by a factor 2.
8. In the Mohr circle real angles are shown by a factor 1/2.
16.2.2. MC: Mohr Circles 2.
Which of the following statements are true?
The bold green answers are true.
1. The Mohr circle gives the relation between normal stress and shear stress.
2. In the τ-σ diagram for soil the positive horizontal axis gives tensile stress.
3. In the τ-σ diagram for steel the positive horizontal axis gives compressive stress.
4. On the plane of a principle normal stress there is no shear stress.
5. The largest shear stress is always on a plane with an angle of 45 degrees with respect to the principal
stresses.
6. In the Mohr circle the angle between the two principal stresses is 180 degrees.
7. Mohr circles can cross the failure line/curve.
8. Tensile failure occurs on a plane with an angle of 90 degrees with the plane with the largest shear stress.
16.2.3. MC: Mohr Circles 3.
Which of the following statements are true?
The bold green answers are true.
1. The Mohr circle is based on a force equilibrium.
2. The Mohr circle is based on a stress equilibrium.
3. In the Mohr circle real angles are shown by a factor 2.
4. In the Mohr circle real angles are shown by a factor 1/2.
5. With 1 Mohr circle the angle of internal friction can be determined.
6. At least 2 (different confining pressures) Mohr circles are required to determine the angle of internal
friction.
7. Fundamentally the Mohr circle is valid in a point.
8. Fundamentally the Mohr circle is valid in an area.
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